BULLETIN NUMBER 26 TABLE OF CONTENTS PAGE SOUTHEASTERN U. S. EARTHQUAKES: JANUARY THROUGH DECEMBER 1991............ 1 Acknowledgments........................................................ 2 References............................................................. 2 SEUSSN EARTHQUAKE CATALOG STATISTICS SECTION............................. 7 HYPOCENTRAL PARAMETERS, MAGNITUDES, AND ARRIVAL TIMES FOR SOUTHEASTERN U.S. EARTHQUAKES: JANUARY THROUGH DECEMBER 1991.......... 13 HYPOCENTRAL PARAMETERS, MAGNITUDES, AND ARRIVAL TIMES FOR RESERVOIR ASSOCIATED SEISMICITY: JANUARY THROUGH DECEMBER 1991........ 43 APPENDIX A. DEFINITIONS AND OPERATOR LISTING............................ 49 APPENDIX B. SEISMIC STATIONS OPERATING DURING REPORT PERIOD............. 51 APPENDIX C. ERRATA...................................................... 57 APPENDIX D. THE MAY 1991 DAWSON COUNTY, GEORGIA, EARTHQUAKES............ 59 APPENDIX E. THE GOOCHLAND COUNTY, VIRGINIA, EARTHQUAKE ON 3/15/91....... 61 APPENDIX F. A COMPARISON OF MAGNITUDE SCALES FOR U.S. EARTHQUAKES....... 63 MAILING LIST............................................................. 77 FIGURES 1. Epicenter Map for the Report Period............................... 3 2. Epicenter Map for the Report Period (Scaled to Magnitude)......... 4 3. Epicenter Map for the Period from July 1977 through this Report Period..................................................... 5 4. Epicenter Map for the Period from July 1977 through this Report Period (Scaled to Magnitude, M ge 3.0)............................ 6 5. Focal Depth Distribution of Southeastern U.S. Earthquakes......... 8 6. Magnitude Distribution of Southeastern U.S. Earthquakes........... 9 7. Magnitude Recurrence Relation For The Southeastern U.S............ 10 8. Cumulative Strain Factor History of Southeastern U.S. Earthquakes. 11 9. Epicenter Density Contour Map (Scaled to Magnitude, M ge 2.0)..... 12 10. Seismic Stations Operating During Report Period................... 53 11. Georgia Tech - Geological Survey Of Alabama Seismic Network....... 54 12. South Carolina Seismic Network.................................... 54 13. Center for Earthquake Research and Information - SARSN............ 55 14. Tennessee Valley Authority Seismic Network........................ 55 15. Virginia Tech Seismic Network..................................... 56 TABLES 1. SEUSSN Report Period/Cumulative Earthquake Catalog Statistics..... 7 2. Estimates Of Completeness For The Southeastern U. S............... 9 SOUTHEASTERN U. S. EARTHQUAKES: JANUARY THROUGH DECEMBER 1991 There were 93 earthquakes (0.1 le M le 3.8) located within the SEUSSN monitoring area during 1991. Eleven of those, one in Alabama (17 February 17:35, MD= 2.9), one in Maryland (28 September 11:27, mb(Lg)= 2.4, MD= 1.9), five in South Carolina (15 January 22:23, MD= 1.7, MMI= II; 18 February 20:45, MD= 1.4, MMI= III; 5 March 11:46, MD= 2.0, MMI= II; 2 June 06:05, MD= 1.7, MMI= V; and 17 November 06:32, MD= 1.3, MMI= II), one in Tennessee (24 September 07:21, mb(Lg)= 3.0, MD= 3.3, MMI= IV), one in Virginia (15 March 06:54, mb(Lg)= 3.8, MD= 3.3, MMI= V), and two in West Virginia (22 April 01:01, mb(Lg)= 3.5, MD= 3.5, MMI= IV; 28 June 18:34, mb(Lg)= 3.0) were felt. Southeastern Tennessee continues to report the greatest number of earthquakes within the region. Earthquakes reported include 5 in Alabama, 11 in Georgia, 2 in Kentucky, 1 in Maryland, 3 in North Carolina, 14 in South Carolina, 45 in Tennessee, 10 in Virginia, and 2 in West Virginia. Figures 1 and 2 are epicenter maps of tectonic earthquakes (M ge 0) located within the region during the report period. Figures 3 and 4 are cumulative epicenter maps for the 14.5 year period from July 1977 through December 1991 (SEUSSN Bulletins 1 through 26). The SEUSSN earthquake statistics section includes general catalog statistics (page 7), focal depth distribution plots (page 8), magnitude distribution plots (page 9), estimates of catalog completeness (page 9), a magnitude recurrence relation (page 10), cumulative strain factor history plots (page 11), and an epicenter density contour map (page 12). The largest earthquake for the report period was an mb(Lg)= 3.8 event (15 March 06:54) that was felt with MMI= V at Goochland, Kents Store, Sandy Hook, and Troy, Virginia. This earthquake and associated tremors were the subject of a paper that appeared in Seismological Research Letters, 1991, vol. 62, pp. 225-231 (see Appendix E). Appendix D describes a swarm of small but sharply felt (maximum MMI= III) earthquakes in Dawson County, Georgia. The felt area for many of the events was four square kilometers, and a portable recorder in that area indicated that the events were very shallow. This swarm was similar to previous activity reported near Macon, Georgia, and Richmond, Virginia. Such activity may reflect an unusual earthquake habit (i.e., short-lived, shallow, but sharply felt events) that is fairly common in some areas of the southeastern U.S. Appendix F presents the results of an examination of different magnitude scales in the United States. Of particular interest are results indicating that mb(Lg), used in central and eastern North America, is nearly identical to ML, as employed in California. There were 17 reservoir induced earthquakes reported for 1991. In a special note at the beginning of the reservoir activity section, Georgia Tech reports on a swarm of 10 felt earthquakes occurring in January and February that was associated with Lake Sinclair in Georgia. The largest event in that swarm was on 15 January (MD= 3.2, MMI= V). The remaining reservoir activity was associated with Lake Monticello, Lake Jocassee, Keowee Reservoir, and Clark Hill Reservoir, all in South Carolina. The total number of stations operating during 1991 was 104 (network attrition 12%). However, by the end of the report period, five additional stations had been shut down, bringing the total network attrition to 16%. The SEUSSN monitoring area is considered to include all of Florida, Georgia, Alabama, South Carolina, North Carolina, Virginia, West Virginia (south of latitude 37.72 deg N), Maryland, and Delaware; and includes Tennessee and Kentucky - east of longitude 87 degrees West (see outlined area in the SEUSSN stations map). Acknowledgments This report is the twenty-sixth BULLETIN OF SEISMICITY OF THE SOUTHEASTERN UNITED STATES and covers the period from January through December, 1991. The organizations supplying data for this Bulletin are Charleston Southern University (formerly Baptist College at Charleston), the Delaware Geological Survey, E. I. DuPont de Nemours and Company, Inc. (Savannah River Laboratory), Georgia Institute of Technology, Memphis State University (Center for Earthquake Research and Information), the Tennessee Valley Authority, the University of South Carolina, the United States Geological Survey, the Virginia Division of Mineral Resources, Virginia Polytechnic Institute and State University (Virginia Tech Seismological Observatory), and the West Virginia Geological and Economic Survey. In addition to the support furnished by the host institutions of the network contributors, partial or full support by other agencies for the operation of portions of the SEUSSN is gratefully acknowledged. The agencies providing support to the members of SEUSSN are as follows: The Georgia Power Company, The National Science Foundation, The Nuclear Regulatory Commission, The Tennessee Valley Authority, The United States Geological Survey, Virginia Power. References Bollinger, G. A., Frederick C. Davison, Jr., Matthew S. Sibol, and Jeffrey B. Birch, (1989), Magnitude recurrence relations for the southeastern United States and its subdivisions, Journal of Geophysical Research, 94, pp. 2857-2873. Chapman, M. C., J. A. Snoke, and G. A. Bollinger, (1988), A procedure for calibrating short-period telemetered seismograph systems, Bulletin of the Seismological Society of America, 78, pp. 2077-2088. Hoaglin, David C., Frederick Mosteller, and John W. Tukey, (1983), Understanding Robust And Exploratory Data Analysis, John Wiley & Sons, New York, NY, 447 pp. Lahr, J. C., (1980), HYPOELLIPSE/VAX: A computer program for determining local earthquake hypocentral parameters, magnitude, and first-motion pattern, U.S. Geological Survey Open-File Report 80-59, 59 pp. Lee, W. H. K., and J. C. Lahr, (1974), HYPO71: A computer program for determining hypocenter, magnitude, and first motion pattern of local earthquakes, U.S. Geological Survey Open-File Report 75-311, Revised: January 1974, 134 pp. Lee, W. H. K., and S. W. Stewart, (1981), Principles And Applications of Microearthquake Networks, Academic Press, New York, NY, 293 pp. Nuttli, O. W., (1973), Seismic wave attenuation and magnitude relations for eastern North America, Journal of Geophysical Research, 78, pp. 876-885. Shedlock, Kaye M., (1987), Earthquakes recorded by the South Carolina Seismic Network (1974-1986), U.S. Geological Survey Open-File Report 87-437, 92 pp. FIGURE 1. Epicenters (Open Circles) for Earthquakes (M ge 0.0) in the Southeastern United States for this report period. FIGURE 2. Epicenters (Open Circles - Scaled to Event Magnitude) for Earthquakes (M ge 0.0) in the Southeastern United States for this report period. FIGURE 3. Epicenters (Open Circles) for Earthquakes (M ge 0.0) in the Southeastern United States from July 1977 through this report period. FIGURE 4. Epicenters (Open Circles - Scaled to Event Magnitude) for Earthquakes (M ge 3.0) in the Southeastern United States from July 1977 through this report period. SEUSSN EARTHQUAKE CATALOG STATISTICS SECTION TABLE 1 SEUSSN Report Period/Cumulative Earthquake Catalog Statistics PERIOD: January through December 1991 (1 year) Tectonic Reservoir Number of Earthquakes with M ge 0.0 .................... 93 17 Number of Earthquakes with M ge 2.5 .................... 15 7 Number of Earthquakes with M ge 3.5 .................... 2 0 Number of Felt Earthquakes.............................. 11 10 Rate of Earthquakes with M ge 0.0 (per year)............ 93 17 Rate of Earthquakes with M ge 2.5 (per year)............ 15 7.0 Rate of Earthquakes with M ge 3.5 (per year)............ 2.0 0.0 Rate of Felt Earthquakes (per year)..................... 11 10 Mean Earthquake Magnitude............................... 1.8 2.2 Median Earthquake Magnitude............................. 1.8 2.1 Number of Earthquakes with Known Dmin le 5.0 km......... 7 12 Number of Earthquakes with Known Dmin le 10.0 km........ 19 13 Number of Earthquakes with Known Dmin le 25.0 km........ 51 13 Number of Earthquakes with Known ERH le 5.0 km.......... 81 14 Number of Earthquakes with Known ERZ le 5.0 km.......... 72 0 Number of Blasts or Questionable Events Reported........ 0 Number of Events Outside the SEUSSN Area Reported....... 0 Number of Seismograph Stations Operating................ 104 Largest Earthquake.......: 15 March 1991; 06:54 - Sandy Hook, VA mb(Lg)= 3.8, MDB= 3.3, MMI= V PERIOD: July 1977 through December 1991 (14.5 years) Tectonic Reservoir Number of Earthquakes with M ge 0.0 ....................1162 681 Number of Earthquakes with M ge 2.5 .................... 201 63 Number of Earthquakes with M ge 3.5 .................... 24 2 Number of Felt Earthquakes.............................. 136 20 Rate of Earthquakes with M ge 0.0 (per year)............ 80 47 Rate of Earthquakes with M ge 2.5 (per year)............ 14 4.3 Rate of Earthquakes with M ge 3.5 (per year)............ 1.7 0.1 Rate of Felt Earthquakes (per year)..................... 9.4 1.4 Mean Earthquake Magnitude............................... 1.6 1.4 Median Earthquake Magnitude............................. 1.6 1.4 Number of Earthquakes with Known Dmin le 5.0 km......... 85 75 Number of Earthquakes with Known Dmin le 10.0 km........ 202 108 Number of Earthquakes with Known Dmin le 25.0 km........ 628 140 Number of Earthquakes with Known ERH le 5.0 km..........1030 172 Number of Earthquakes with Known ERZ le 5.0 km.......... 861 116 Number of Blasts or Questionable Events Reported........ 182 Number of Events Outside the SEUSSN Area Reported....... 12 Largest Earthquake........: 27 July 1980; 18:52 - Sharpsburg, KY mb = 5.2, MMI = VII FIGURE 5. Focal Depth Distribution of Southeastern U.S. Earthquakes. The upper half of the figure shows the interval (left) and cumulative (right) depth distributions for the current report period while the lower half of the figure is a similar display for earthquakes reported during the period from July 1977 through this report period (M ge 0.0, known ERZ le 5.0 km, Dmin le 20 km, and free depth determination). Displayed above both interval distributions is a box plot (Hoaglin and others, 1983, pp. 58-65). Indicated are the mean (star), the 25% and 75% quartile (box outline), the median (center bar), the upper and lower adjacent values (small vertical bars), and outliers (small squares). On the cumulative depth distributions arrows show the 10% and 90% depths. COMPLETENESS ESTIMATES, MAGNITUDE DISTRIBUTIONS, AND RECURRENCE RELATIONS TABLE 2 Completeness Estimates (Years) By Magnitude For The Southeastern U. S. And Subregions (Source: Bollinger and Others, 1989) MAGNITUDE 2.25 2.75 3.25 3.75 4.25 4.75 5.25 5.75 6.25 6.75 Southeastern US 6 10 15 85 145 145 215 215 215 215 Valley & Ridge and Blue Ridge 9 10 20 75 110 215 215 215 215 215 Piedmont 10 10 115 215 215 215 215 215 215 215 Coastal Plain 10 10 60 145 145 215 215 215 215 215 Giles County, VA 10 15 15 30 30 215 215 215 215 215 Central Virginia 15 60 215 215 215 215 215 215 215 215 Eastern Tennessee 5 10 10 85 115 115 215 215 215 215 Charleston, SC 10 70 70 70 130 215 215 215 215 215 FIGURE 6. Magnitude Distributions of Southeastern U. S. Earthquakes. The left half of the figure shows the interval magnitude distribution for the report period while the right half of the figure shows a similar distribution for earthquakes from July 1977 through this report period. Displayed above both distributions is a box plot (Hoaglin and others, 1983, pp. 58-65). Indicated are the mean (star), the 25% and 75% quartile (box outline), the median (center bar), the upper and lower adjacent values (small vertical bars), and outliers (small squares). FIGURE 7. Magnitude Recurrence Relation For The Southeastern U. S. The upper half of the figure shows the seismicity map with historical (circles) and network (X's) epicenters for the time period 1772-1986. The lower half of the figure shows a plot of Log(NI) (interval number of earthquakes per year, m +- 0.25) versus mb(Lg) for the southeastern U.S. The maximum likelihood line includes 95% confidence intervals (Source: Bollinger and others, 1989). FIGURE 8. Cumulative Strain Factor History of Southeastern U.S. Earthquakes. The upper half of the figure shows the cumulative strain factor history for the report period, while the lower half of the figure shows a similar plot for earthquakes from July 1977 through this report period. FIGURE 9. Epicenter Density Contour Map for Earthquakes (circles scaled to magnitude; M ge 2.0) in the Southeastern United States from July 1977 through this report period. Contours represent number of earthquakes within 50 km of a grid point scaled to number per 10,000 square km; grid spacing is 0.2 degrees. Lowest and highest contours are 5 and 20 events per 10,000 square km, respectively (contour interval is 5). HYPOCENTRAL PARAMETERS, MAGNITUDES, AND ARRIVAL TIMES FOR SOUTHEASTERN U. S. EARTHQUAKES: JANUARY THROUGH DECEMBER 1991 Events are listed chronologically (this also applies to multiple hypocenter locations for the same event). All times are Universal Time. Most entries in the listing are self-explanatory. Items that might require further explanation are defined in Appendix A. ***** 1991 JANUARY 6; 10:05 - FREDERICKSBURG, VIRGINIA ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I VTSO 910106 100539.5 38.459 77.629 23.1 9 38 317 0.3 D D/D 6.8 -53 3.7 9.6 D 1.0 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) VTSO NA2 38.3 196 iPd 10:05:46.36 (-0.29 ) eS? 10:05:51.98 ( 0.12 ) VTSO NA5 50.7 191 eP :48.50 ( 0.10 ) S? :55.79 ( 0.91 ) VTSO NA12 57.2 203 P+ :49.06 (-0.30 ) eS? :56.25 (-0.28 ) VTSO GHV 84.9 210 eP :53.73 ( 0.21 ) eS? :06:03.42 (-0.27 ) VTSO CVL 90.1 234 eP :54.63 ( 0.32 ) ***** 1991 JANUARY 6; 20:48 - KNOXVILLE, TENNESSEE ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I TVA 910106 204826.6 36.083 83.734 13.9 6 16 163 0.2 C B/C 1.2 -85 0.4 2.2 B 1.1 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) TVA CRTN 16.2 323 iP 20:48:30.20 (-0.13 ) iS 20:48:33.10 ( 0.07 ) TVA HPKT 21.8 217 eP :31.65 ( 0.58 ) iS :34.15 (-0.15 ) TVA LMTN 36.4 127 eP :33.05 (-0.25 ) eS :38.30 ( 0.14 ) ***** 1991 JANUARY 9; 07:59 - MEDA, GEORGIA ***** CERI For informational purposes only. SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 910109 075939.9 33.253 83.336 3.1 6 185 339 0.1 D D/D 72.6 -7 5.7 75.2 D 1.8 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI BBG 185.1 346 eP 08:00:10.20 (-0.03 ) eS 08:00:32.38 ( 0.01 ) CERI WSSR 225.7 354 eP :16.74 ( 0.28 ) eS :42.96 (-0.18 ) CERI RBNC 235.6 8 eP :18.06 ( 0.05 ) eS :45.16 (-0.67X) CERI ETT 252.0 336 eP :19.48 (-0.93X) eS :50.14 ( 0.16 ) Additional Data: GIT ATL P 07:59:58.0 S 08:00:07.3 ***** 1991 JANUARY 11; 21:01 - CUMBERLAND, VIRGINIA ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I VTSO 910111 210159.0 37.510 78.190 9.6 16 32 132 0.2 C B/C 0.7 -82 0.4 2.0 B 2.0 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) VTSO GHV 32.4 13 iPc 21:02:04.69 ( 0.19 ) eS 21:02:08.47 (-0.08 ) VTSO FRV 37.2 204 iPc :05.44 ( 0.17 ) eS :09.77 (-0.11 ) VTSO CVL 57.5 336 ePd :08.79 ( 0.27 ) eS :15.01 (-0.50 ) VTSO NA12 59.2 27 eP :08.77 (-0.03 ) iS :16.33 ( 0.34 ) VTSO NA5 68.5 36 ePc :10.32 ( 0.02 ) eS :18.48 (-0.11 ) VTSO NA2 78.8 30 eP :11.95 (-0.04 ) eS :21.41 (-0.09 ) VTSO PBV 82.8 135 iPd :12.47 (-0.16 ) eS :22.51 (-0.11 ) VTSO CNV 105.4 43 eP :16.48 ( 0.15 ) eS :28.79 (-0.17 ) ***** 1991 JANUARY 14; 05:06 - JEFFERSON CITY, TENNESSEE ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I TVA 910114 050630.3 36.080 83.432 10.5 17 22 104 0.2 C B/C 0.5 -18 0.3 1.2 A 1.9 CERI 910114 050630.3 36.078 83.433 11.6 16 21 103 0.1 B A/B 0.2 -27 0.2 0.6 A 1.8 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) TVA LMTN 21.5 175 eP 05:06:34.50 ( 0.03 ) eS 05:06:37.50 ( 0.00 ) TVA CRTN 39.1 290 eP :37.28 ( 0.03 ) eS :42.34 ( 0.03 ) TVA SMTN 40.4 34 eP :37.38 (-0.10 ) TVA TKL 56.0 213 eP :41.50 ( 1.47X) eS :47.10 (-0.01 ) TVA RICH 58.1 108 eP :39.82 (-0.59 ) TVA BRTN 59.3 59 eP :40.50 (-0.09 ) eS :48.15 ( 0.07 ) TVA GBTN 83.9 237 eP :44.40 (-0.14 ) eS :54.48 (-0.45 ) TVA WSSR 89.9 188 eP :45.50 (-0.05 ) TVA BRBC 110.2 110 iPd :48.76 ( 0.05 ) TVA ETT 124.7 228 eP :50.48 (-0.33 ) eS :07:05.84 ( 0.07 ) TVA BBG 138.1 195 eP :52.88 (-0.05 ) eS :10.22 ( 0.79 ) CERI LMTN 21.3 174 eP 05:06:34.50 ( 0.05 ) eS 05:06:37.50 (-0.01 ) CERI CRTN 39.1 290 eP :37.28 ( 0.05 ) eS :42.34 ( 0.02 ) CERI SMTN 40.6 34 eP :37.38 (-0.12 ) CERI TKL 55.7 214 eP :39.80 (-0.13 ) eS :47.04 ( 0.04 ) CERI RICH 58.1 107 eP :39.82 (-0.54 ) CERI BRTN 59.5 58 eP :40.50 (-0.07 ) eS :48.15 ( 0.05 ) CERI GBTN 83.8 237 eP :44.40 ( 0.02 ) eS :54.48 (-0.22 ) CERI WSSR 89.7 188 eP :45.50 ( 0.11X) CERI BRBC 110.2 110 iPd :48.76 ( 0.19 ) CERI ETT 124.5 228 eP :50.48 (-0.17 ) eS :07:05.84 ( 0.31 ) CERI BBG 137.9 195 eP :52.88 ( 0.12 ) eS :10.22 ( 1.03X) ***** 1991 JANUARY 15; 06:15 - JEFFERSON CITY, TENNESSEE ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 910115 061528.7 36.054 83.423 12.5 12 19 175 0.2 C B/C 0.7 49 0.5 1.2 A 1.7 TVA 910115 061528.8 36.055 83.423 11.5 13 19 172 0.2 C B/C 0.6 26 0.4 1.2 A 1.8 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI LMTN 18.6 176 eP 06:15:32.50 (-0.11 ) CERI CRTN 40.9 293 iP :35.90 (-0.13 ) iS 06:15:41.50 ( 0.14 ) CERI HPKT 43.5 251 eS :42.00 (-0.05 ) CERI TKL 54.1 216 eP :38.00 (-0.15 ) eS :45.24 ( 0.22 ) CERI RICH 56.5 105 eP :38.26 (-0.33X) CERI GBTN 83.1 239 eP :42.54 (-0.16 ) eS :52.68 (-0.22 ) CERI WSSR 87.2 189 eP :43.72 ( 0.30 ) CERI BRBC 108.5 108 iPd :46.92 ( 0.19 ) CERI ETT 123.5 229 eP :48.98 ( 0.08 ) eS :16:04.12 ( 0.50X) CERI BBG 135.5 195 eP :51.44 ( 0.62 ) eS :08.40 ( 1.46X) TVA LMTN 18.7 176 eP 06:15:32.50 (-0.10 ) TVA CRTN 40.9 293 iP :35.90 (-0.15 ) iS 06:15:41.50 ( 0.15 ) TVA HPKT 43.6 251 eP eS :42.00 (-0.07 ) TVA TKL 54.3 216 eP eS :45.24 ( 0.13 ) TVA RICH 56.5 105 eP :38.26 (-0.37 ) TVA GBTN 83.2 239 eP :42.54 (-0.29 ) eS :52.68 (-0.40 ) TVA WSSR 87.3 189 eP :43.72 ( 0.17 ) TVA BRBC 108.4 109 iPd :46.92 ( 0.08 ) TVA ETT 123.6 229 eP :48.98 (-0.05 ) eS :16:04.12 ( 0.31 ) TVA BBG 135.7 195 eP :51.44 ( 0.49 ) eS :08.40 ( 1.26X) ***** 1991 JANUARY 15; 21:03 - JOHN SEVIER, TENNESSEE ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 910115 210345.9 36.074 83.804 13.0 29 14 90 0.2 B B/B 0.3 -61 0.3 0.5 A 2.5 TVA 910115 210346.0 36.077 83.803 11.8 11 14 90 0.1 B B/B 0.4 -81 0.3 1.5 B 2.6 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI CRTN 14.4 347 iP 21:03:49.10 (-0.20 ) CERI HPKT 17.7 202 iP :49.70 (-0.01 ) eS 21:03:52.00 (-0.46X) CERI LMTN 41.2 120 iP :53.29 (-0.02 ) eS :58.60 (-0.10 ) CERI TKL 46.1 177 eP+ :54.06 (-0.03 ) iS :59.92 (-0.12 ) CERI ORT 48.7 248 iP :54.64 ( 0.14 ) eS :04:00.70 (-0.05 ) CERI GBTN 58.2 219 eP+ :56.04 (-0.01 ) eS :03.30 (-0.12 ) CERI CCVA 60.0 12 eS :03.92 (-0.03 ) CERI SMTN 65.6 58 eP :57.18 (-0.05 ) CERI WSSR 90.6 167 eP+ :04:01.24 ( 0.12 ) CERI ETT 101.7 216 eP- :03.02 ( 0.27 ) eS :15.06 ( 0.04 ) CERI TQTN 103.8 234 eP :03.75 ( 0.72 ) eS :16.30 ( 0.80X) CERI BHT 105.9 257 eP :02.72 (-0.69 ) CERI BBG 133.1 180 eP :08.32 ( 0.70 ) eS :23.94 ( 0.49 ) CERI WMTN 140.0 229 iP :09.20 ( 0.62 ) eS :25.69 ( 0.58 ) CERI BRBC 142.0 105 eP+ :09.44 ( 0.40 ) eS :26.26 ( 0.36 ) CERI GMG 155.6 211 eP :11.94 ( 0.89 ) eS :30.32 ( 0.94 ) CERI TRYN 167.1 122 eP :13.82 ( 1.03 ) CERI GFM 179.9 88 eP :16.22 ( 1.40 ) eS :36.72 ( 0.81 ) CERI RCG 185.6 229 eP :16.50 ( 0.92 ) CERI PDTN 205.3 245 iP :19.30 ( 0.71X) iS :44.50 ( 2.07X) CERI ABTN 208.9 265 eP :20.00 ( 0.86X) eS :44.50 ( 1.13X) CERI LKGA 221.1 224 iP :21.50 ( 0.47X) iS :48.50 ( 1.86X) CERI PKNC 238.5 90 eP :24.60 ( 0.89X) eS :52.42 ( 1.14X) CERI HAKY 273.9 296 eP :29.60 ( 1.61X) eS :05:01.40 ( 2.72X) TVA CRTN 14.1 346 iP 21:03:49.10 (-0.05 ) TVA HPKT 18.1 202 iP :49.70 ( 0.02 ) eS 21:03:52.00 (-0.40X) TVA LMTN 41.2 121 iP :53.29 ( 0.00 ) eS :58.60 (-0.05 ) TVA TKL 46.6 177 iP :54.20 ( 0.07 ) iS :04:00.00 (-0.10 ) TVA ORT 48.9 248 iP :54.64 ( 0.12 ) eS :00.70 (-0.07 ) TVA GBTN 58.6 219 ePc :56.04 (-0.06X) eS :03.30 (-0.21X) TVA CCVA 59.6 12 eS :03.92 ( 0.09 ) TVA SMTN 65.3 59 eP :57.18 (-0.04 ) TVA WSSR 90.9 167 eP+ :04:01.24 (-0.01X) TVA ETT 102.1 216 eP- :03.02 ( 0.12X) eS :15.06 (-0.20X) TVA TQTN 104.1 234 eP :03.75 ( 0.58X) eS :16.30 ( 0.56X) TVA BHT 106.2 256 eP :02.72 (-0.82 ) TVA BBG 133.5 180 eP :08.32 ( 0.55X) eS :23.94 ( 0.25X) TVA WMTN 140.3 229 iP :09.20 ( 0.47X) eS :25.69 ( 0.34X) TVA BRBC 142.0 105 ePc :09.44 ( 0.32X) eS :26.26 ( 0.23X) TVA GMG 156.0 211 eP :11.94 ( 0.74X) eS :30.32 ( 0.69X) TVA TRYN 167.2 122 eP :13.82 ( 0.93X) TVA GFM 179.8 88 eP :16.22 ( 1.33X) eS :36.72 ( 0.71X) TVA RCG 186.0 229 eP :16.50 ( 0.77X) TVA PDTN 205.6 245 iP :19.30 ( 0.58X) iS :44.50 ( 1.85X) TVA ABTN 209.1 265 eP :20.00 ( 0.75X) eS :44.50 ( 0.93X) TVA LKGA 221.4 224 iP :21.50 ( 0.33X) iS :48.50 ( 1.62X) TVA PKNC 238.3 90 eP :24.60 ( 1.30X) eS :52.42 ( 1.86X) TVA HAKY 273.9 295 eP :29.60 ( 2.04X) eS :05:01.40 ( 3.46X) ***** 1991 JANUARY 15; 22:23 - MIDDLETON PLACE, SOUTH CAROLINA ***** CSU Felt (II) between Middleton Place and Summerville. Magnitude 1.67. USGS NOTE: Fault Plane Solution (strike, dip, rake) Nodal Plane: 135.0 65.0 50.0 Nodal Plane: 18.3 46.0 144.0 P Axis: 252.6 78.9 T Axis: 357.2 37.8 NEIC Felt. SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I USC 910115 222333.5 32.948 80.131 4.5 7 6 131 0.0 0.6 360 0.6 2.1 1.7 USGS 910115 222333.7 32.953 80.146 2.0 20 6 0.2 0.7 90 0.7 3.2 1.7 NEIC 910115 222333.7 32.953 80.146 2.0 11 7 1.7 F SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC MGS 5.6 190 iPc 22:23:35.07 (-0.02 ) USC BCS 7.1 59 iPd :35.46 (-0.01 ) USC RGR 7.4 233 iPd :35.36 ( 0.05 ) USC SVS 11.2 283 iPd :35.98 (-0.02 ) USC WAS 17.2 230 iPd :36.97 ( 0.01 ) USC TWB 18.8 8 iPc :37.34 ( 0.02 ) USC HBF 18.8 271 iPd :37.18 (-0.02 ) USC HWD 27.2 212 iP+ :38.62 (-0.06X) USC CFS 36.9 355 ePu :40.60 ( 0.23X) USC SGS 44.6 308 ePc :41.83 ( 0.13X) USC COW 71.7 313 eP- :55.00 ( 8.93X) USC VRN 76.1 278 ePd :46.56 (-0.21X) USC MTT 166.7 303 eP+ :56.38 (-3.83X) USC LHS 181.3 340 eP+ :24:01.52 (-0.31X) USC JSC 182.0 325 eP+ :02.64 ( 0.73X) USGS MGS 6.2 175 iPc 22:23:35.11 (-0.09 ) S 22:23:36.47 ( 0.09 ) USGS RGR 6.9 220 iPd :35.34 ( 0.07 ) S :36.25 (-0.07 ) USGS BCS 8.5 68 iPd :35.45 (-0.07 ) S :36.39 (-0.23 ) USGS SVS 9.8 280 eP- :36.01 ( 0.16 ) S :37.30 (-0.06 ) USGS WAS 16.6 225 iPd :36.69 (-0.19 ) S :39.41 ( 0.14 ) USGS TWB 18.4 12 eP+ :37.32 ( 0.11 ) S :39.01 (-0.31 ) USGS HBF 21.8 264 eP- :37.19 (-0.23 ) S :39.32 (-0.27 ) USGS CFS 36.2 356 eP+ :40.56 ( 0.24 ) S :43.72 (-0.35 ) USGS SGS 43.3 307 P :41.80 ( 0.12 ) USGS VRN 74.9 277 P :46.57 (-0.09 ) USGS JSC 179.4 325 eP+ :24:02.36 ( 0.06 ) S :24:24.55 ( 0.54 ) NEIC MGS 6.7 176 iPc 22:23:35.11 ( 0.1 ) eS 22:23:36.47 ( X) NEIC RGRS 6.7 220 iPd :35.34 ( 0.3 ) eS :36.25 ( X) NEIC BCS 8.9 69 iPd :35.45 ( 0.1 ) eS :36.39 ( X) NEIC SVS 10.0 280 eP :36.01 ( 0.5 ) NEIC WSS 16.7 225 iPd :36.69 ( 0.0 ) eS :39.41 ( X) NEIC TWB 18.9 13 eP :37.32 ( 0.3 ) eS :39.01 ( X) NEIC HBF 22.2 264 eP :37.19 (-0.4 ) eS :39.32 ( X) NEIC CFS 36.7 357 eP :40.56 ( 0.3 ) eS :43.72 ( X) NEIC SGS 43.4 308 eP :41.80 ( 0.3 ) NEIC VRN 74.5 277 eP :46.57 (-0.6 ) NEIC JSC 180.1 325 eP :24:02.36 (-0.9 ) eS :24:24.55 ( X) ***** 1991 JANUARY 16; 18:22 - JEFFERSON CITY, TENNESSEE ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I TVA 910116 182214.7 36.075 83.429 3.2 12 40 59 0.1 C B/C 0.7 -8 0.3 1.6 B 2.0 CERI 910116 182214.8 36.075 83.423 6.3 20 40 102 0.1 C B/C 0.3 -35 0.2 1.4 B 2.0 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) TVA LMTN 21.0 175 eP 18:22:19.10 ( 0.62X) TVA CRTN 39.6 291 iP :21.80 ( 0.05 ) iS 18:22:26.80 (-0.10 ) TVA SMTN 40.6 33 eP- :21.94 ( 0.00 ) eS :28.16 ( 0.93X) TVA HPKT 43.8 248 iP :22.60 ( 0.11 ) eS :28.20 ( 0.02 ) TVA TKL 55.8 214 eP :24.32 (-0.15 ) iS :31.64 ( 0.03 ) TVA RICH 57.7 107 eP :24.46 (-0.36 ) TVA CCVA 62.3 340 eP :25.94 ( 0.38X) eS :33.44 (-0.06 ) TVA GBTN 84.0 237 iPc :29.02 (-0.10X) eS :39.14 (-0.51X) TVA WSSR 89.5 189 eP+ :29.96 (-0.14 ) TVA BRBC 109.7 110 iPd :33.38 (-0.15X) eS :54.02 ( 6.75X) TVA ETT 124.6 228 eP :35.36 (-0.33X) eS :50.44 (-0.58X) TVA BBG 137.7 195 eP :37.58 (-0.18X) eS :54.30 (-0.30X) TVA TRYN 139.7 130 eP- :38.28 ( 0.26 ) TVA GFM 146.1 88 eP :39.26 ( 0.18 ) eS :54.42 (-2.46X) TVA WMTN 167.3 237 eP :42.80 ( 0.60X) eS :23:02.60 ( 0.33X) TVA GMG 175.5 220 eP :43.24 (-0.28X) eS :05.46 ( 0.90X) TVA PKNC 204.6 90 eP :48.42 ( 0.46X) eS :12.30 ( 0.06X) TVA RCG 212.6 236 eP :49.28 ( 0.13X) eS :15.80 ( 1.50X) TVA PLVA 213.9 71 eP :49.98 ( 0.56X) eS :14.88 ( 0.11X) TVA ABTN 242.6 266 iP :54.50 ( 0.99X) eS :24.00 ( 2.16X) TVA LKGA 245.8 230 eP :54.40 ( 0.46X) eS :25.10 ( 2.51X) CERI LMTN 20.9 177 eP 18:22:19.10 ( 0.45X) CERI CRTN 40.1 290 iP :21.80 ( 0.01 ) iS 18:22:26.80 (-0.10 ) CERI SMTN 40.3 32 eP- :21.94 ( 0.09 ) eS :28.16 ( 1.14X) CERI HPKT 44.3 248 iP :22.60 ( 0.11 ) eS :28.20 ( 0.07 ) CERI TKL 56.0 215 eP :24.32 (-0.11 ) eS :31.64 ( 0.16 ) CERI RICH 57.2 107 eP :24.46 (-0.20 ) CERI CCVA 62.5 340 eP :25.94 ( 0.43X) eS :33.44 ( 0.10 ) CERI GBTN 84.4 238 iPc :29.02 (-0.10 ) eS :39.14 (-0.45X) CERI WSSR 89.6 189 eP+ :29.96 (-0.08 ) CERI BRBC 109.2 110 iPd :33.38 ( 0.11 ) eS :54.02 ( 7.24X) CERI ETT 125.0 229 eP :35.36 (-0.21 ) eS :50.44 (-0.31 ) CERI BBG 137.8 195 eP :37.58 (-0.02 ) eS :54.30 ( 0.03 ) CERI TRYN 139.3 130 eP- :38.28 ( 0.50 ) CERI GFM 145.6 88 eP :39.26 ( 0.44 ) eS :54.42 (-1.96X) CERI WMTN 167.7 237 eP :42.80 ( 0.71X) eS :23:02.60 ( 0.57 ) CERI GMG 175.8 220 eP :43.24 (-0.16 ) eS :05.46 ( 1.17X) CERI PKNC 204.1 90 eP :48.42 ( 0.72X) eS :12.30 ( 0.56X) CERI RCG 213.0 236 eP :49.28 ( 0.24X) eS :15.80 ( 1.75X) CERI PLVA 213.4 71 eP :49.98 ( 0.81X) eS :14.88 ( 0.61X) CERI ABTN 243.2 266 iP :54.50 ( 0.86X) eS :24.00 ( 1.99X) CERI LKGA 246.2 230 eP :54.40 ( 0.26X) eS :25.10 ( 2.22X) ***** 1991 JANUARY 21; 01:40 - JOHN SEVIER, TENNESSEE ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 910121 014057.3 36.077 83.795 10.0 10 14 221 0.3 D C/D 2.5 -87 0.7 2.3 B 1.3 TVA 910121 014057.5 36.085 83.848 10.0 10 13 169 0.3 C B/C 1.3 -89 0.3 1.1 A 0.7 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI CRTN 14.3 343 iP 01:41:00.06 (-0.32 ) iS 01:41:02.90 ( 0.30 ) CERI HPKT 18.4 204 eP :01.00 ( 0.04 ) iS :03.50 (-0.10 ) CERI TKL 46.4 178 eS :11.48 ( 0.10 ) CERI GBTN 59.1 220 eP :08.02 ( 0.49 ) eS :14.90 (-0.06 ) CERI WSSR 90.8 167 eS :24.04 ( 0.07X) CERI ETT 102.5 216 eP :14.98 ( 0.52 ) eS :26.58 (-0.38 ) CERI BBG 133.5 181 eS :35.70 ( 0.43 ) TVA CRTN 12.7 3 iP 01:41:00.06 (-0.33 ) iS 01:41:02.90 ( 0.44 ) TVA HPKT 17.9 189 eP :01.00 (-0.10 ) iS :03.50 (-0.19 ) TVA TKL 47.8 172 eP :00.00 (-5.90X) iS :12.10 ( 0.11 ) TVA GBTN 56.9 215 eP :08.02 ( 0.64 ) eS :14.90 ( 0.34 ) TVA WSSR 92.8 165 eS :24.04 (-0.67X) TVA ETT 100.6 213 eP :14.98 ( 0.60 ) eS :26.58 (-0.08 ) TVA BBG 134.4 179 eS :35.70 (-0.04 ) ***** 1991 JANUARY 21; 07:03 - GUNTERSVILLE DAM, ALABAMA ***** CERI For informational purposes only. SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 910121 070323.7 34.490 86.397 12.2 20 47 206 0.2 C B/D 0.9 -22 0.3 1.0 A 2.0 TVA 910121 070323.7 34.486 86.404 11.0 15 47 210 0.3 D C/D 1.2 -22 0.4 1.3 A 1.9 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI MSAL 47.0 328 eP 07:03:32.08 ( 0.10 ) eS 07:03:37.81 (-0.20 ) CERI LKGA 86.2 80 eS :45.00 (-3.78X) CERI LAL 86.6 266 eP :37.98 (-0.25 ) iS :48.80 (-0.02 ) CERI PDTN 100.3 30 eP :40.20 (-0.14 ) eS :52.21 (-0.27 ) CERI RCG 110.2 60 eP :41.72 (-0.14 ) eS :55.34 ( 0.24 ) CERI WMTN 155.0 57 eP :48.84 ( 0.12 ) eS :04:08.06 ( 1.08 ) CERI ABTN 157.1 10 eP :49.00 (-0.04 ) eS :07.70 ( 0.18 ) CERI PWLA 162.0 290 eP :50.22 ( 0.44 ) eS :09.48 ( 0.68 ) CERI TQTN 190.4 53 eS :15.86 (-0.46 ) CERI TCT 198.3 328 eP :55.40 ( 0.06 ) eS :19.10 ( 0.67 ) CERI ANTN 214.6 29 eP :57.54 (-0.33 ) eS :23.91 ( 1.11 ) CERI GBTN 238.3 56 eS :29.38 ( 0.34X) CERI BBG 240.8 79 eS :30.20 ( 0.28 ) CERI MOTN 276.7 329 eP :04:01.00 (-5.21X) eS :39.80 ( 2.57X) CERI CRTN 300.0 50 eP :10.80 ( 1.69X) eS :46.44 ( 4.19X) TVA MSAL 47.1 328 eP 07:03:32.08 ( 0.15 ) eS 07:03:37.81 (-0.14 ) TVA LAL 85.9 267 eP :37.98 (-0.21 ) iS :48.80 ( 0.03 ) TVA LKGA 86.9 80 eP eS :45.00 (-4.07X) TVA PDTN 101.0 30 eP :40.20 (-0.30 ) eS :52.21 (-0.56 ) TVA WMTN 155.8 57 eP :48.84 (-0.05 ) eS :04:08.06 ( 0.78 ) TVA ABTN 157.6 10 eP :49.00 (-0.17 ) eS :07.70 (-0.07 ) TVA TQTN 191.1 53 eP eS :15.86 (-0.77 ) TVA TCT 198.4 329 eP :55.40 (-0.01 ) eS :19.10 ( 0.54 ) TVA ANTN 215.3 29 eP :57.54 (-0.49 ) eS :23.91 ( 0.82 ) TVA MOTN 276.7 329 eP :04:01.00 (-4.75X) eS :39.80 ( 3.35X) TVA CRTN 300.8 50 eP :10.80 ( 2.07X) eS :46.44 ( 4.84X) ***** 1991 JANUARY 26; 14:02 - WHITLEY CITY, KENTUCKY ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 910126 140217.3 36.714 84.403 2.4 6 108 350 0.0 D C/D 6.6 -21 0.4 10.9 D 1.6 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI BHT 107.8 207 eS 14:02:49.22 (-0.01 ) CERI GBTN 117.5 171 eP 14:02:37.22 (-0.03 ) eS :51.82 ( 0.00 ) CERI TKL 130.1 154 eP :39.40 ( 0.23X) eS :55.14 ( 0.00 ) CERI ETT 154.1 182 eP :43.62 ( 0.75 ) eS :03:01.64 ( 0.10 ) CERI BBG 211.0 165 eS :17.42 ( 0.67X) ***** 1991 JANUARY 27; 20:35 - LEESBURG, TENNESSEE ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I TVA 910127 203541.0 36.391 82.544 19.5 5 29 179 0.0 D D/D 7.4 -10 0.5 4.0 D 1.8 CERI 910127 203541.7 36.362 82.530 4.1 14 30 164 0.5 D D/C 2.8 -20 1.6 6.6 D 2.3 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) TVA BRTN 29.4 263 iP 20:35:46.90 ( 0.04 ) eS 20:35:51.12 (-0.04 ) TVA SLTN 38.4 81 iP :48.20 ( 0.00 ) eS :53.47 (-0.01 ) TVA LMTN 96.0 235 eP :56.71 (-0.12 ) eS :36:10.20 ( 1.80X) TVA CRTN 118.4 260 eP :36:01.64 ( 1.39X) eS :22.02 ( 7.70X) TVA WMTN 253.6 241 eS :52.08 ( 4.69X) CERI BRTN 30.4 269 iP 20:35:46.90 (-0.24 ) eS 20:35:51.12 ( 0.00 ) CERI SLTN 37.8 76 iP :48.20 (-0.21 ) eS :53.47 ( 0.15 ) CERI SMTN 58.6 272 eP :53.28 ( 1.39 ) CERI GFM 70.7 113 eP :54.76 ( 0.81 ) eS :36:02.56 (-0.35 ) CERI LMTN 95.2 237 eP :56.71 (-1.22 ) eS :10.20 ( 0.41X) CERI CRTN 119.2 262 eP :36:01.64 (-0.11X) eS :22.02 ( 5.61X) CERI TRYN 124.2 168 eP :03.80 ( 1.24 ) CERI TKL 136.7 236 eP :06.38 ( 1.96 ) CERI WSSR 153.1 219 eP :08.18 ( 1.15 ) CERI GBTN 170.1 243 eP :10.94 ( 1.40 ) CERI BBG 201.8 215 eP :15.74 ( 1.25 ) CERI ETT 208.5 237 eP :16.48 ( 1.04 ) CERI WMTN 253.1 241 eS :52.08 ( 0.20X) ***** 1991 FEBRUARY 7; 08:45 - MIDDLETON PLACE, SOUTH CAROLINA ***** CSU Magnitude 1.89. USGS NOTE: Fault Plane Solution (strike, dip, rake) Nodal Plane: 160.0 30.0 120.0 Nodal Plane: -53.7 64.3 73.9 P Axis: 48.2 72.2 T Axis: 186.6 23.3 SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I USC 910207 084527.3 32.937 80.128 7.7 6 5 146 0.0 1.5 360 1.5 3.2 1.4 USGS 910207 084527.6 32.939 80.150 6.2 12 5 0.1 1.5 0 0.9 3.3 1.3 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC MGS 4.5 196 iPd 08:45:29.12 ( 0.01 ) USC RGR 6.9 243 iPd :29.32 (-0.01 ) USC BCS 7.6 50 iPd :29.60 ( 0.00 ) USC SVS 11.7 288 iPd :30.07 ( 0.01 ) USC WAS 16.7 234 iPd :30.93 ( 0.16X) USC HBF 19.1 274 iPd :31.14 ( 0.01 ) USC TWB 19.9 6 iPd :31.39 ( 0.00 ) USC SGS 45.5 309 iPd :37.46 ( 1.91X) USGS MGS 4.7 169 iPd 08:45:29.10 (-0.05 ) S 08:45:30.61 ( 0.12 ) USGS RGR 5.5 227 iPd :29.35 ( 0.16 ) S :30.05 (-0.15 ) USGS BCS 9.5 60 iPd :29.65 (-0.08 ) S :30.30 (-0.49 ) USGS SVS 9.8 289 eP- :30.10 ( 0.19 ) S :31.34 (-0.12 ) USGS TWB 20.0 12 iPd :31.37 (-0.03 ) S :34.38 ( 0.11 ) USGS HBF 21.3 268 eP- :31.20 (-0.06 ) S :33.33 (-0.18 ) ***** 1991 FEBRUARY 17; 17:35 - GIBSONVILLE, ALABAMA ***** GIT Felt, Randolph County, Alabama. CERI For informational purposes only. SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 910217 173513.9 33.140 85.772 0.5 8 138 239 0.1 D D/D 6.3 46 0.9 6.0 D 2.9 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI ATL 137.5 76 eP 17:35:37.00 (-0.03 ) eS 17:35:53.40 (-0.55X) CERI CDG 192.3 32 eP :45.40 (-0.04 ) eS :36:06.80 (-1.69X) CERI RCG 207.3 11 eP :47.64 (-0.10 ) eS :10.50 (-1.97X) CERI GMG 216.5 28 eP :49.32 ( 0.12 ) eS :12.50 (-2.51X) CERI BBG 264.2 43 eP :57.90 ( 1.53X) eS :24.72 (-2.68X) CERI ETT 271.1 26 eP :57.14 ( 0.02 ) eS :26.26 (-2.44X) CERI PWLA 294.0 315 eP :36:01.84 ( 1.97 ) eS :33.16 (-0.30X) CERI BHT 309.8 14 eS :38.66 ( 1.74X) CERI WSSR 311.6 40 eP :02.62 ( 0.45 ) eS :37.72 ( 0.28X) CERI GBTN 314.8 27 eP :03.50 ( 1.07 ) eS :37.74 (-0.15X) CERI TKL 334.4 33 eP :06.56 ( 1.74X) eS :41.82 (-0.20X) Additional Data: GIT ATL P 17:35:37.7 S 17:35:53.4 GIT CDG P :48.5 S :36:06.9 ***** 1991 FEBRUARY 18; 20:45 - MIDDLETON PLACE, SOUTH CAROLINA ***** CSU Felt (III) between Middleton Place and Summerville. Magnitude 2.08. USGS NOTE: Fault Plane Solution (strike, dip, rake) Nodal Plane: 95.0 30.0 -30.0 Nodal Plane: 211.6 75.5 -116.6 P Axis: 90.6 37.9 T Axis: -37.9 64.2 SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I USC 910218 204510.5 32.956 80.171 6.2 8 6 82 0.0 0.3 360 0.3 1.4 1.6 USGS 910218 204510.7 32.962 80.179 4.1 18 6 0.2 0.8 0 0.7 1.6 1.4 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC RGR 5.8 202 iPc 20:45:12.23 ( 0.02 ) USC MGS 7.0 156 iPc :12.42 ( 0.00 ) USC SVS 7.3 282 iPd :12.46 (-0.03 ) USC BCS 10.2 74 iPc :13.03 ( 0.00 ) USC HBF 15.1 267 iPd :13.63 (-0.03 ) USC WAS 15.3 218 iPd :13.64 (-0.02 ) USC TWB 18.8 19 ePc :14.34 ( 0.00 ) USC SGS 41.1 310 iPc :18.07 (-0.01 ) USC LHS 179.2 341 eP+ :38.27 (-0.05X) USGS RGR 6.4 192 iPc 20:45:12.19 (-0.02 ) S 20:45:12.98 (-0.17 ) USGS SVS 6.6 276 iPd :12.47 ( 0.15 ) S :13.37 (-0.10 ) USGS MGS 8.1 153 iPc :12.41 (-0.11 ) USGS BCS 11.2 79 iPc :13.01 ( 0.04 ) S :14.26 (-0.18 ) USGS WAS 15.4 214 iPd :13.68 ( 0.03 ) S :16.20 ( 0.21 ) USGS TWB 18.4 22 iPc :14.31 ( 0.14 ) S :16.39 (-0.11 ) USGS HBF 18.9 260 iPd :13.62 (-0.27 ) USGS SGS 40.3 309 eP+ :17.98 (-0.01 ) S :22.25 (-0.34 ) USGS VRN 71.8 276 eP+ :24.50 ( 1.19 ) S :31.35 (-0.10 ) USGS JSC 176.8 325 eP+ :39.07 ( 0.35 ) USGS LHS 178.0 340 eP+ :38.28 (-0.39 ) ***** 1991 FEBRUARY 19; 01:15 - MT. VERNON, TENNESSEE ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 910219 011515.4 35.499 84.315 16.0 7 21 173 0.0 B A/C 0.4 -55 0.1 0.8 A 1.1 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI GBTN 20.9 27 iPc 01:15:19.86 ( 0.03 ) iS 01:15:23.06 (-0.03 ) CERI ETT 23.0 214 eP+ :20.14 (-0.01 ) eS :23.66 ( 0.02 ) CERI TKL 52.2 70 eP :24.42 (-0.05 ) eS :31.16 ( 0.05 ) CERI WSSR 71.3 110 eP :27.78 ( 0.29X) eS :36.32 (-0.01 ) ***** 1991 FEBRUARY 19; 14:00 - VONORE, TENNESSEE ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I TVA 910219 140001.4 35.616 84.246 12.8 17 6 83 0.2 B B/A 0.4 -48 0.2 0.4 A 1.8 CERI 910219 140001.4 35.613 84.249 12.5 8 7 180 0.1 C B/D 0.8 -37 0.2 0.8 A 1.9 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) TVA GBTN 6.4 30 iPc 14:00:03.88 ( 0.00 ) eS 14:00:05.64 (-0.06 ) TVA ORT 33.0 351 iP :07.49 ( 0.06 ) iS :11.45 (-0.39 ) TVA ETT 37.4 211 eP+ :08.00 (-0.15 ) eS :12.92 (-0.16 ) TVA TKL 43.0 84 eP :08.98 (-0.04 ) eS :14.68 ( 0.08 ) TVA TQTN 44.9 256 eP :09.80 ( 0.48 ) eS :15.20 ( 0.08 ) TVA WSSR 71.3 122 eP :13.82 ( 0.21 ) eS :22.56 ( 0.02 ) TVA CRTN 74.4 29 iP :14.20 ( 0.20 ) iS :23.10 (-0.12 ) TVA GMG 92.1 205 eP :16.40 (-0.38 ) eS :27.68 (-0.33 ) TVA ABTN 171.1 281 eP :32.00 ( 3.19X) eS :48.40 (-0.44 ) CERI GBTN 6.8 31 iPc 14:00:03.88 ( 0.03 ) eS 14:00:05.64 (-0.02 ) CERI ETT 36.9 210 eP+ :08.00 (-0.04 ) eS :12.92 ( 0.01 ) CERI TKL 43.3 83 eP :08.98 (-0.07 ) eS :14.68 ( 0.03 ) CERI WSSR 71.4 121 eP :13.82 ( 0.19 ) eS :22.56 (-0.03 ) CERI GMG 91.7 205 eP :16.40 (-0.31X) eS :27.68 (-0.23X) ***** 1991 MARCH 5; 11:46 - SUMMERVILLE, SOUTH CAROLINA ***** CSU Felt (II) between Jedburg and Summerville. Magnitude 1.79. USGS NOTE: Fault Plane Solution (strike, dip, rake) Nodal Plane: 120.0 50.0 -20.0 Nodal Plane: 223.2 74.8 -138.2 P Axis: 89.8 50.2 T Axis: -13.6 74.4 SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I USGS 910305 114611.7 33.038 80.172 0.9 19 11 0.2 0.6 0 0.6 1.3 2.0 USC 910305 114611.7 33.046 80.159 2.2 7 9 97 0.0 0.4 360 0.4 2.5 1.7 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USGS SVS 10.5 222 iPd 11:46:14.24 ( 0.13 ) S 11:46:14.80 (-0.57 ) USGS TWB 10.7 37 iPd :13.75 (-0.27 ) S :15.68 (-0.04 ) USGS BCS 12.1 121 iPd :14.23 (-0.06 ) S :16.28 ( 0.04 ) USGS RGR 14.8 187 iPd :14.83 ( 0.08 ) S :16.68 (-0.14 ) USGS MGS 15.9 169 iPd :15.03 ( 0.04 ) S :17.83 ( 0.23 ) USGS DRC 21.7 290 iPc :16.23 ( 0.19 ) S :19.12 ( 0.03 ) USGS HBF 22.5 238 iPd :15.37 (-0.30 ) S :17.90 (-0.23 ) USGS WAS 23.1 203 eP+ :19.52 ( 2.91 ) USGS SGS 36.1 298 eP- :18.48 ( 0.01 ) USGS VRN 71.9 269 iPc :24.25 (-0.11 ) S :32.93 (-0.06 ) USGS JCS 170.3 323 eP+ :39.80 ( 0.40 ) USC TWB 9.3 33 iPd 11:46:13.77 ( 0.01 ) USC BCS 11.4 130 iPd :14.23 (-0.01 ) USC SVS 12.0 225 iPd :14.23 ( 0.00 ) USC RGR 15.7 193 iPd :14.80 (-0.03 ) USC MGS 16.5 174 iPd :15.06 ( 0.04 ) USC HBF 19.6 237 iPd :15.34 (-0.14X) USC DRC 22.5 288 iPc :16.23 ( 0.12 ) USC SGS 36.6 297 iPd :18.48 ( 0.00 ) USC VRN 72.8 270 iPc :24.34 (-0.27X) USC JSC 171.6 324 eP+ :39.85 ( 0.77X) ***** 1991 MARCH 7; 03:44 - AUSMUS, TENNESSEE ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 910307 034458.0 36.419 83.767 18.6 23 22 100 0.2 B B/B 0.6 -43 0.4 1.4 B 2.6 TVA 910307 034458.1 36.419 83.760 17.6 37 22 99 0.3 B B/B 0.4 -14 0.3 1.0 A 2.4 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI CCVA 22.3 24 eP 03:45:02.84 (-0.05 ) eS 03:45:06.60 ( 0.14 ) CERI CRTN 25.2 195 iP :03.50 ( 0.26 ) eS :06.50 (-0.57 ) CERI SMTN 52.6 94 iP- :07.26 ( 0.01 ) eS :13.90 (-0.10 ) CERI LMTN 67.2 151 eP :09.30 (-0.15 ) eS :16.40 (-1.41X) CERI BRTN 81.0 95 iP :11.35 (-0.20 ) iS :21.60 ( 0.15 ) CERI TKL 84.3 180 eP+ :11.94 (-0.10 ) eS :22.44 ( 0.16 ) CERI GBTN 92.6 206 eP- :13.32 ( 0.03 ) eS :24.84 ( 0.38X) CERI RICH 101.7 123 eP :14.58 (-0.17 ) eS :27.20 ( 0.22 ) CERI BHT 123.5 239 eP :14.78 (-3.29X) eS :33.74 ( 1.01X) CERI WSSR 127.7 172 eP :18.86 ( 0.10 ) eS :34.80 ( 0.88X) CERI TQTN 132.3 221 eS :36.90 ( 1.94X) CERI ANTN 134.3 259 iP :19.25 (-0.46 ) eS :35.80 ( 0.24 ) CERI ETT 136.2 207 eP :19.80 (-0.19 ) eS :36.72 ( 0.68X) CERI RBNC 137.3 149 eP :20.42 ( 0.15 ) eS :37.24 ( 0.72X) CERI BRBC 153.2 119 eP :23.84 ( 1.12X) eS :40.84 ( 0.07X) CERI BBG 171.4 181 eP :25.42 (-0.03 ) eS :46.04 ( 0.56 ) CERI GFM 179.4 100 eP :26.58 (-0.12 ) eS :47.78 ( 0.12X) CERI FDKY 186.0 283 eP :28.20 ( 0.62 ) eS :50.30 ( 1.12X) CERI TRYN 187.6 132 eP :26.98 (-0.91X) eS :50.80 ( 1.09X) CERI GMG 191.0 206 eP :28.90 ( 0.48X) eS :51.80 ( 1.17X) CERI BENN 212.2 116 eP :31.80 ( 0.15X) eS :57.12 ( 0.91X) CERI RCG 214.7 222 eP :33.02 ( 1.02X) eS :59.62 ( 2.80X) CERI ABTN 218.9 255 eP :32.38 (-0.24X) eS :59.00 ( 1.10X) CERI PLVA 235.0 83 eP :34.38 (-0.54X) eS :46:00.34 (-1.54X) CERI LKGA 252.1 218 eS :09.00 ( 3.66X) CERI HAKY 262.9 288 eS :09.60 ( 2.13X) TVA CCVA 22.1 22 eP 03:45:02.84 (-0.04 ) eS 03:45:06.60 ( 0.23 ) TVA CRTN 25.3 197 iP :03.50 ( 0.21 ) eS :06.50 (-0.57 ) TVA SMTN 52.0 94 iP- :07.26 ( 0.02 ) eS :13.90 ( 0.00 ) TVA LMTN 66.9 152 eP :09.30 (-0.19 ) eS :16.40 (-1.40X) TVA BRTN 80.3 95 iP :11.35 (-0.19 ) iS :21.60 ( 0.25 ) TVA TKL 84.4 181 eP :12.10 (-0.04 ) eS :22.70 ( 0.31 ) TVA GBTN 92.9 206 eP- :13.32 (-0.11 ) eS :24.84 ( 0.22 ) TVA RICH 101.2 123 eP :14.58 (-0.18 ) eS :27.20 ( 0.28 ) TVA BHT 124.1 240 eP :14.78 (-3.47X) eS :33.74 ( 0.77X) TVA WSSR 127.6 173 eP :18.86 ( 0.02 ) eS :34.80 ( 0.83X) TVA TQTN 132.7 221 eS :36.90 ( 1.74X) TVA ANTN 135.0 259 iP :19.25 (-0.65 ) eS :35.80 (-0.01 ) TVA ETT 136.5 208 eP :19.80 (-0.33 ) eS :36.72 ( 0.51 ) TVA RBNC 136.9 149 eP :20.42 ( 0.11 ) eS :37.24 ( 0.72X) TVA BRBC 152.7 119 eP :23.84 ( 1.11X) eS :40.84 ( 0.14 ) TVA BBG 171.4 182 eP :25.42 (-0.12 ) eS :46.04 ( 0.47 ) TVA GFM 178.8 100 eP :26.58 (-0.12 ) eS :47.78 ( 0.21 ) TVA FDKY 186.6 283 eP :28.20 ( 0.43 ) eS :50.30 ( 0.87 ) TVA TRYN 187.2 133 eP :26.98 (-0.93 ) eS :50.80 ( 1.13X) TVA GMG 191.3 206 eP :28.90 ( 0.34 ) eS :51.80 ( 1.01X) TVA BENN 211.6 116 eP :31.80 ( 0.19 ) eS :57.12 ( 1.06 ) TVA RCG 215.2 222 eP :33.02 ( 1.03 ) eS :59.62 ( 2.89X) TVA ABTN 219.5 255 eP :32.38 (-0.13 ) eS :59.00 ( 1.38 ) TVA PLVA 234.4 82 eP :34.38 (-0.07 ) eS :46:00.34 (-0.64 ) TVA LKGA 252.6 218 eS :09.00 ( 4.33X) TVA HAKY 263.5 288 eS :09.60 ( 2.71X) ***** 1991 MARCH 7; 09:31 - RAFTER, TENNESSEE ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 910307 093140.5 35.482 84.232 12.7 9 21 165 0.1 B A/C 0.4 -38 0.1 0.6 A 1.3 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI GBTN 20.5 5 iPd 09:31:44.66 ( 0.03 ) eS 09:31:47.58 (-0.08 ) CERI ETT 26.7 230 eP- :45.58 ( 0.02 ) eS :49.22 (-0.04 ) CERI TKL 45.9 65 eP- :48.62 ( 0.03 ) eS :54.52 ( 0.02 ) CERI WSSR 63.6 111 eP :50.74 (-0.81X) eS :59.52 (-0.10 ) CERI BBG 77.6 150 eP :54.04 ( 0.35X) eS :32:03.40 ( 0.08 ) CERI GMG 79.5 210 eP :53.76 (-0.19X) eS :03.80 ( 0.01 ) Additional Data: GIT CDG P 09:32:10.5 S 09:32:23.8 ***** 1991 MARCH 15; 01:40 - SANDY HOOK, VIRGINIA ***** VTSO Foreshock of March 15 06:54 event. SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I VTSO 910315 014023.0 37.725 77.883 5.2 11 21 201 0.2 D C/D 1.0 -66 0.6 7.4 D 1.3 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) VTSO GHV 21.2 291 iPd 01:40:26.89 ( 0.26 ) eS 01:40:29.35 ( 0.10 ) VTSO NA12 28.6 1 iPc :28.05 ( 0.23 ) eS :31.08 (-0.23 ) VTSO NA2 46.2 15 iPc :30.87 ( 0.20 ) eS :35.83 (-0.41 ) VTSO CVL 58.3 299 eP :32.69 ( 0.04 ) eS :39.50 (-0.16 ) VTSO FRV 71.7 216 eP :34.90 ( 0.06 ) S :42.99 (-0.46 ) VTSO PBV 88.1 159 eS :48.18 ( 0.06 ) ***** 1991 MARCH 15; 06:54 - SANDY HOOK, VIRGINIA ***** CERI For informational purposes only. NEIC Felt (V) at Goochland, Kents Store, Sandy Hook and Troy; (IV) at Bumpass, Crozier, Dillwyn, Fork Union, Hadensville, Oilville and Rockville; (III) at Amherst, Beaverdam, Bremo Bluff, Maidens, Manakin Sabot, Mineral, Mine Run, Scottsville and Somerset, Virginia. VTSO This mainshock and its associated foreshock and aftershocks were the subject of a paper that appeared in Seismological Research Letters, 1991, vol. 62, pp. 225-231 (see Appendix E). SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 910315 065356.0 38.784 77.442 10.0F 12 403 344 0.7 D D/D 99.0 53 26.0 99.0 D 3.3 NEIC 910315 065408.3 37.746 77.916 17.5 18 18 3.8 5 VTSO 910315 065408.3 37.746 77.909 15.5 13 18 116 0.2 B B/B 0.8 -64 0.5 2.5 B 3.8 3.3 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI PLVA 403.3 236 eP 06:54:54.68 ( 0.33 ) eS 06:55:32.86 (-4.10X) CERI PKNC 447.7 228 eS :41.32 (-4.91X) CERI PKNC 447.7 228 eP :59.16 (-0.54 ) CERI GFM 486.9 234 eP :55:03.88 (-0.73 ) eS :53.92 (-0.81 ) CERI BENN 517.6 228 eP :09.28 ( 1.03 ) eS :56:01.58 ( 0.56 ) CERI BRBC 546.5 233 eP :11.20 (-0.73 ) eS :09.66 ( 2.28 ) CERI RICH 572.6 238 eP :15.44 ( 0.45 ) CERI SMTN 572.7 244 eP :15.90 ( 0.93 ) CERI TRYN 578.6 229 eP :15.76 ( 0.04 ) CERI CCVA 599.8 248 eP :23.52 ( 5.26X) CERI RBNC 622.4 234 eP :19.54 (-1.65X) CERI WSSR 670.1 236 eP :27.20 ( 0.23 ) CERI GBTN 692.9 242 eP :30.94 ( 1.32X) CERI ETT 732.0 241 eP :32.12 (-2.31X) NEIC GHV 17.8 288 P 06:54:12.36 (-0.3 ) NEIC NA12 26.7 7 P :13.54 (-0.3 ) NEIC NA2 44.5 19 P :16.22 (-0.4 ) NEIC CVL 54.5 299 P :17.81 (-0.3 ) NEIC CBN 70.1 43 eP :20.10 (-0.3 ) e 06:54:28.30 ( X) NEIC CNV 70.1 43 P :20.04 (-0.4 ) NEIC FRV 72.3 213 P :20.38 (-0.4 ) NEIC PBV 91.2 158 eP :23.39 (-0.3 ) NEIC BLA 229.1 256 eP :44.80 ( 2.2 ) NEIC NAV 259.1 260 eP :48.60 ( 2.2 ) NEIC PNJ 478.2 42 Pn :55:13.00 (-1.3 ) NEIC JSC 488.2 219 eP? :15.00 (-0.7 ) NEIC CLE 519.3 324 iP :08.90 (-10.7 ) NEIC SGS 557.1 206 eP? :25.00 ( 0.6 ) NEIC PRM 571.6 226 eP? :27.40 ( 1.2 ) NEIC TKL 572.7 248 eP :28.00 ( 1.6 ) NEIC RSNY 807.3 20 P :56:00.00 ( 3.9 ) NEIC FVM 1100.9 275 P :40.00 ( 7.3 ) VTSO GHV 18.3 287 iPd 06:54:12.36 ( 0.12 ) VTSO NA12 26.4 6 iPc :13.54 ( 0.21 ) eS? 06:54:16.60 (-0.39 ) VTSO NA2 44.6 19 iPc :16.22 ( 0.19 ) S? :21.32 (-0.35 ) VTSO CVL 55.1 298 iPd :17.81 ( 0.15 ) iS :24.32 (-0.15 ) VTSO CNV 69.3 43 ePc :20.04 ( 0.20 ) S :28.24 ( 0.03 ) VTSO FRV 72.3 214 eP :20.38 ( 0.08 ) S :28.76 (-0.25 ) VTSO PBV 91.2 158 ePd :23.39 ( 0.19 ) S :33.57 (-0.42 ) ***** 1991 MARCH 15; 07:05 - SANDY HOOK, VIRGINIA ***** VTSO Aftershock of March 15 06:54 event. SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I VTSO 910315 070556.3 37.738 77.909 10.4 11 19 196 0.3 D C/D 1.2 -65 0.8 4.5 C 0.4 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) VTSO GHV 18.5 290 iPd 07:06:00.18 ( 0.37 ) S? 07:06:02.36 ( 0.00 ) VTSO NA12 27.3 5 eP :01.32 ( 0.21 ) iS :04.58 (-0.04 ) VTSO NA2 45.5 18 eP :04.02 ( 0.05 ) eS :09.04 (-0.52 ) VTSO CVL 55.5 299 eP :05.97 ( 0.38 ) S :11.96 (-0.41 ) VTSO FRV 71.5 214 eP :08.18 ( 0.00 ) eS :16.33 (-0.51 ) VTSO PBV 90.3 158 eS? :22.23 ( 0.09 ) ***** 1991 MARCH 15; 21:05 - SANDY HOOK, VIRGINIA ***** VTSO Aftershock of March 15 06:54 event. SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I VTSO 910315 210535.9 37.772 77.931 14.7 7 16 257 0.3 D D/D 4.8 -28 1.6 2.7 C 0.1 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) VTSO GHV 15.8 279 iPd 21:05:39.53 ( 0.09 ) S? 21:05:41.99 (-0.04 ) VTSO NA12 23.8 11 iPu :40.70 ( 0.20 ) S? :43.63 (-0.23 ) VTSO NA2 42.6 22 eP? :43.38 ( 0.09 ) eS? :47.03 (-1.66X) VTSO CVL 52.1 297 eP? :43.95 (-0.84 ) S :51.60 ( 0.31 ) VTSO FRV 73.7 211 eP? :45.68 (-2.44X) ***** 1991 MARCH 27; 22:04 - SUMMERVILLE, SOUTH CAROLINA ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I USC 910327 220447.8 33.019 80.177 8.6 9 9 91 0.0 0.4 360 0.4 0.9 1.8 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC SVS 8.7 230 iPd 22:04:50.18 (-0.01 ) USC BCS 11.3 112 iPc :50.62 (-0.04 ) USC RGR 12.5 188 iPd :50.61 (-0.03 ) USC TWB 12.7 33 iPd :50.79 ( 0.03 ) USC MGS 13.9 165 iPd :50.94 ( 0.04 ) USC HBF 16.5 242 iPd :51.18 (-0.05 ) USC WAS 21.1 205 iPd :52.05 ( 0.06 ) USC DRC 22.0 297 iPc :52.24 ( 0.03 ) USC CFS 28.8 1 eP+ :52.50 (-0.76X) USC HWD 32.7 198 eP- :54.30 ( 0.39X) USC SGS 36.5 302 iPc :54.52 (-0.03 ) USC MTT 158.8 301 eP- :05:13.65 ( 0.69X) USC JSC 173.0 325 eP- :15.93 ( 1.40X) ***** 1991 MARCH 28; 10:26 - HUNTSVILLE, ALABAMA ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I TVA 910328 102616.7 34.627 86.243 12.7 12 46 168 0.2 C B/C 0.5 -1 0.4 1.0 A 1.8 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) TVA MSAL 46.3 302 iP 10:26:25.18 ( 0.33 ) iS 10:26:30.56 (-0.25 ) TVA LKGA 70.7 90 iP :28.68 (-0.09 ) iS :37.58 (-0.02 ) TVA PDTN 80.3 27 eP :30.60 ( 0.40 ) iS :40.00 (-0.07 ) TVA LAL 102.6 258 iP :33.60 (-0.03 ) eS :46.02 ( 0.03 ) TVA ABTN 140.2 5 eP :39.19 (-0.20 ) eS :56.70 ( 0.74 ) TVA ANTN 194.5 28 eP :47.36 (-0.37 ) eS :27:11.46 ( 1.07 ) ***** 1991 MARCH 28; 20:33 - BIRMINGHAM, ALABAMA ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I TVA 910328 203319.5 33.394 86.551 28.4 10 137 292 0.2 D D/D 3.5 -7 1.4 1.6 C 2.9 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) TVA LAL 136.6 328 iP 20:33:41.65 ( 0.01 ) TVA LKGA 168.9 36 eP :46.60 ( 0.02 ) eS 20:34:06.28 (-0.08 ) TVA PDTN 218.2 17 iP :52.65 (-0.08 ) eS :17.00 ( 0.00 ) TVA WMTN 251.8 35 eP :58.72 ( 1.89X) eS :37.10 TVA ABTN 279.4 8 iP :34:00.09 (-0.11 ) TVA TCT 303.9 343 eP :33:58.40 (-4.79X) TVA ANTN 331.0 21 eP :34:07.70 ( 1.15 ) eS :42.09 ( 1.19 ) TVA MOTN 380.9 340 eP :16.25 ( 3.65X) eS :52.00 ( 0.62 ) TVA FDKY 383.1 10 eP :09.95 (-2.92X) eS :52.20 ( 0.35 ) TVA HAKY 411.8 360 eP :23.90 ( 7.53X) Additional Data: GIT DALG P 20:33:54.4 S 20:34:16.3 GIT ATL P :55.7 S :18.9 GIT CDG P :56.5 S :19.2 ***** 1991 APRIL 15; 05:55 - SEVIER COUNTY, TENNESSEE ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 910415 055546.7 35.591 83.590 4.3 14 35 108 0.2 C B/C 0.4 -59 0.3 2.1 B 2.2 TVA 910415 055546.8 35.590 83.594 2.7 14 35 108 0.4 C C/C 0.3 -69 0.3 0.9 A 2.2 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI WSSR 34.8 178 iPc 05:55:53.14 ( 0.11 ) eS 05:55:57.36 (-0.27 ) CERI LMTN 36.7 26 iP :53.10 (-0.19 ) iS :58.10 ( 0.02 ) CERI GBTN 56.8 279 eP- :56.62 ( 0.01 ) iS :56:03.88 ( 0.07 ) CERI RBNC 60.7 115 iPc :57.40 ( 0.06 ) eS :05.30 ( 0.21 ) CERI SMTN 95.2 23 eP :56:03.74 ( 0.77X) CERI BRTN 107.1 37 eP :06.60 ( 1.66 ) eS :18.50 ( 0.27 ) CERI BRBC 119.2 82 eP :06.96 ( 0.03 ) eS :20.98 (-0.69 ) CERI BENN 174.9 90 eS :36.46 ( 0.21 ) CERI PKNC 225.6 76 eP :23.64 ( 0.54 ) TVA WSSR 34.6 178 iPc 05:55:53.14 ( 0.18 ) eS 05:55:57.36 (-0.11 ) TVA LMTN 36.9 27 iP :53.10 (-0.26 ) iS :58.10 (-0.07 ) TVA GBTN 56.5 279 eP- :56.62 (-0.09 ) iS :56:03.88 (-0.08 ) TVA RBNC 60.9 115 iPc :57.40 (-0.12 ) eS :05.30 (-0.07 ) TVA SMTN 95.4 23 eP :56:03.74 ( 0.58X) TVA BRTN 107.4 37 eP :06.60 ( 1.47 ) eS :18.50 (-0.03 ) TVA BRBC 119.6 82 eP :06.96 (-0.20 ) eS :20.98 (-1.06 ) TVA BENN 175.2 90 eS :36.46 (-0.16 ) TVA PKNC 225.9 76 eP :23.64 ( 0.30 ) ***** 1991 APRIL 22; 01:01 - CAMPWOOD, WEST VIRGINIA ***** NEIC Felt (IV) at Auto and (III) at Caldwell, West Virginia. CERI For informational purposes only. SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 910422 010119.3 37.996 80.266 7.9 23 168 317 0.3 D D/D 3.3 -82 1.2 2.3 C 3.4 VTSO 910422 010120.2 37.942 80.205 14.8 12 55 318 0.4 D D/D 2.5 30 2.4 99.0 D 3.5 NEIC 910422 010120.3 37.941 80.207 14.7 23 56 3.5 4 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI PLVA 167.5 209 iPd 01:01:46.72 ( 0.18 ) eS 01:02:06.14 (-0.31 ) CERI PKNC 230.5 200 iPd :56.20 ( 0.07 ) eS :23.36 ( 0.32 ) CERI GFM 250.1 214 iPc :58.94 (-0.26 ) eS :28.40 ( 0.04 ) CERI BENN 297.1 205 eP :02:05.48 ( 0.64 ) eS :38.08 (-0.03 ) CERI BRBC 308.5 216 eP :06.12 (-0.25 ) eS :41.86 ( 1.10X) CERI SMTN 314.8 236 iPd :07.32 ( 0.33 ) eS :42.02 ( 0.19X) CERI RICH 323.7 225 iPd :08.16 ( 0.05 ) eS :45.28 ( 1.52X) CERI CCVA 338.8 244 eP :09.74 (-0.16 ) eS :46.62 (-0.23 ) CERI TRYN 350.8 211 eP+ :10.82 (-0.59 ) eS :49.30 (-0.17X) CERI RBNC 380.6 221 eP- :14.92 (-0.25 ) eS :56.70 ( 0.72 ) CERI TKL 406.4 231 eP- :17.84 (-0.30 ) eS :03:01.60 ( 0.49 ) CERI GBTN 436.6 235 eP :21.88 ( 0.05 ) eS :07.22 (-0.27 ) CERI BBG 470.1 224 eP :26.08 ( 0.03 ) eS :16.26 ( 1.46 ) CERI ETT 477.4 233 eP :27.60 ( 0.75X) eS :15.42 (-0.77X) CERI GMG 526.0 230 eP :32.52 (-0.34 ) CERI PWLA 774.4 247 iPd :03:03.38 ( 0.28X) VTSO VWV 55.3 197 Pu 01:01:29.70 (-0.16 ) SLG 01:01:36.25 (-0.27 ) VTSO HWV 68.3 235 Pu :31.87 ( 0.07 ) S? :39.06 (-0.78 ) VTSO BLA 83.3 193 eP+ :34.28 ( 0.17 ) eS :43.87 ( 0.11 ) VTSO NAV 86.8 217 iPu :34.60 (-0.04 ) S :44.56 (-0.10 ) VTSO PWV 100.4 228 iPu :37.00 ( 0.25 ) eS :49.19 ( 0.94 ) VTSO WMV 114.6 216 eP :38.70 (-0.25 ) eS :52.30 ( 0.32 ) VTSO CVL 153.3 88 eP :45.25 ( 0.45X) eS :02:02.78 ( 0.84X) VTSO FRV 182.5 116 eP+ :49.84 ( 0.57X) SLG :10.72 ( 1.18X) VTSO GHV 185.3 94 eP :50.26 ( 0.57X) eS :11.65 ( 1.40X) VTSO NA12 204.4 88 eP- :53.29 ( 0.68X) S :16.88 ( 1.65X) VTSO NA2 216.8 84 eP :54.98 ( 0.48X) eS? :20.13 ( 1.69X) VTSO NA5 217.0 87 eP :54.81 ( 0.27X) eS? :20.16 ( 1.65X) VTSO CNV 250.2 82 eP :59.88 ( 0.69X) eS? :29.14 ( 2.55X) VTSO PBV 259.4 113 eP? :02:01.36 ( 1.05X) eS? :31.05 ( 2.54X) NEIC VWV 55.6 197 Pc 01:01:29.70 (-0.5 ) S 01:01:36.25 ( X) NEIC HWV 67.8 235 Pc :31.87 (-0.3 ) S :39.06 ( X) NEIC BLA 83.4 193 eP :34.37 (-0.1 ) eS :43.87 ( X) NEIC NAV 86.7 217 iPc :34.60 (-0.4 ) eS :44.56 ( X) NEIC PWV 100.1 228 iPc :37.00 (-0.1 ) eS :49.19 ( X) NEIC WMV 114.5 216 eP :38.70 (-0.7 ) eS :52.30 ( X) NEIC CVL 153.5 88 eP :45.25 ( 0.3 ) NEIC FRV 182.4 116 eP :49.84 ( 1.1 ) NEIC GHV 185.7 94 eP :50.26 ( 1.2 ) NEIC NA12 204.6 88 eP :53.29 ( 1.7 ) NEIC NA2 216.8 84 eP :54.98 ( 1.8 ) NEIC CBN 250.2 82 eP :02:00.00 ( 2.5 ) eS :02:29.00 ( X) NEIC CNV 250.2 82 eP :01:59.88 ( 2.4 ) NEIC PBV 259.1 113 eP :02:01.36 ( 2.7 ) NEIC LHS 388.1 188 eP :15.10 ( 0.0 ) NEIC TKL 407.0 233 eP :17.40 (-0.1 ) NEIC CLE 410.3 344 iP :25.30 ( 7.4 ) NEIC GBTN 437.0 236 eP :21.60 ( 0.2 ) NEIC PRM 470.4 205 eP :25.50 (-0.1 ) NEIC RSCP 544.9 243 eP :35.20 ( 0.1 ) NEIC DLA 558.2 348 P :46.60 ( 9.8 ) NEIC LDN 572.7 352 P :50.50 (11.9 ) NEIC ELF 590.5 351 P :54.60 (13.6 ) Additional Data: DGS NED eP 01:02:29.9 iS 01:03:19.9 DGS BBD eS :20.0 DGS BVD eS :20.0 DGS BWD eP :31.4 eS :24.0 ***** 1991 APRIL 23; 20:39 - MIDDLETON PLACE, SOUTH CAROLINA ***** CSU Magnitude 1.37. USGS NOTE: Fault Plane Solution (strike, dip, rake) Nodal Plane: 165.0 50.0 150.0 Nodal Plane: -84.6 67.5 44.1 P Axis: 36.5 79.4 T Axis: 137.8 43.5 SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I USC 910423 203949.1 33.945 80.132 5.2 7 5 133 0.0 0.7 360 0.7 2.0 1.7 USGS 910423 203949.3 32.953 80.151 6.4 14 6 0.2 1.3 0 1.1 3.6 1.4 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC MGS 5.3 190 iPd 20:39:50.67 (-0.02 ) USC RGR 7.1 235 iPd :50.89 (-0.01 ) USC BCS 7.3 57 iPd :51.13 ( 0.00 ) USC SVS 11.1 284 iPu :51.66 ( 0.05 ) USC WAS 17.0 231 iPd :52.55 ( 0.04 ) USC HBF 18.7 271 iPd :52.70 (-0.08 ) USC TWB 19.1 8 iPd :52.96 ( 0.00 ) USGS MGS 6.3 171 iPd 20:39:50.67 (-0.43 ) S 20:39:51.24 (-0.40 ) USGS RGR 6.6 217 iPd :50.91 (-0.18 ) S :52.95 ( 0.30 ) USGS BCS 8.9 69 iPd :51.25 (-0.15 ) S :52.73 (-0.09 ) USGS SVS 9.3 280 eP+ :51.65 ( 0.06 ) S :52.95 (-0.13 ) USGS WAS 16.3 224 eP- :52.58 ( 0.04 ) S :55.22 ( 0.21 ) USGS TWB 18.5 14 iPd :52.98 ( 0.08 ) S :55.22 (-0.07 ) USGS HBF 21.3 264 iPd :52.78 (-0.20 ) S :54.83 (-0.30 ) ***** 1991 APRIL 24; 03:42 - MIDDLETON PLACE, SOUTH CAROLINA ***** CSU Magnitude 1.39. USGS NOTE: Fault Plane Solution (strike, dip, rake) Nodal Plane: -60.0 90.0 -10.0 Nodal Plane: 30.0 80.0 -180.0 P Axis: 254.6 82.9 T Axis: 345.4 82.9 SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I USGS 910424 034221.9 32.933 80.188 9.3 14 3 0.1 1.7 0 1.0 1.9 1.4 USC 910424 034221.9 32.949 80.174 8.2 7 5 80 0.0 0.6 360 0.6 0.9 1.4 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USGS RGR 3.1 190 iPc 03:42:23.75 ( 0.05 ) S 03:42:24.60 (-0.19 ) USGS MGS 6.0 132 iPc :23.99 ( 0.01 ) S :24.78 (-0.34 ) USGS SVS 6.9 304 iPc :24.15 ( 0.03 ) S :25.45 (-0.11 ) USGS BCS 12.9 65 iPd :24.60 (-0.16 ) S :29.09 ( 0.78 ) USGS HBF 17.8 270 iPd :25.06 (-0.08 ) S :26.59 (-0.34 ) USGS TWB 21.7 21 eP+ :25.90 (-0.15 ) S :27.98 (-0.53 ) USGS SGS 41.8 313 eP+ :29.44 (-0.03 ) S :33.48 (-0.52 ) USC RGR 5.0 203 iPc 03:42:23.80 ( 0.04 ) USC MGS 6.5 151 iPc :23.96 (-0.01 ) USC SVS 7.3 288 iPc :24.10 ( 0.02 ) USC BCS 10.7 71 iPd :24.62 (-0.03 ) USC HBF 14.8 270 iPd :24.98 (-0.07 ) USC TWB 19.6 19 ePc :25.94 ( 0.01 ) USC SGS 41.4 311 ePc :29.47 ( 0.02 ) USC VRN 72.1 278 eP- :34.10 (-0.12X) ***** 1991 APRIL 28; 19:37 - BINFIELD, TENNESSEE ***** CERI/TVA This event is an earthquake. GIT This event is probably a blast. SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 910428 193743.9 35.730 84.099 11.1 24 12 82 0.2 B B/B 0.4 -53 0.3 0.8 A 2.8 TVA 910428 193744.0 35.733 84.102 8.7 31 12 83 0.3 C C/B 0.3 -59 0.2 0.7 A 2.5 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI GBTN 12.4 235 iPd 19:37:46.86 ( 0.08 ) CERI ORT 27.3 317 iP :49.10 ( 0.15 ) CERI TKL 30.5 105 iPc :49.64 ( 0.19 ) eS 19:37:53.64 ( 0.12 ) CERI ETT 55.3 216 iPd :53.36 (-0.13 ) eS :38:00.16 (-0.34 ) CERI CRTN 57.1 24 iP :53.65 (-0.13 ) iS :01.00 (-0.01 ) CERI LMTN 64.7 74 eP :54.80 (-0.23 ) eS :02.80 (-0.37 ) CERI BBG 98.5 165 eP+ :38:00.48 ( 0.09 ) eS :12.36 (-0.08 ) CERI CCVA 104.3 22 eS :13.80 (-0.05 ) CERI RBNC 109.1 112 eP- :02.32 ( 0.27 ) eS :15.46 ( 0.15 ) CERI GMG 109.4 209 eP :01.94 (-0.09 ) eS :16.08 ( 0.81 ) CERI SMTN 109.8 49 eP+ :02.10 ( 0.03 ) CERI RICH 117.6 79 eP- :04.18 ( 0.91 ) CERI BRTN 130.9 58 eP :05.70 ( 0.41 ) eS :22.32 ( 1.41X) CERI RCG 141.1 234 eP :07.30 ( 0.47 ) CERI BRBC 164.0 89 eP+ :11.06 ( 0.58 ) eS :30.50 ( 0.61 ) CERI PDTN 166.7 253 eP :11.20 ( 0.46X) eS :32.70 ( 2.35X) CERI TRYN 175.8 106 eP- :13.12 ( 0.93 ) eS :34.14 ( 1.29X) CERI GFM 211.1 78 eP- :18.20 ( 0.53X) eS :43.44 ( 1.11X) CERI BENN 221.5 94 eS :46.62 ( 1.66X) CERI PKNC 267.9 82 eP+ :26.80 ( 1.29X) CERI HAKY 270.2 305 eP :27.00 ( 1.30X) eS :39:00.50 ( 4.28X) CERI PLVA 284.0 68 eP :26.98 (-0.57X) TVA GBTN 12.3 233 iPd 19:37:46.86 ( 0.19 ) TVA ORT 26.8 317 iP :49.10 ( 0.20 ) TVA TKL 30.8 106 ePc :49.64 ( 0.08 ) eS 19:37:53.64 ( 0.04 ) TVA ETT 55.4 215 ePd :53.36 (-0.24 ) eS :38:00.16 (-0.42 ) TVA CRTN 56.9 24 iP :53.65 (-0.19 ) iS :01.00 (-0.01 ) TVA LMTN 64.9 75 eP :54.80 (-0.36 ) eS :02.80 (-0.49 ) TVA BBG 98.9 164 ePc :38:00.48 (-0.26 ) eS :12.36 (-0.58 ) TVA CCVA 104.2 22 :00.00 (-1.47X) eS :13.80 (-0.41 ) TVA RBNC 109.5 112 eP- :02.32 (-0.08 ) eS :15.46 (-0.35 ) TVA GMG 109.5 208 eP :01.94 (-0.40 ) eS :16.08 ( 0.37 ) TVA SMTN 109.8 49 eP+ :02.10 (-0.25 ) TVA RICH 117.8 80 eP- :04.18 ( 0.59 ) TVA BRTN 131.0 58 eP :05.70 ( 0.11 ) eS :21.22 (-0.11 ) TVA RCG 141.1 234 eP :07.30 ( 0.19 ) TVA BRBC 164.3 89 eP+ :11.06 ( 0.25 ) eS :30.50 ( 0.14 ) TVA PDTN 166.5 253 eP :11.20 ( 0.20X) eS :32.70 ( 2.00X) TVA TRYN 176.2 107 eP- :13.12 ( 0.59 ) eS :34.14 ( 0.80 ) TVA GFM 211.3 78 eP- :18.20 ( 0.21 ) eS :43.44 ( 0.66 ) TVA BENN 221.9 94 eS :46.62 ( 1.18 ) TVA PKNC 268.1 82 eP+ :26.80 ( 1.45 ) TVA HAKY 269.8 305 eP :27.00 ( 1.52X) eS :39:00.50 ( 4.76X) TVA PLVA 284.1 68 eP :26.98 (-0.40 ) ***** 1991 APRIL 29; 15:13 - GILES COUNTY, VIRGINIA ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I VTSO 910429 151329.7 37.171 80.909 16.7 12 9 134 0.2 B B/B 0.8 43 0.6 1.4 B 1.6 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) VTSO WMV 8.8 218 iPd 15:13:33.08 ( 0.02 ) S 15:13:35.41 ( 0.04 ) VTSO NAV 19.0 32 iPd :34.04 ( 0.02 ) SLG :37.18 ( 0.18 ) VTSO PWV 22.0 326 iPu :34.49 ( 0.07 ) eS? :37.37 (-0.31 ) VTSO BLA 43.6 84 eP- :37.77 ( 0.24 ) eS? :42.63 (-0.32 ) VTSO HWV 46.9 7 P+ :38.04 ( 0.02 ) SLG :43.93 ( 0.14 ) VTSO VWV 56.3 54 eP- :39.33 (-0.16 ) SLG :46.27 ( 0.00 ) ***** 1991 APRIL 30; 06:39 - FALLING CREEK FARMS, VIRGINIA ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I VTSO 910430 063951.6 37.450 77.588 10.8 14 52 185 0.2 C B/D 0.8 85 0.4 2.0 B 1.4 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) VTSO PBV 52.2 174 iP- 06:40:00.35 ( 0.03 ) eSL 06:40:06.55 (-0.16 ) VTSO GHV 59.7 310 iP :01.80 ( 0.26 ) SLG :08.76 (-0.05 ) VTSO NA5 63.6 348 P :02.18 ( 0.01 ) iSG :10.21 ( 0.30 ) VTSO NA12 64.5 337 P+ :02.40 ( 0.08 ) eS? :09.94 (-0.22 ) VTSO FRV 73.7 248 iP :03.90 ( 0.09 ) eSL :12.62 (-0.11 ) VTSO NA2 76.4 349 eP? :04.10 (-0.15 ) eS? :13.19 (-0.32 ) VTSO CVL 96.9 308 eP? :07.90 ( 0.30 ) eS? :18.96 (-0.28 ) ***** 1991 MAY 5; 03:02 - WHITE HOLLOW, TENNESSEE ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I TVA 910505 030216.7 36.343 83.970 22.3 9 20 142 0.2 C B/C 0.8 -49 0.4 1.2 A 1.9 CERI 910505 030216.8 36.336 83.949 23.4 21 18 139 0.2 C B/C 0.7 -59 0.3 0.8 A 1.9 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) TVA CRTN 19.7 144 iP 03:02:21.80 ( 0.11 ) iS 03:02:25.10 (-0.21 ) TVA CCVA 39.6 43 iPd :24.32 ( 0.09 ) eS :29.78 ( 0.07 ) TVA ORT 56.8 212 eP :26.80 ( 0.10 ) eS :34.35 ( 0.38 ) TVA SMTN 70.8 86 iPd :28.74 (-0.10 ) TVA LMTN 71.4 135 eP :28.80 (-0.12 ) TVA TKL 78.0 167 eP+ :29.56 (-0.32X) eS :39.28 (-0.20X) TVA GBTN 78.2 196 iPc :29.74 (-0.17X) eS :39.72 ( 0.20X) TVA BRTN 98.9 89 eP :32.74 (-0.34X) eS :49.04 ( 4.03X) TVA BHT 103.6 238 eP :33.62 (-0.19X) eS :46.92 ( 0.64X) TVA RICH 113.8 114 eP :34.98 (-0.39X) TVA TQTN 114.3 217 eP :34.39 (-1.00X) eS :49.72 ( 0.72X) TVA ANTN 115.0 261 eP- :35.19 (-0.33 ) TVA ETT 121.0 201 eP :36.18 (-0.26X) eS :51.16 ( 0.34X) TVA RBNC 140.9 141 eP :39.32 (-0.28X) eS :56.24 (-0.05X) TVA BBG 163.6 175 eP+ :42.58 (-0.44X) eS :03:02.96 ( 0.75X) TVA SLTN 166.3 86 eP :42.91 (-0.52X) eS :03.50 ( 0.59X) TVA GMG 176.1 201 eP :45.28 ( 0.37X) eS :06.22 ( 0.75X) TVA GFM 196.1 97 eP :47.96 (-0.07X) TVA ABTN 199.2 256 eP :48.71 ( 0.49X) eS :12.50 ( 1.30X) CERI CRTN 17.9 147 iP 03:02:21.80 ( 0.11 ) iS 03:02:25.10 (-0.17 ) CERI CCVA 39.0 40 iPd :24.32 ( 0.05 ) eS :29.78 ( 0.06 ) CERI ORT 57.1 214 eP :26.80 (-0.03 ) eS :34.35 ( 0.19 ) CERI SMTN 69.1 85 iPd :28.74 ( 0.08 ) CERI LMTN 69.6 136 eP :28.80 ( 0.08 ) CERI TKL 76.7 168 eP+ :29.56 (-0.22 ) eS :39.28 ( 0.03 ) CERI GBTN 77.9 198 iPc :29.74 (-0.21 ) eS :39.72 ( 0.17 ) CERI BRTN 97.1 88 eP :32.74 (-0.14 ) eS :49.04 ( 4.42X) CERI BHT 104.8 239 eP :33.62 (-0.44X) eS :46.92 ( 0.25X) CERI RICH 111.8 114 eP :34.98 (-0.16 ) CERI TQTN 114.8 218 eP :34.39 (-1.14X) eS :49.72 ( 0.51X) CERI ANTN 116.6 261 eP- :35.19 (-0.66 ) CERI ETT 121.0 202 eP :36.18 (-0.32 ) eS :51.16 ( 0.27 ) CERI RBNC 139.1 141 eP :39.32 (-0.06 ) eS :56.24 ( 0.37X) CERI BBG 162.6 176 eP+ :42.58 (-0.34 ) eS :03:02.96 ( 0.96X) CERI SLTN 164.5 85 eP :42.91 (-0.21 ) eS :03.50 ( 1.17X) CERI GMG 176.0 202 eP :45.28 ( 0.32 ) eS :06.22 ( 0.71X) CERI GFM 194.2 97 eP :47.96 ( 0.16X) CERI ABTN 200.8 256 eP :48.71 ( 0.03X) eS :12.50 ( 0.55X) ***** 1991 MAY 10; 13:50 - ROCKWOOD, TENNESSEE ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 910510 135043.0 35.757 84.671 5.8 23 27 97 0.3 C C/C 0.6 9 0.5 3.2 C 2.6 TVA 910510 135043.0 35.758 84.669 6.4 14 27 98 0.3 C C/C 0.4 7 0.3 2.7 C 2.6 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI BHT 26.7 292 iP 13:50:47.50 (-0.32 ) CERI TQTN 27.1 191 iPc :48.19 ( 0.34 ) eS 13:50:51.70 ( 0.29 ) CERI ORT 37.2 63 iP- :49.67 ( 0.15 ) CERI GBTN 42.8 103 eP :50.50 ( 0.05 ) eS :55.50 (-0.40 ) CERI ETT 51.6 158 iP+ :51.50 (-0.42 ) eS :58.00 (-0.45 ) CERI ANTN 68.4 312 iP :54.63 (-0.07 ) CERI TKL 81.9 97 eP :57.00 ( 0.09 ) eS :51:07.50 ( 0.42 ) CERI CRTN 89.6 56 iP- :58.27 ( 0.08 ) eS :09.25 (-0.04 ) CERI LMTN 114.9 82 eP :51:02.81 ( 0.56 ) eS :15.81 (-0.51X) CERI PDTN 119.6 244 eP :03.00 ( 0.05X) eS :14.50 (-3.03X) CERI BBG 125.3 141 eP :03.50 (-0.41 ) eS :21.00 ( 1.80X) CERI ABTN 130.8 277 iP :04.85 ( 0.19 ) CERI LKGA 145.4 210 eP :07.27 ( 0.35 ) eS :25.01 ( 0.61 ) CERI FDKY 152.8 319 eP :08.29 ( 0.26 ) eS :27.00 ( 0.69 ) CERI BRTN 175.6 67 eP :12.39 ( 0.84 ) eS :33.93 ( 1.53X) CERI MSAL 208.2 242 eP+ :16.25 (-0.27 ) eS :41.89 ( 0.89 ) CERI HAKY 227.8 312 eP :19.65 ( 0.17X) eS :47.45 ( 1.32X) CERI SLTN 242.0 71 eP :22.21 ( 0.54X) eS :49.95 ( 0.04X) CERI TCT 261.7 277 eP :24.63 ( 0.26X) eS :55.71 ( 1.13X) CERI LAL 283.8 240 eP :27.45 ( 0.37X) eS :52:02.77 ( 3.50X) CERI MOTN 313.2 289 eP :33.17 ( 2.52X) eS :09.41 ( 3.95X) TVA BHT 26.9 292 iP 13:50:47.50 (-0.34 ) TVA TQTN 27.3 191 iPc :48.19 ( 0.31 ) eS 13:50:51.70 ( 0.24 ) TVA ORT 36.9 63 iP- :49.67 ( 0.19 ) TVA GBTN 42.7 104 eP :50.50 ( 0.08 ) eS :55.50 (-0.34 ) TVA ETT 51.7 158 iP+ :51.50 (-0.42 ) eS :58.00 (-0.44 ) TVA ANTN 68.4 312 iP :54.63 (-0.08 ) TVA TKL 81.7 98 P :57.00 ( 0.12X) eS :51:06.90 (-0.13X) TVA CRTN 89.4 56 iP- :58.27 ( 0.12 ) eS :09.25 ( 0.02 ) TVA LMTN 114.7 82 eP :51:02.81 ( 0.62X) eS :15.81 (-0.40X) TVA PDTN 119.8 244 eP :03.00 ( 0.05 ) eS :14.50 (-3.03X) TVA BBG 125.3 141 eP :03.50 (-0.38X) eS :21.00 ( 1.87X) TVA ABTN 130.9 277 iP :04.85 ( 0.20X) TVA LKGA 145.6 210 eP :07.27 ( 0.35X) eS :25.01 ( 0.61X) TVA FDKY 152.8 319 eP :08.29 ( 0.29 ) eS :27.00 ( 0.74 ) TVA BRTN 175.3 67 eP :12.39 ( 0.91X) eS :33.93 ( 1.64X) TVA MSAL 208.5 242 eP+ :16.25 (-0.27X) eS :41.89 ( 0.89X) TVA HAKY 227.8 312 eP :19.65 ( 0.18X) eS :47.45 ( 1.34X) TVA SLTN 241.7 71 eP :22.21 ( 0.80X) eS :49.95 ( 0.48X) TVA TCT 261.9 277 eP :24.63 ( 0.89X) eS :55.71 ( 2.22X) TVA LAL 284.0 240 eP :27.45 ( 1.00X) eS :52:02.77 ( 4.58X) TVA MOTN 313.3 289 eP :33.17 ( 3.15X) eS :09.41 ( 5.05X) ***** 1991 MAY 10; 19:40 - NICKAJACK GAP, GEORGIA ***** CERI/TVA This event is an earthquake. GIT This event is probably a blast. SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I TVA 910510 194036.6 34.865 85.201 11.2 18 18 133 0.1 B A/B 0.4 81 0.3 0.6 A 2.2 CERI 910510 194036.6 34.865 85.201 11.2 17 18 133 0.3 C C/B 0.8 -64 0.6 1.6 B 2.3 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) TVA RCG 18.2 312 iPc 19:40:40.40 ( 0.11 ) iS 19:40:42.88 (-0.12 ) TVA LKGA 36.5 223 iP :43.21 ( 0.06 ) iS :47.82 (-0.12 ) TVA GMG 48.5 90 eP :45.40 ( 0.29 ) eS :51.16 (-0.18 ) TVA PDTN 74.5 308 eP :49.27 (-0.05 ) eS :58.65 ( 0.03 ) TVA TQTN 84.2 31 eP :51.00 ( 0.20 ) eS :41:00.88 (-0.29 ) TVA ETT 85.1 53 iPd :50.78 (-0.18 ) eS :01.62 ( 0.16 ) TVA BHT 111.4 12 eP :55.40 ( 0.38X) eS :08.80 ( 0.33 ) TVA GBTN 126.6 45 eS :13.08 ( 0.68X) TVA BBG 127.1 89 eP- :57.74 ( 0.28 ) eS :12.32 (-0.38 ) TVA MSAL 134.7 270 eS :14.60 ( 0.06 ) TVA ABTN 140.1 324 eP :59.46 ( 0.09 ) eS :15.92 (-0.08 ) TVA TKL 156.9 55 eP :41:02.10 ( 0.17X) eS :20.94 ( 0.51X) CERI RCG 18.1 312 iPc 19:40:40.40 ( 0.12 ) iS 19:40:42.88 (-0.10 ) CERI LKGA 36.5 223 iP :43.21 ( 0.07 ) iS :47.82 (-0.11 ) CERI GMG 48.5 90 eP :45.40 ( 0.28 ) eS :51.16 (-0.19 ) CERI TQTN 84.2 31 eP :51.00 ( 0.21 ) eS :41:00.88 (-0.28 ) CERI ETT 85.1 53 iPd :50.78 (-0.18 ) eS :01.62 ( 0.16 ) CERI BHT 111.4 12 eP :55.40 ( 0.39X) eS :08.80 ( 0.34 ) CERI GBTN 126.6 45 eS :13.08 ( 0.68X) CERI BBG 127.1 89 eP- :57.74 ( 0.28 ) eS :12.32 (-0.38 ) CERI MSAL 134.7 270 eS :14.60 ( 0.06 ) CERI ABTN 140.1 324 eP :59.46 ( 0.10 ) eS :15.92 (-0.07 ) CERI ANTN 145.0 359 eP :49.27 (-10.9 ) eS :58.65 (-18.7X) CERI TKL 156.9 55 eP :41:02.10 ( 0.17X) eS :20.94 ( 0.50X) Additional Data: GIT DALG P 19:40:40.9 S 19:40:43.0 GIT CDG P :46.8 S :53.1 ***** 1991 MAY 17; 12:27 - MIDDLETON PLACE, SOUTH CAROLINA ***** CSU Magnitude 1.43. USGS NOTE: Fault Plane Solution (strike, dip, rake) Nodal Plane: 260.0 80.0 10.0 Nodal Plane: 168.2 80.2 169.8 P Axis: -145.9 89.9 T Axis: 124.1 75.9 SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I USC 910517 122753.2 32.942 80.131 5.7 7 5 136 0.0 0.6 360 0.6 1.8 1.4 USGS 910517 122753.4 32.940 80.145 1.0 12 5 0.2 1.3 0 0.8 1.5 1.4 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC MGS 5.0 191 iPd 12:27:54.76 (-0.03 ) USC RGR 7.1 237 iPd :55.02 ( 0.00 ) USC BCS 7.4 55 iPd :55.28 ( 0.03 ) USC SVS 11.3 285 iPc :55.77 ( 0.03 ) USC WAS 16.9 232 iPd :56.62 ( 0.03 ) USC HBF 18.8 272 iPd :56.79 (-0.10 ) USC TWB 19.3 7 iPd :57.07 (-0.03 ) USC SGS 45.0 309 eP+ :28:02.15 ( 0.72X) USGS MGS 4.8 175 iPd 12:27:54.23 (-0.45 ) S 12:27:55.91 ( 0.07 ) USGS RGR 6.0 229 iPd :55.00 ( 0.07 ) S :55.85 (-0.10 ) USGS BCS 9.0 59 iPd :55.28 (-0.21 ) S :56.88 (-0.08 ) USGS SVS 10.2 288 iPc :55.80 ( 0.00 ) S :57.10 (-0.24 ) USGS TWB 19.8 11 eP- :57.05 (-0.22 ) S :59.38 (-0.24 ) USGS HBF 21.8 267 eP- :56.88 (-0.36 ) S :58.98 (-0.45 ) ***** 1991 MAY 19; 01:44 - CHARLESTON, TENNESSEE ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 910519 014429.1 35.312 84.798 19.7 13 18 80 0.2 B B/A 0.9 -11 0.6 1.7 B 0.7 TVA 910519 014429.5 35.362 84.816 15.4 5 19 203 0.0 D C/D 2.1 -42 0.5 2.2 B 1.2 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI WMTN 17.5 246 iP 01:44:33.65 ( 0.14 ) iS 01:44:36.70 (-0.03 ) CERI TQTN 23.6 16 iP :33.60 (-0.61 ) CERI ETT 31.2 87 iPd :35.44 ( 0.19 ) eS :39.94 ( 0.19 ) CERI GMG 51.1 167 iP :38.12 (-0.07 ) eS :44.52 (-0.31 ) CERI BHT 60.9 347 iPc :39.78 ( 0.15 ) CERI GBTN 66.2 53 eS :48.64 ( 0.02 ) CERI PDTN 95.8 268 eP :45.00 ( 0.11 ) eS :56.40 (-0.03 ) CERI TKL 100.6 67 eS :56.88 (-0.82 ) CERI BBG 102.2 118 eS :57.66 (-0.63 ) CERI ABTN 134.8 299 eP :45.70 (-5.16X) TVA TQTN 18.9 26 iP 01:44:33.60 ( 0.00 ) TVA WMTN 19.1 228 iP :33.65 ( 0.01 ) iS 01:44:36.70 ( 0.00 ) TVA PDTN 94.5 264 eP :45.00 (-0.02 ) eS :56.40 ( 0.01 ) TVA ANTN 97.3 337 eS :45:16.08 TVA ABTN 130.7 297 eP :45.70 (-4.87X) TVA LMTN 140.0 65 eP :37.36 ***** 1991 MAY 20; 10:05 - VILLANOW, GEORGIA ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I TVA 910520 100524.0 34.730 85.101 6.0 12 35 182 0.3 D C/D 0.6 -31 0.2 3.7 C 1.1 CERI 910520 100524.1 34.742 85.112 6.8 11 34 177 0.2 C C/C 1.0 -28 0.4 14.5 D 0.9 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) TVA RCG 35.4 320 eP+ 10:05:30.58 ( 0.32 ) TVA LKGA 36.0 251 iP :30.44 ( 0.06 ) iS 10:05:34.87 (-0.16 ) TVA GMG 42.0 69 iPd :31.66 ( 0.26 ) eS :37.10 ( 0.31 ) TVA WMTN 58.7 11 iS :41.21 (-0.26 ) TVA ETT 88.6 41 eP- :38.78 (-0.28 ) eS :49.54 (-0.51 ) TVA PDTN 91.2 312 eP :39.20 (-0.28 ) eS :51.70 ( 0.94 ) TVA TQTN 93.7 21 eP :41.16 ( 1.27X) TVA BBG 119.1 82 eS :57.74 (-0.83X) TVA BHT 124.8 6 eS :06:00.50 ( 0.51 ) TVA ABTN 157.7 325 eP :50.00 ( 0.19 ) CERI RCG 33.7 320 eP+ 10:05:30.58 ( 0.53 ) CERI LKGA 35.6 248 iP :30.44 ( 0.06 ) iS 10:05:34.87 (-0.11 ) CERI GMG 42.5 72 iPd :31.66 ( 0.10 ) eS :37.10 ( 0.09 ) CERI WMTN 57.5 13 iS :41.21 ( 0.00 ) CERI ETT 88.2 43 eP- :38.78 (-0.29 ) eS :49.54 (-0.47 ) CERI PDTN 89.5 311 eP :39.20 (-0.06 ) eS :51.70 ( 1.36 ) CERI TQTN 92.7 22 eP :41.16 ( 1.37X) CERI BBG 119.9 83 eS :57.74 (-1.02X) CERI BHT 123.5 7 eS :06:00.50 ( 0.87X) CERI ABTN 155.9 325 eP :50.00 ( 0.44 ) Additional Data: GIT DALG P 10:05:26.6 S 10:05:27.8 ***** 1991 MAY 26; 05:49 - RICEVILLE, TENNESSEE ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I TVA 910526 054927.2 35.486 84.631 16.3 10 24 92 0.1 C C/B 1.6 -29 0.3 3.9 C 1.0 CERI 910526 054927.3 35.488 84.633 15.3 10 24 95 0.1 B B/B 0.7 -30 0.2 1.9 B 0.9 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) TVA ETT 23.8 138 iPc 05:49:32.18 ( 0.03 ) eS 05:49:35.72 (-0.02 ) TVA WMTN 40.8 230 iP :34.60 (-0.01 ) iS :40.00 ( 0.01 ) TVA GBTN 43.0 62 iPd :34.98 ( 0.04 ) eS :40.54 (-0.02 ) TVA BHT 49.2 325 eP :35.86 (-0.06 ) TVA TKL 80.0 76 eS :50.26 (-0.09 ) TVA CRTN 106.7 42 eP :45.00 ( 0.31 ) eS :50:03.50 ( 6.07X) TVA PDTN 113.2 258 eP :39.70 (-5.98X) eS :49:58.90 (-0.25 ) CERI ETT 24.2 138 iPc 05:49:32.18 ( 0.03 ) eS 05:49:35.72 ( 0.00 ) CERI WMTN 40.9 229 iP :34.60 (-0.02 ) iS :40.00 ( 0.01 ) CERI GBTN 43.0 63 iPd :34.98 ( 0.03 ) eS :40.54 (-0.02 ) CERI BHT 48.8 325 eP :35.86 (-0.02 ) CERI TKL 80.1 76 eS :50.26 (-0.12 ) CERI CRTN 106.5 42 eP :45.00 ( 0.32 ) eS :50:03.50 ( 6.10X) CERI PDTN 113.1 258 eP :39.70 (-5.98X) eS :49:58.90 (-0.22 ) ***** 1991 MAY 28; 23:44 - HEWITT, NORTH CAROLINA ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 910528 234409.0 35.310 83.628 2.6 19 41 114 0.4 C C/C 1.2 -62 0.8 3.4 C 2.2 TVA 910528 234409.1 35.311 83.619 0.0 24 41 115 0.5 C C/C 0.4 -47 0.4 1.1 A 2.3 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI TKL 40.9 341 eP+ 23:44:16.32 ( 0.02 ) eS 23:44:21.22 (-0.39 ) CERI BBG 51.2 199 eP+ :17.98 (-0.17 ) eS :23.92 (-0.89 ) CERI RBNC 58.6 85 iPc :19.64 ( 0.24 ) CERI GBTN 66.0 307 eP+ :20.58 ( 0.05 ) eS :29.32 ( 0.40X) CERI LMTN 66.9 17 eP :20.54 (-0.16 ) eS :28.60 (-0.62 ) CERI ETTZ 75.2 272 eP :22.28 ( 0.21 ) CERI ORT 90.5 317 eP :26.00 ( 1.43 ) eS :38.70 ( 2.78X) CERI RICH 99.7 47 eP+ :26.36 ( 0.23 ) CERI CRTN 100.6 349 eP :26.60 ( 0.35 ) CERI GMG 107.3 243 eP- :27.32 (-0.07 ) CERI WMTN 122.6 267 eP :30.40 ( 0.66 ) eS :48.50 ( 3.64X) CERI SMTN 125.5 19 eP :30.60 ( 0.37X) CERI TRYN 125.8 92 eP :30.86 ( 0.58X) CERI BRBC 130.7 68 eP- :31.26 ( 0.14 ) CERI BHT 133.4 297 eP :31.90 ( 0.46X) CERI SLTN 185.3 47 eP :39.10 (-0.22 ) eS :45:06.00 ( 4.57X) CERI GFM 187.2 61 eP- :40.34 ( 0.58 ) eS :02.92 ( 0.73 ) CERI PKNC 238.1 69 eP :47.34 (-0.12X) eS :15.50 (-0.02 ) CERI PLVA 268.6 55 eP- :51.28 (-0.53X) eS :23.16 ( 0.12X) TVA TKL 41.1 340 ePc 23:44:16.32 (-0.04 ) eS 23:44:21.22 (-0.46 ) TVA BBG 51.5 200 ePc :17.98 (-0.24 ) eS :23.92 (-0.98 ) TVA RBNC 57.7 85 iPc :19.64 ( 0.32 ) TVA LMTN 66.7 16 eP :20.54 (-0.32 ) eS :28.60 (-0.88 ) TVA GBTN 66.7 306 eP+ :20.58 (-0.26 ) eS :29.32 (-0.13 ) TVA ETT 76.1 272 eP :22.28 (-0.14 ) TVA ORT 91.0 317 eP :26.00 ( 1.13 ) eS :38.70 ( 2.29X) TVA RICH 99.0 47 ePc :26.36 ( 0.12 ) TVA CRTN 100.7 349 eP :26.60 ( 0.12 ) TVA GMG 108.0 243 eP- :27.32 (-0.41 ) TVA WMTN 123.4 267 eP :30.40 ( 0.26 ) eS :48.50 ( 2.97X) TVA TRYN 125.0 92 eP :30.86 ( 0.44X) TVA SMTN 125.3 18 eP :30.60 ( 0.14 ) TVA BRBC 129.9 68 eP- :31.26 (-0.01 ) TVA BHT 134.2 297 eP :31.90 ( 0.07 ) TVA SLTN 184.6 47 eP :39.10 (-0.50 ) eS :45:06.00 ( 4.11X) TVA GFM 186.4 61 eP- :40.34 ( 0.43 ) eS :02.92 ( 0.49 ) TVA PKNC 237.3 69 eP :47.34 (-0.27 ) eS :15.50 (-0.25 ) TVA PLVA 267.9 55 ePd :51.28 (-0.22 ) eS :23.16 ( 0.68X) ***** 1991 MAY 29; 02:47 - MT. VERNON, TENNESSEE ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 910529 024718.9 35.415 84.292 21.6 31 18 66 0.2 B B/A 0.4 -37 0.2 0.9 A 2.9 TVA 910529 024718.9 35.410 84.288 20.6 17 18 66 0.2 B B/A 0.4 -26 0.2 1.0 A 2.7 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI ETT 17.8 237 iPd 02:47:23.68 ( 0.12 ) eS 02:47:26.76 (-0.22 ) CERI GBTN 28.9 15 iPd :25.02 ( 0.20 ) iS :29.12 (-0.04 ) CERI TKL 54.2 60 iPd :28.50 ( 0.09 ) iS :35.30 (-0.08 ) CERI ORT 54.9 359 eP :28.20 (-0.32 ) eS :35.40 (-0.17 ) CERI WMTN 64.7 254 iP :30.05 ( 0.07 ) iS :37.90 (-0.19 ) CERI GMG 70.3 210 eP- :30.78 (-0.11 ) eS :39.66 (-0.01 ) CERI BBG 74.3 144 iPc :31.64 ( 0.13 ) eS :40.06 (-0.69 ) CERI BHT 76.2 309 eP+ :32.12 ( 0.36 ) CERI LMTN 95.5 56 eP :34.30 (-0.37 ) eS :46.20 ( 0.00 ) CERI CRTN 96.2 25 iP :34.40 (-0.36 ) CERI RCG 107.9 243 eP :36.66 ( 0.13 ) eS :49.36 (-0.07X) CERI RBNC 118.8 93 iPc :38.46 ( 0.12 ) eS :52.48 (-0.07 ) CERI ANTN 119.5 315 iP :38.60 ( 0.27 ) CERI LKGA 139.0 231 eP :41.15 (-0.16 ) eS :57.70 ( 0.00 ) CERI CCVA 143.4 23 eP :42.34 ( 0.37X) CERI RICH 144.6 67 eP :42.42 ( 0.22 ) eS :59.38 ( 0.14X) CERI SMTN 146.8 43 eP :42.54 ( 0.02 ) CERI BRTN 165.7 50 eS :48:06.20 ( 1.44X) CERI ABTN 172.7 288 iP :47.05 ( 0.61 ) CERI BRBC 185.3 78 eP+ :48.94 ( 0.42 ) eS :10.84 ( 0.67 ) CERI TRYN 186.7 94 eP+ :49.00 ( 0.37 ) eS :11.04 ( 0.68 ) CERI FDKY 204.0 319 eP :51.40 ( 0.18X) CERI MSAL 226.1 255 eP :54.40 ( 0.13X) eS :11.50 (-8.62X) CERI SLTN 226.7 59 iP :54.30 (-0.04X) iS :22.50 ( 2.26X) CERI GFM 237.6 70 eP+ :55.40 (-0.47X) CERI HAKY 278.7 313 eP :48:02.60 ( 1.92X) eS :35.40 ( 4.20X) CERI LAL 298.7 250 eP :03.80 ( 0.64X) eS :39.70 ( 4.21X) CERI PLVA 314.5 63 eP :04.50 (-0.72X) eS :38.54 (-0.53X) TVA ETT 17.8 239 iPd 02:47:23.68 ( 0.17 ) eS 02:47:26.76 (-0.09 ) TVA GBTN 29.3 14 iPd :25.02 ( 0.16 ) iS :29.12 (-0.07 ) TVA TKL 54.2 59 iP :28.59 ( 0.16 ) iS :35.10 (-0.27 ) TVA ORT 55.5 358 eP :28.20 (-0.43 ) eS :35.40 (-0.32 ) TVA WMTN 64.8 254 iP :30.05 ( 0.01 ) iS :37.90 (-0.25 ) TVA GMG 70.0 210 ePd :30.78 (-0.10 ) eS :39.66 ( 0.05 ) TVA BBG 73.6 144 iPc :31.64 ( 0.18 ) eS :40.06 (-0.54 ) TVA BHT 76.8 309 ePc :32.12 ( 0.23 ) TVA LMTN 95.5 56 eP :34.30 (-0.43X) eS :46.20 (-0.07X) TVA CRTN 96.6 25 iP :34.40 (-0.47X) TVA RCG 107.9 244 eP :36.66 ( 0.06X) eS :49.36 (-0.15X) TVA RBNC 118.4 92 iPc :38.46 ( 0.12 ) eS :52.48 (-0.02 ) TVA ANTN 120.1 315 iP :38.60 ( 0.12X) TVA LKGA 138.9 231 eP :41.15 (-0.20X) eS :57.70 (-0.02X) TVA PDTN 142.8 264 eP :24.50 TVA CCVA 143.8 23 eP :42.34 ( 0.25X) TVA RICH 144.5 67 eP :42.42 ( 0.17X) eS :59.38 ( 0.11X) TVA SMTN 147.0 42 eP :42.54 (-0.07X) TVA BRTN 165.8 50 eP :56.20 eS :48:06.20 ( 1.36X) TVA ABTN 173.2 288 iP :47.05 ( 0.48X) TVA BRBC 185.1 78 eP+ :48.94 ( 0.39X) eS :10.84 ( 0.67X) TVA TRYN 186.3 94 eP+ :49.00 ( 0.36X) eS :11.04 ( 0.72X) TVA FDKY 204.6 319 eP :51.40 ( 0.18X) TVA MSAL 226.2 255 eP :54.40 ( 0.54X) eS :11.50 (-7.86X) TVA SLTN 226.8 59 iP :54.30 ( 0.24X) iS :22.50 ( 2.80X) TVA GFM 237.5 70 eP+ :55.40 (-0.03X) TVA HAKY 279.3 313 eP :48:02.60 ( 2.26X) eS :35.40 ( 4.82X) TVA LAL 298.8 250 eP :03.80 ( 1.06X) eS :39.70 ( 4.98X) TVA TCT 302.7 284 eP :03.80 eS :37.60 TVA PLVA 314.5 63 eP :04.50 (-0.29X) eS :38.54 ( 0.27X) ***** 1991 JUNE 2; 06:05 - SUMMERVILLE, SOUTH CAROLINA ***** CSU Felt (V); Jedburg/Knightsville/Summerville residents reported being awakened. Magnitude 2.0. USGS NOTE: Fault Plane Solution (strike, dip, rake) Nodal Plane: 85.0 55.0 -20.0 Nodal Plane: 186.8 73.7 -143.3 P Axis: 51.5 52.9 T Axis: -47.8 78.0 SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I USC 910602 060534.7 32.981 80.216 5.9 8 8 112 0.1 0.4 360 0.4 2.5 2.0 USGS 910602 060534.9 32.980 80.214 5.0 17 8 0.1 0.8 0 0.8 3.9 1.7 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC RGR 8.4 166 iPc 06:05:36.68 (-0.03 ) USC MGS 11.6 143 iPc :37.33 ( 0.08 ) USC BCS 14.0 90 iPc :37.76 (-0.03 ) USC WAS 15.8 200 iPd :37.91 ( 0.01 ) USC TWB 18.2 35 iPd :38.31 (-0.07 ) USC DRC 21.4 312 iPc :38.90 ( 0.00 ) USC HWD 27.7 194 iPc :39.85 (-0.07 ) USC CFS 33.3 7 iPc :41.05 ( 0.17 ) USC SGS 36.1 311 iPc :41.25 (-0.12X) USC VRN 67.8 276 eP- :46.40 (-0.10X) USGS RGR 8.4 167 iPc 06:05:36.68 (-0.14 ) S 06:05:38.41 ( 0.10 ) USGS MGS 11.3 143 iPc :37.27 (-0.06 ) S :41.02 ( 0.96 ) USGS BCS 14.2 89 iPc :37.78 ( 0.05 ) S :40.11 ( 0.12 ) USGS WAS 15.6 200 iPd :37.90 (-0.04 ) S :40.45 ( 0.17 ) USGS TWB 18.3 34 eP- :38.24 (-0.10 ) USGS DRC 21.8 311 iPc :38.92 (-0.17 ) S :42.50 ( 0.17 ) USGS HWD 27.4 193 eP- :40.11 ( 0.07 ) S :43.92 ( 0.16 ) USGS CFS 33.5 6 eP+ :41.02 ( 0.06 ) S :45.91 ( 0.27 ) USGS SGS 36.7 310 eP+ :41.59 ( 0.00 ) S :44.83 (-0.55 ) ***** 1991 JUNE 13; 06:14 - BEAVERDALE, GEORGIA ***** CERI/TVA This event is an earthquake. GIT This event is probably a blast. SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I TVA 910613 061452.3 34.967 84.851 13.2 19 20 141 0.5 C C/C 0.4 18 0.3 0.6 A 1.8 CERI 910613 061452.8 34.965 84.808 14.7 10 17 263 0.2 D C/D 2.5 63 1.0 2.2 B 1.4 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) TVA GMG 20.1 125 iPc 06:14:56.78 ( 0.22 ) TVA WMTN 33.2 340 iP :58.50 ( 0.05 ) iS 06:15:02.50 (-0.40 ) TVA ETT 53.8 42 iPc :15:01.94 ( 0.18 ) eS :08.30 (-0.33 ) TVA BBG 95.6 96 eP :07.80 (-0.48 ) eS :19.28 (-0.62 ) TVA GBTN 97.0 37 eP :07.82 (-0.59 ) eS :19.48 (-0.65X) TVA PDTN 97.2 291 eP :08.50 ( 0.07 ) eS :19.30 (-0.87 ) TVA WSSR 121.1 73 eP :12.20 ( 0.02 ) eS :26.66 ( 0.01 ) TVA TKL 124.4 52 eP :12.40 (-0.20 ) eS :27.72 ( 0.33 ) TVA ANTN 138.1 346 eP :15.53 ( 0.81 ) eS :32.42 ( 1.37 ) TVA ABTN 153.1 312 eP :17.32 ( 0.32 ) eS :36.08 ( 1.08 ) TVA CRTN 164.7 33 eP :20.00 ( 1.22X) eS :44.10 ( 6.03X) TVA MSAL 167.1 266 eS :38.30 (-0.38 ) CERI GMG 17.0 132 iPc 06:14:56.78 ( 0.00 ) CERI ETT 51.4 39 iPc :15:01.94 ( 0.11 ) eS 06:15:08.30 (-0.09 ) CERI BBG 91.7 96 eP :07.80 (-0.27 ) eS :19.28 ( 0.08 ) CERI GBTN 94.9 35 eP :07.82 (-0.65 ) eS :19.48 (-0.40X) CERI WSSR 117.4 72 eP :12.20 ( 0.19 ) eS :26.66 ( 0.65 ) CERI TKL 121.5 50 eP :12.40 (-0.15 ) eS :27.72 ( 0.78 ) Additional Data: GIT DALG P 06:14:57.1 ***** 1991 JUNE 13; 22:46 - TRANQUILLITY, TENNESSEE ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 910613 224602.8 35.569 84.734 13.6 18 36 80 0.1 B A/C 0.2 36 0.2 0.5 A 1.0 TVA 910613 224602.8 35.571 84.733 12.9 18 36 81 0.1 B A/C 0.4 -4 0.3 0.7 A 1.3 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI BHT 36.3 328 eP 22:46:09.42 ( 0.02 ) eS 22:46:14.34 ( 0.08 ) CERI ETT 37.0 137 iPc :09.60 ( 0.10 ) eS :14.40 (-0.01 ) CERI WMTN 41.7 211 iPd :10.22 ( 0.00 ) iSd :15.58 (-0.09 ) CERI GBTN 48.6 77 eP :11.74 ( 0.41X) eS :17.50 (-0.09 ) CERI GMG 78.5 176 eP :16.54 ( 0.52X) CERI ANTN 80.6 326 iP :16.21 (-0.08 ) eS :25.93 (-0.24 ) CERI TKL 87.6 83 eS :27.92 (-0.07 ) CERI PDTN 106.5 252 eS :33.42 ( 0.44 ) CERI CRTN 106.8 49 eP :20.50 ( 0.20 ) eS :33.50 ( 0.39 ) CERI WSSR 109.9 107 eP :21.04 ( 0.19 ) eS :33.88 (-0.17 ) CERI BBG 114.0 132 eP :21.66 ( 0.18 ) CERI ABTN 129.2 286 eP :23.74 ( 0.02 ) eS :39.38 ( 0.35 ) TVA BHT 36.2 328 eP 22:46:09.42 ( 0.05 ) eS 22:46:14.34 ( 0.16 ) TVA ETT 37.1 137 iPc :09.60 ( 0.11 ) eS :14.40 ( 0.01 ) TVA WMTN 41.9 211 iPd :10.22 (-0.02 ) iSd :15.58 (-0.12 ) TVA GBTN 48.5 77 eP :11.74 ( 0.44X) eS :17.50 (-0.03 ) TVA GMG 78.7 176 eP :16.54 ( 0.43X) TVA ANTN 80.5 326 iP :16.21 (-0.12 ) eS :25.93 (-0.30 ) TVA TKL 87.4 83 eS :28.00 (-0.04 ) TVA PDTN 106.6 252 eS :33.42 ( 0.30 ) TVA CRTN 106.6 49 eP :20.50 ( 0.17 ) eS :33.50 ( 0.35 ) TVA WSSR 109.8 107 eP :21.04 ( 0.15 ) eS :33.88 (-0.24 ) TVA BBG 114.1 132 eP :21.66 ( 0.11 ) TVA ABTN 129.3 286 eP :23.74 (-0.05 ) eS :39.38 ( 0.25 ) ***** 1991 JUNE 16; 08:04 - JOHNSON CITY, TENNESSEE ***** TVA Event could be related to quarry activity nearby. SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 910616 080418.5 36.375 82.303 1.0 16 18 163 0.2 C C/C 1.0 56 0.7 3.0 C 1.9 TVA 910616 080418.5 36.374 82.299 1.6 9 18 162 0.2 C B/C 1.0 6 0.5 2.5 B 2.0 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI SLTN 18.1 65 iP 08:04:21.60 (-0.14 ) CERI GFM 53.3 123 eP- :28.40 ( 0.40 ) eS 08:04:34.88 (-0.04 ) CERI RICH 68.6 223 eP- :30.40 (-0.19 ) eS :39.34 (-0.07X) CERI BRBC 70.5 179 eP+ :31.12 ( 0.14 ) eS :39.82 (-0.25 ) CERI BENN 106.9 147 eP :36.46 (-0.45X) CERI PLVA 107.4 72 eP :36.96 (-0.07 ) CERI PKNC 109.3 109 eP+ :37.52 ( 0.21 ) CERI LMTN 113.3 242 eP :40.70 ( 2.73X) eS :58.28 ( 6.12X) CERI TRYN 123.0 178 eP :39.78 ( 0.29 ) CERI RBNC 128.6 209 eP :40.52 ( 0.09 ) CERI CRTN 139.5 262 eP :42.25 ( 0.28 ) eS :05:03.25 ( 4.16X) CERI TKL 154.5 240 eP :44.82 ( 0.55 ) CERI WSSR 167.5 224 eP :47.00 ( 0.65 ) CERI ORT 187.4 255 eP :50.40 ( 1.10X) eS :13.80 ( 2.03X) CERI GBTN 189.0 246 eP :50.22 ( 0.67 ) eS :13.12 ( 0.92X) CERI BBG 215.3 220 eP :54.38 ( 0.71 ) CERI ETT 226.5 240 eP- :56.02 ( 0.71 ) eS :22.28 ( 0.11X) CERI BHT 244.9 257 eP :58.42 ( 0.27X) CERI ANTN 264.0 266 eP :05:00.50 (-0.35X) eS :33.60 ( 1.84X) CERI WMTN 271.7 243 eP :01.60 (-0.16X) eS :32.48 (-0.85X) CERI GMG 272.2 233 eP :02.66 ( 0.74X) CERI LKGA 347.0 237 eP :14.00 ( 3.00X) eS :50.30 ( 0.99X) TVA SLTN 17.8 64 iP 08:04:21.60 (-0.09 ) TVA GFM 53.0 123 eP- :28.40 ( 0.39 ) eS 08:04:34.88 (-0.07 ) TVA RICH 68.8 223 eP- :30.40 (-0.18 ) eS :39.34 (-0.05 ) TVA BRBC 70.4 179 eP+ :31.12 ( 0.21 ) eS :39.82 (-0.15 ) TVA BENN 106.6 147 eP :36.46 (-0.36 ) TVA PLVA 107.0 72 eP :36.96 ( 0.04X) TVA PKNC 108.9 109 eP+ :37.52 ( 0.33X) TVA LMTN 113.7 242 eP :40.70 ( 2.73X) eS :58.28 ( 6.10X) TVA TRYN 122.9 178 eP :39.78 ( 0.37X) TVA RBNC 128.7 209 eP :40.52 ( 0.13X) TVA CRTN 139.8 263 eP :42.25 ( 0.28 ) eS :05:03.25 ( 4.15X) TVA TKL 154.9 240 iP :44.20 (-0.06X) iS :07.60 ( 4.54X) TVA WSSR 167.7 224 eP :47.00 ( 0.68X) TVA ORT 187.7 255 eP :50.40 ( 1.11X) eS :13.80 ( 2.03X) TVA GBTN 189.4 246 eP :50.22 ( 0.68X) eS :13.12 ( 0.92X) TVA BBG 215.5 220 eP :54.38 ( 0.75X) TVA ETT 226.8 240 eP- :56.02 ( 0.72X) eS :22.28 ( 0.13X) TVA BHT 245.3 257 eP :58.42 ( 0.50X) TVA ANTN 264.4 266 eP :05:00.50 ( 0.27X) eS :33.60 ( 2.91X) TVA WMTN 272.0 243 eP :01.60 ( 0.47X) eS :32.48 ( 0.23X) TVA GMG 272.5 233 eP :02.66 ( 1.38X) TVA LKGA 347.2 237 eP :14.00 ( 3.64X) eS :50.30 ( 2.09X) ***** 1991 JUNE 20; 07:20 - CONCORD, TENNESSEE ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I TVA 910620 072048.3 35.748 84.190 28.7 12 9 95 0.2 B B/B 0.7 -58 0.3 1.0 A 0.3 CERI 910620 072048.8 35.756 84.202 23.2 13 10 97 0.3 C C/B 1.2 -52 0.7 2.3 B -.1 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) TVA GBTN 9.3 192 iPc 07:20:53.34 ( 0.14 ) eS 07:20:55.50 (-1.30X) TVA ORT 20.7 330 eP :52.59 (-1.46X) eS :57.25 (-1.02X) TVA TKL 38.9 105 eP :55.89 (-0.22 ) eS :21:01.03 (-0.81X) TVA ETT 52.6 207 eP :58.24 ( 0.27 ) eS :04.90 (-0.17 ) TVA CRTN 59.2 32 iP :58.80 (-0.10 ) eS :06.70 ( 0.04 ) TVA BHT 69.1 279 eS :09.48 ( 0.29 ) TVA WSSR 76.2 133 eP :21:02.36 ( 0.93X) eS :11.38 ( 0.33 ) TVA BBG 102.9 160 eS :18.12 ( 0.17 ) TVA ANTN 105.1 297 eP :05.45 (-0.23 ) eS :18.05 (-0.34 ) TVA GMG 107.5 204 eS :19.92 ( 0.82X) TVA ABTN 174.1 276 eS :36.49 ( 0.10 ) CERI GBTN 9.9 185 iPc 07:20:53.34 ( 0.39 ) eS 07:20:55.50 (-0.51 ) CERI ORT 19.5 331 eP :52.59 (-1.19X) eS :57.25 (-0.18X) CERI TKL 40.2 105 eP :56.88 ( 0.51 ) eS :21:01.64 (-0.28 ) CERI ETT 52.9 206 eP :58.24 ( 0.03 ) eS :04.90 (-0.20 ) CERI CRTN 59.1 33 iP :58.80 (-0.30 ) eS :06.70 ( 0.05 ) CERI BHT 67.9 279 eS :09.48 ( 0.48 ) CERI WSSR 77.5 133 eP :21:02.36 ( 0.40 ) eS :11.38 (-0.21X) CERI ANTN 103.7 297 eP :05.45 (-0.40 ) eS :18.05 (-0.27 ) CERI BBG 104.1 160 eS :18.12 (-0.41X) CERI GMG 107.8 203 eS :19.92 ( 0.44X) CERI ABTN 173.0 275 eS :36.49 (-0.08 ) ***** 1991 JUNE 28; 18:34 - CHARLESTON, WEST VIRGINIA ***** NEIC Felt at Charleston, West Virginia. Standard deviation 0.9 on 14 of 15 observations. WVGS Felt in Charleston, WV, area. SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I NEIC 910628 183451.9 38.276 81.668 5.0F 14 106 8.6 90 6.2 3.2 F VTSO 910628 183455.5 38.231 81.335 7.0 17 83 290 0.5 D D/D 3.0 -89 2.1 2.9 C 3.0 F SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) NEIC HWV 105.6 136 P 18:35:09.90 (-0.5 ) NEIC PWV 117.9 152 P :13.00 ( 0.6 ) NEIC NAV 131.2 144 P :14.20 (-0.3 ) NEIC WMV 143.4 154 P :16.50 ( 0.1 ) NEIC VWV 143.4 128 P :15.30 (-1.1 ) NEIC BLA 161.2 137 P :18.30 (-0.6 ) NEIC CVL 283.6 96 eP :35.00 ( 0.4 ) NEIC FRV 314.7 111 P :40.20 ( 1.5 ) NEIC NA2 343.6 92 eP :42.00 (-0.3 ) NEIC TKL 345.8 213 eP :41.50 (-1.1 ) NEIC CLE 356.9 2 iP :52.00 ( 8.0X ) NEIC LHS 428.1 169 eP :54.00 ( 0.9 ) NEIC JSC 444.8 175 eP :56.00 ( 0.8 ) NEIC WVLY 534.9 28 ePc :36:07.50 ( 0.7 ) NEIC LVNJ 656.1 62 eP :21.00 (-1.2 ) VTSO HWV 83.3 148 ePc 18:35:09.80 ( 0.08 ) eS 18:35:19.89 ( 0.27 ) VTSO PWV 102.6 166 ePd :13.02 ( 0.14 ) eS :25.73 ( 0.71 ) VTSO NAV 112.2 155 eP :14.10 (-0.24 ) eS :26.33 (-1.17 ) VTSO VWV 118.8 135 eP :15.33 (-0.04 ) eS :28.83 (-0.41 ) VTSO WMV 128.7 165 iPd :16.65 (-0.25 ) eS :32.18 ( 0.34 ) VTSO BLA 139.0 144 eP :18.36 (-0.07 ) eS :34.69 ( 0.23 ) VTSO CVL 253.6 95 iPc :35.32 (-0.48 ) eS :36:04.74 ( 0.60 ) VTSO FRV 286.1 113 eP :40.17 ( 0.39 ) eS :14.09 ( 3.15X) VTSO GHV 287.6 99 eP :40.25 ( 0.31 ) eS :12.89 ( 1.66 ) ***** 1991 JULY 11; 00:26 - JOHN SEVIER, TENNESSEE ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 910711 002615.7 36.052 83.816 8.7 5 44 360 0.1 D D/D 4.7 9 2.3 4.9 C 0.9 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI TKL 43.8 175 eP 00:26:23.36 (-0.01 ) eS 00:26:28.94 (-0.02 ) CERI GBTN 55.7 220 eP :25.06 (-0.26X) eS :32.38 ( 0.04 ) CERI WSSR 88.6 166 eP :30.80 (-0.04X) eS :42.02 ( 0.13 ) CERI RICH 91.1 99 eS :38.32 (-4.18X) CERI ETT 99.2 216 eP :32.34 (-0.05X) eS :44.40 (-0.17 ) ***** 1991 JULY 14; 07:31 - SWEETWATER, TENNESSEE ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 910714 073156.0 35.562 84.423 14.1 6 23 127 0.1 C C/B 1.3 -50 0.7 1.2 A 1.2 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI GBTN 22.5 59 iPd 07:32:00.60 ( 0.04 ) eS 07:32:03.82 (-0.05 ) CERI ETT 26.3 186 eP :01.34 ( 0.19 ) eS :04.74 (-0.15 ) CERI BHT 56.8 304 eP :05.80 (-0.12 ) CERI TKL 59.8 79 eP :06.64 ( 0.31X) eS :13.84 (-0.01 ) CERI BBG 94.5 144 eP :12.14 ( 0.41X) eS :24.36 ( 1.16X) ***** 1991 JULY 18; 09:31 - FELKER, TENNESSEE ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 910718 093116.9 35.004 84.838 14.8 10 50 299 0.2 D C/D 1.5 75 1.1 81.6 D 1.8 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI ETT 50.0 44 iP- 09:31:25.50 (-0.16 ) eS 09:31:32.00 (-0.07 ) CERI GBTN 93.0 38 eP :32.50 ( 0.27 ) eS :43.50 ( 0.06 ) CERI BBG 94.9 98 eP :32.50 (-0.11 ) eS :44.00 (-0.10 ) CERI WSSR 118.8 75 eP :36.50 ( 0.23 ) eS :50.50 ( 0.07 ) CERI TKL 121.0 53 eP :37.00 ( 0.48 ) eS :51.50 ( 0.65 ) ***** 1991 JULY 23; 13:52 - NARROWS, VIRGINIA ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I VTSO 910723 135233.1 37.263 80.743 8.9 7 7 267 0.1 C B/D 0.8 -48 0.5 1.4 B 0.3 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) VTSO NAV 7.4 323 iPu 13:52:35.26 ( 0.07 ) eS? 13:52:36.44 (-0.14 ) VTSO WMV 26.5 230 iPd :37.89 (-0.09 ) S :41.35 ( 0.08 ) VTSO PWV 28.3 287 iS? :41.86 ( 0.13 ) VTSO HWV 37.4 347 S? :44.11 (-0.10 ) VTSO VWV 38.5 54 S? :44.62 ( 0.06 ) ***** 1991 JULY 26; 04:21 - FOUNT, KENTUCKY ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 910726 042145.2 36.919 83.849 17.3 11 140 273 0.3 D D/D 5.4 4 2.3 99.0 D 1.4 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI TKL 140.0 177 eP 04:22:08.10 ( 0.37 ) eS 04:22:23.76 (-0.42 ) CERI GBTN 142.8 193 eP- :08.18 ( 0.03 ) eS :25.30 ( 0.39 ) CERI BHT 154.4 220 eP :09.66 (-0.31 ) eS :27.86 (-0.19 ) CERI WSSR 183.7 172 eP :15.06 ( 0.53 ) eS :36.72 ( 0.77X) CERI ETT 185.0 197 eP+ :14.40 (-0.25 ) eS :36.26 ( 0.11 ) CERI RBNC 189.9 156 eS :37.60 (-0.05X) CERI BRBC 191.9 133 eP+ :15.90 ( 0.07 ) CERI BBG 226.9 179 eS :47.38 ( 0.00 ) ***** 1991 JULY 29; 15:33 - EAST CLEVELAND, TENNESSEE ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 910729 153321.6 35.133 84.820 13.5 13 33 247 0.2 C B/D 0.9 -78 0.4 0.8 A 1.7 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI GMG 33.0 156 eP 15:33:27.84 ( 0.12 ) eS 15:33:32.06 (-0.14 ) CERI ETT 39.5 57 eP :28.60 (-0.12 ) eS :33.98 ( 0.06 ) CERI BHT 80.0 352 eP :35.12 ( 0.06X) eS :44.72 (-0.17 ) CERI GBTN 81.0 43 eP :35.12 (-0.04 ) eS :45.12 ( 0.05 ) CERI BBG 96.5 107 eP :37.92 ( 0.29 ) eS :48.98 (-0.35 ) CERI TKL 111.5 58 eP :40.12 ( 0.29 ) eS :52.96 (-0.19 ) CERI WSSR 114.2 82 eP :40.68 ( 0.33 ) eS :54.00 (-0.04 ) ***** 1991 JULY 31; 07:44 - ISABELLA, TENNESSEE ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 910731 074414.1 35.014 84.360 11.4 8 33 132 0.2 C C/C 1.5 53 0.7 2.1 B 0.4 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI GMG 33.0 239 eP 07:44:19.82 (-0.32 ) eS 07:44:24.06 (-0.49X) CERI ETT 35.7 346 iPd :20.80 ( 0.27 ) eS :25.06 (-0.16 ) CERI BBG 52.5 107 eP :23.40 ( 0.08 ) eS :29.94 (-0.10 ) CERI GBTN 73.6 11 eP- :26.84 ( 0.16 ) eS :35.80 (-0.06 ) CERI WSSR 77.0 67 eS :36.64 (-0.29 ) CERI TKL 89.2 37 eS :41.92 ( 1.93X) ***** 1991 AUGUST 17; 17:59 - HOOKER, GEORGIA ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 910817 175909.7 34.922 85.458 20.5 16 12 289 0.2 C B/D 1.2 53 0.9 1.3 B 2.7 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI RCG 11.7 59 iPd 17:59:13.66 ( 0.00 ) eS 17:59:16.46 (-0.11X) CERI GMG 72.3 95 eP :22.20 ( 0.21 ) eS :30.80 (-0.17 ) CERI ETT 101.8 64 iP- :26.36 (-0.08 ) eS :38.82 ( 0.14 ) CERI BHT 112.8 24 eP :26.68 (-1.45 ) eS :41.64 ( 0.04 ) CERI GBTN 140.3 54 iP- :32.22 (-0.08 ) eS :49.64 ( 0.83X) CERI BBG 150.6 92 eP- :33.98 ( 0.01 ) eS :51.48 (-0.22 ) CERI TKL 173.7 61 eP+ :37.26 (-0.14 ) eS :58.50 ( 0.87 ) CERI WSSR 175.9 76 eP :37.76 (-0.08 ) eS :59.14 ( 0.75X) CERI RBNC 230.4 77 eP+ :45.44 (-0.49 ) eS 18:00:12.80 ( 0.42 ) CERI RICH 264.0 64 eP+ :49.20 (-0.72 ) CERI BRBC 302.3 72 eP :56.74 ( 2.00X) Additional Data: GIT CDG P 17:59:22.9 S 17:59:32.6 GIT DALG P :17.4 S :21.8 GIT ATL P :41.1 S 18:00:03.0 ***** 1991 AUGUST 18; 15:32 - WHITEOAK FLATS, TENNESSEE ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 910818 153216.8 35.473 84.072 14.9 7 25 192 0.1 C B/D 0.7 -21 0.2 2.5 B 0.4 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI GBTN 24.8 329 iPc 15:32:21.82 ( 0.04 ) eS 15:32:25.28 (-0.11 ) CERI TKL 33.9 53 eP- :23.14 ( 0.00 ) eS :27.80 ( 0.06 ) CERI ETT 38.5 245 iPd :23.96 ( 0.11 ) eS :28.96 (-0.01 ) CERI WSSR 49.8 116 eP :26.06 ( 0.40X) eS :31.88 (-0.22 ) CERI GMG 87.0 219 eS :42.28 ( 0.37X) ***** 1991 AUGUST 18; 19:41 - DUCKTOWN, TENNESSEE ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 910818 194135.0 35.011 84.376 6.3 5 32 250 0.2 D C/D 2.0 -80 1.3 99.0 D 0.1 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI GMG 31.5 239 eP+ 19:41:40.82 ( 0.17 ) eS 19:41:44.34 (-0.43 ) CERI ETT 35.6 348 iPd :41.42 ( 0.13 ) eS :45.74 (-0.14 ) CERI BBG 53.8 106 eS :51.06 (-0.13 ) CERI GBTN 74.2 12 eP :47.68 ( 0.02X) eS :56.40 (-0.49X) CERI WSSR 78.5 68 eS :57.68 (-0.57X) ***** 1991 AUGUST 24; 03:23 - MIDDLETON PLACE, SOUTH CAROLINA ***** CSU Felt (II) between Middleton Place and Summerville. Magnitude 2.1. USGS NOTE: Fault Plane Solution (strike, dip, rake) Nodal Plane: 40.0 30.0 100.0 Nodal Plane: 208.5 60.5 84.3 P Axis: -57.3 74.7 T Axis: 103.8 16.1 SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I USC 910824 032337.8 32.944 80.151 6.4 8 5 106 0.0 0.6 360 0.6 1.4 1.5 USGS 910824 032338.2 32.939 80.167 2.2 33 5 0.2 0.7 90 0.7 1.7 1.6 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC MGS 5.2 169 iPc 03:23:39.50 (-0.02 ) USC RGR 5.7 225 iPc :39.54 ( 0.01 ) USC BCS 9.0 63 iPd :40.18 ( 0.02 ) USC SVS 9.4 287 iPd :40.12 ( 0.01 ) USC WAS 15.6 227 iPd :41.11 ( 0.09 ) USC HBF 16.9 272 iPd :41.20 (-0.01 ) USC TWB 19.5 13 iPd :41.77 ( 0.00 ) USC SGS 43.4 310 ePd :45.74 (-0.02 ) USC COW 70.6 314 eP+ :50.05 ( 0.04X) USC VRN 74.3 278 eP- :50.70 ( 0.10X) USC MTT 165.3 303 eP+ :24:04.80 ( 0.73X) USC LHS 181.0 341 eP+ :07.75 ( 1.93X) USC JSC 181.2 326 eP+ :06.85 ( 1.01X) USGS RGR 4.5 213 iPc 03:23:39.55 ( 0.21 ) S 03:23:40.20 ( 0.01 ) USGS MGS 5.3 152 iPc :39.55 ( 0.03 ) S :40.10 (-0.20 ) USGS SVS 8.3 293 iPd :40.20 ( 0.12 ) S :41.40 (-0.05 ) USGS BCS 10.9 64 iPd :40.20 (-0.21 ) S :41.99 (-0.01 ) USGS WAS 14.1 224 eP- :41.13 ( 0.16 ) S :43.66 ( 0.27 ) USGS HBF 19.7 268 iPd :41.22 (-0.33 ) S :43.20 (-0.27 ) USGS TWB 20.4 17 iPd :41.83 (-0.18 ) S :44.20 (-0.24 ) USGS HWD 24.7 206 eP- :45.80 ( 2.58 ) S :50.20 ( 1.48 ) USGS DRC 27.9 312 iPc :43.51 ( 0.06 ) USGS CFS 37.7 359 eP- :45.85 ( 0.77 ) S :49.35 (-0.09 ) USGS SGS 42.8 311 iPc :45.75 (-0.20 ) S :53.20 ( 0.87 ) USGS COW 70.1 314 eP- :50.05 (-0.34 ) S :24:03.52 ( 1.66 ) USGS VRN 73.2 278 eP- :50.80 (-0.11 ) S :01.40 ( 0.63 ) USGS MTT 163.4 303 eP+ :24:04.90 (-0.07 ) S :25.10 ( 0.27 ) USGS JSC 179.6 325 eP- :07.00 ( 0.21 ) S :28.80 ( 0.46 ) USGS LHS 180.8 340 eP- :06.86 ( 0.03 ) S :27.70 ( 0.07 ) USGS PRM 239.4 302 eP+ :15.75 ( 1.21 ) S :44.60 ( 1.37 ) ***** 1991 SEPTEMBER 8; 22:14 - GRAVESTON, TENNESSEE ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 910908 221419.9 36.154 83.793 5.9 11 51 253 0.2 D C/D 1.5 -77 0.4 3.0 C 1.8 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI CCVA 51.1 13 eS 22:14:35.18 (-0.03 ) CERI TKL 55.0 178 eP 22:14:29.94 ( 0.54 ) eS :36.08 (-0.24 ) CERI GBTN 66.0 215 iPc :31.30 ( 0.08 ) eS :39.34 (-0.12 ) CERI WSSR 99.1 169 ePd :37.20 ( 0.43 ) eS :48.92 (-0.15X) CERI BHT 109.3 252 eS :52.44 ( 0.62X) CERI ETT 109.7 213 eP :38.18 (-0.21 ) eS :51.86 (-0.01 ) CERI BBG 142.0 181 eP :43.86 ( 0.45 ) eS :15:00.82 ( 0.26 ) CERI BRBC 143.5 108 eP :43.26 (-0.44 ) eS :01.70 ( 0.65X) CERI GMG 163.9 209 eP :47.24 ( 0.50X) eS :05.88 (-0.44X) CERI GFM 178.8 91 eS :09.50 (-0.86X) ***** 1991 SEPTEMBER 14; 07:36 - GOOCHLAND, VIRGINIA ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I VTSO 910914 073617.2 37.766 78.138 10.5 16 4 113 0.4 C C/B 1.2 -51 0.8 1.7 B 2.3 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) VTSO GHV 4.1 40 iPc 07:36:19.13 ( 0.04 ) eS? 07:36:20.72 ( 0.26 ) VTSO NA12 33.1 43 iPd :23.15 ( 0.22 ) iS :26.90 (-0.20 ) VTSO CVL 37.2 310 iPd :23.74 ( 0.17 ) iS :28.06 (-0.15 ) VTSO NA5 44.6 52 iPd :24.81 ( 0.07 ) iS :29.76 (-0.47 ) VTSO NA2 52.8 40 eP :26.29 ( 0.23 ) eS :31.49 (-1.03 ) VTSO FRV 65.4 198 ePd :27.87 (-0.24 ) eS :35.77 (-0.29 ) VTSO CNV 83.0 54 eP :31.61 ( 0.65 ) iS :41.46 ( 0.48 ) VTSO PBV 102.2 148 eP :34.07 ( 0.01 ) eS :46.35 ( 0.07 ) ***** 1991 SEPTEMBER 22; 19:57 - COKESBURY, SOUTH CAROLINA ***** CERI For informational purposes only. USC This earthquake appears to be away from any known operating quarry and is away from the Greenwood Reservoir. SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 910922 195722.3 34.258 82.120 12.8 14 151 271 0.3 D C/D 3.9 -30 0.9 8.9 D 2.3 USC 910922 195722.4 34.245 82.134 1.0 4 28 208 0.3 C B/D 2.3 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI BENN 151.0 16 eP 19:57:46.70 ( 0.02 ) eS 19:58:05.46 ( 0.98X) CERI BRBC 165.0 355 eP :49.10 ( 0.17 ) eS :07.98 (-0.39 ) CERI BBG 169.6 294 iP :49.30 (-0.27 ) eS :09.56 ( 0.08 ) CERI WSSR 175.0 311 iP :50.48 ( 0.08 ) eS :11.56 ( 0.64X) CERI GFM 207.6 8 iP :55.76 ( 0.34 ) eS :21.48 ( 1.87X) CERI TKL 216.7 316 iP :57.36 ( 0.66 ) eS :22.60 ( 0.78 ) CERI GMG 243.5 287 iP :58:00.32 (-0.46 ) eS :30.10 ( 1.22 ) CERI ETT 244.3 300 iP :01.12 ( 0.30 ) eS :29.46 ( 0.51 ) CERI GBTN 246.7 310 iP :01.36 ( 0.28 ) eS :30.98 ( 1.58X) USC PRM 27.6 230 iPu 19:57:27.93 (-0.03 ) S 19:57:31.40 ( 0.11X) USC MTT 71.4 140 eP :35.78 ( 0.75 ) S :44.35 ( 0.83X) USC JSC 80.5 87 eP :36.16 (-0.33 ) S :46.13 ( 0.07X) USC LHS 124.6 78 eP :43.92 ( 0.32 ) S :58:00.00 ( 1.64X) ***** 1991 SEPTEMBER 22; 21:22 - COKESBURY, SOUTH CAROLINA ***** CERI For informational purposes only. USC This earthquake appears to be away from any known operating quarry and is away from the Greenwood Reservoir. SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 910922 212254.8 34.356 82.216 15.5 7 143 271 0.3 D D/D 5.1 -16 1.3 99.0 D 2.4 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI BENN 143.4 21 eP 21:23:17.38 (-0.51 ) eS 21:23:36.98 ( 2.23X) CERI BRBC 153.6 358 eP :19.82 ( 0.28 ) eS :42.12 ( 4.50X) CERI BBG 157.2 292 iP :20.12 ( 0.08 ) eS :38.28 (-0.20 ) CERI GFM 198.2 11 eP :26.40 ( 0.04 ) eS :51.62 ( 2.21X) CERI TKL 202.7 316 eP :27.38 ( 0.44 ) eS :54.78 ( 4.37X) CERI GBTN 233.0 309 eP :32.14 ( 0.58 ) eS :24:00.62 ( 2.21X) ***** 1991 SEPTEMBER 22; 23:42 - NINETY SIX, SOUTH CAROLINA ***** CERI For informational purposes only. USC This earthquake appears to be away from any known operating quarry and is away from the Greenwood Reservoir. SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 910922 234243.4 34.192 82.107 2.8 11 152 274 0.6 D D/D 18.3 -21 3.0 23.1 D 1.1 USC 910922 234243.7 34.432 82.266 2.0 5 40 255 0.6 D D/D 39.2 360 39.2 34.8 2.4 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI TRYN 119.9 354 eS 23:43:15.36 (-3.23X) CERI RBNC 152.2 328 eP 23:43:08.08 (-0.69 ) eS :26.68 (-0.60X) CERI BENN 157.7 15 eP :09.42 (-0.10 ) eS :29.40 ( 0.82X) CERI BRBC 172.4 355 eP :15.32 ( 3.45 ) eS :34.58 ( 1.93X) CERI BBG 173.7 296 eP :12.08 ( 0.06 ) eS :33.02 ( 0.11 ) CERI WSSR 180.7 312 eP :13.18 ( 0.09 ) eS :33.94 (-0.82X) CERI GFM 214.6 7 eP :18.52 ( 0.20 ) eS :44.32 ( 0.51X) CERI TKL 222.8 317 eP :20.06 ( 0.61 ) eS :46.08 ( 0.31X) CERI PKNC 223.2 23 eP :19.82 ( 0.28 ) eS :45.46 (-0.46X) CERI ETT 249.0 301 eP :24.22 ( 0.73X) eS :52.16 (-0.59 ) CERI GBTN 252.3 311 eP :24.04 ( 0.07 ) eS :53.60 ( 0.02X) USC PRM 39.6 193 iPu 23:42:50.10 (-0.09 ) S 23:42:54.89 (-0.04X) USC JSC 94.0 100 iP- :58.32 (-0.63 ) S :43:10.89 ( 0.79X) USC MTT 95.3 142 iPd :43:00.85 ( 1.70 ) USC LHS 134.0 88 iPu :06.00 ( 0.60 ) S :21.50 ( 0.25X) USC VRN 197.7 142 iPu :15.45 ( 0.98 ) ***** 1991 SEPTEMBER 24; 07:21 - BINFIELD, TENNESSEE ***** NEIC Felt (IV) at Louisville, Maryville and Tallassee. Felt (III) at Alcoa, Tennessee. Standard deviation 1.0 on 15 of 17 observations. SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I NEIC 910924 072106.5 35.711 84.095 5.0F 15 11 4.6 0 3.6 3.0 3.3 4 CERI 910924 072107.0 35.691 84.120 14.2 18 9 124 0.1 B A/B 0.6 -6 0.3 0.5 A 3.3 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) NEIC GBTN 11.1 244 iPc 07:21:09.98 ( 1.2 ) NEIC ORT 28.9 319 P :12.40 ( 0.6 ) NEIC TKL 30.0 101 iP :12.89 ( 1.0 ) NEIC ETT 53.4 217 P :15.80 (-0.4 ) NEIC CRTN 58.9 23 P :17.00 (-0.1 ) NEIC WSSR 66.7 136 P :18.70 ( 0.1 ) NEIC BHT 77.8 281 P :19.20 (-1.4 ) NEIC WMTN 94.5 237 P :22.30 (-1.1 ) NEIC BBG 96.7 164 P :22.90 (-0.8 ) NEIC ANTN 114.5 297 P :25.40 (-1.0 ) NEIC BRTN 131.2 57 P :28.50 (-0.6 ) NEIC TCT 313.6 277 P :54.50 ( 1.4 ) NEIC NAV 344.7 58 eP :56.68 (-0.4 ) NEIC BLA 369.2 62 eP :22:00.11 ( 0.0 ) eS 07:22:50.99 ( X) NEIC PWLA 370.3 258 eP :01.50 ( 1.3 ) NEIC ELC 491.5 292 eP :19.83 ( 4.1X ) NEIC CVL 561.6 62 ePn :31.16 ( 6.4X ) eSg :23:40.13 ( X) CERI GBTN 8.7 251 iPd 07:21:10.00 ( 0.09 ) eS 07:21:12.10 ( 0.08X) CERI TKL 31.6 96 iPc :12.86 (-0.06 ) eS :17.02 (-0.21 ) CERI ETT 50.6 217 iPd :15.82 (-0.11 ) eS :22.30 (-0.13 ) CERI WSSR 67.2 133 iPc :18.68 ( 0.14 ) CERI BHT 76.6 283 iPc :19.90 (-0.02 ) eS :29.52 ( 0.18X) CERI BBG 94.9 163 iPc :22.94 ( 0.16 ) eS :34.10 (-0.18 ) CERI GMG 104.7 209 eP- :24.24 (-0.01 ) eS :37.30 ( 0.48X) CERI CCVA 109.1 22 eP :24.48 (-0.39X) eS :38.60 ( 0.70X) CERI RBNC 109.3 109 iPc :25.26 ( 0.23 ) eS :37.98 (-0.20X) CERI SMTN 114.1 48 eP- :25.34 (-0.33 ) eS :44.34 ( 5.06X) CERI RICH 120.3 77 eP :26.70 ( 0.07 ) CERI RCG 137.0 235 eP+ :29.38 ( 0.23 ) eS :49.64 ( 4.34X) CERI BRBC 166.0 88 iPd :33.96 ( 0.23 ) eS :53.40 ( 0.18X) CERI TRYN 176.5 105 iPc :35.80 ( 0.57 ) eS :57.12 ( 1.30X) CERI GFM 213.9 77 eP :40.98 (-0.06 ) eS :22:06.48 ( 0.60X) CERI BENN 223.2 93 eP+ :42.26 (-0.12 ) eS :09.74 ( 1.55X) CERI PKNC 270.4 81 eP :47.56 (-1.05X) eS :21.78 ( 2.81X) CERI PLVA 287.4 67 iPc :49.56 (-1.19X) CERI PWLA 367.1 259 eP :22:00.40 ( 0.05X) eS :48.20 ( 8.91X) Additional Data: GIT DALG P 07:21:27.9 S 07:21:43.1 GIT CDG P :27.9 S :43.1 GIT ATL P :47.2 S :22:16.2 ***** 1991 SEPTEMBER 28; 11:27 - RANDALLSTOWN, MARYLAND ***** NEIC Chesapeake Bay region; felt at Randallstown, Maryland. Standard deviation 0.6, five stations used (location from Preliminary Determination of Epicenters, No. 39-91, Oct. 18, 1991). SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I VTSO 910928 112737.7 39.249 76.722 5.0F 9 101 190 0.3 D D/D 11.7 -46 2.2 7.9 D 1.9 NEIC 910928 112734.8 39.564 76.979 5.0F 2.4 F SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) VTSO NED 101.1 60 iP 11:27:54.00 (-0.30 ) iS 11:28:06.80 ( 0.36 ) VTSO BWD 115.9 58 iP :56.30 (-0.43 ) iS :11.00 ( 0.37 ) VTSO NA5 163.4 213 P :28:04.00 (-0.25 ) eS :23.50 ( 0.00 ) VTSO CVL 206.7 228 iP+ :09.90 ( 0.27 ) S :33.30 ( 0.46 ) ***** 1991 OCTOBER 7; 12:04 - LITTLE SWITZERLAND, NORTH CAROLINA ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 911007 120406.3 35.856 82.026 32.8 7 35 202 0.2 D D/D 13.2 -38 1.8 6.4 D 2.6 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI GFM 34.5 35 iP 12:04:14.00 (-0.14 ) eS 12:04:20.00 ( 0.12 ) CERI RBNC 103.1 238 iP :24.00 ( 0.37 ) eS :36.00 (-0.31 ) CERI TKL 159.6 263 iP :32.00 ( 0.00 ) eS :51.00 ( 0.21X) CERI BBG 195.4 237 iP :37.00 (-0.03 ) eS :59.40 (-0.09 ) ***** 1991 OCTOBER 9; 04:27 - COHUTTA, GEORGIA ***** CERI/TVA This event is an earthquake. GIT This event is probably a blast. SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 911009 042751.1 34.928 84.922 9.7 9 24 291 0.1 C A/D 0.4 1 0.2 0.9 A 2.1 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI GMG 24.1 108 iPd 04:27:55.66 (-0.01 ) CERI RCG 39.3 278 eP :58.36 ( 0.30X) eS 04:28:03.10 (-0.03 ) CERI ETT 61.3 44 iPd :28:01.72 ( 0.04 ) eS :09.30 (-0.09 ) CERI BBG 101.7 93 eP :08.06 (-0.13 ) eS :19.90 (-0.76X) CERI GBTN 104.3 38 eP :08.64 ( 0.14 ) eS :21.12 (-0.07 ) CERI WSSR 128.5 72 iPd :12.36 ( 0.06 ) CERI TKL 132.2 52 eP :13.20 ( 0.43 ) eS :28.82 ( 0.25X) Additional Data: GIT DALG P 04:27:54.9 S 04:27:58.0 ***** 1991 OCTOBER 14; 11:10 - VONORE, TENNESSEE ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 911014 111037.6 35.578 84.187 8.2 9 10 126 0.1 B B/B 0.9 -25 0.3 2.3 B 1.9 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI GBTN 10.0 347 iPc 11:10:40.04 ( 0.14 ) eS 11:10:41.46 (-0.11 ) CERI ETT 37.1 221 eP :44.06 (-0.12 ) eS :49.00 ( 0.04 ) CERI TKL 38.5 76 iPd :44.24 (-0.15 ) eS :49.40 ( 0.07 ) CERI WSSR 64.5 121 iPc :48.92 ( 0.16 ) eS :56.82 (-0.07 ) CERI GMG 90.7 209 eP :53.28 ( 0.19 ) eS :11:03.48 (-0.91X) ***** 1991 OCTOBER 19; 15:30 - CATLETT, GEORGIA ***** CERI/TVA This event is an earthquake. GIT This event is probably a blast. SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 911019 153021.1 34.741 85.189 11.8 18 30 194 0.2 C B/D 1.0 26 0.3 0.8 A 2.6 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI RCG 29.8 331 iPc 15:30:26.72 ( 0.09 ) iS 15:30:30.56 (-0.09 ) CERI GMG 49.3 74 ePc :29.86 ( 0.06 ) eS :36.14 ( 0.00 ) CERI ETT 93.3 46 iPd :36.50 (-0.22 ) eS :47.92 (-0.18 ) CERI BHT 124.7 10 eP+ :41.70 ( 0.15 ) eS :56.66 ( 0.19 ) CERI BBG 126.9 83 eP :42.08 ( 0.14 ) eS :56.58 (-0.55 ) CERI GBTN 135.9 41 ePd :43.02 (-0.20 ) eS :59.78 ( 0.43 ) CERI WSSR 158.7 67 iPc :46.94 ( 0.14 ) eS :31:05.62 ( 0.08 ) CERI TKL 164.3 51 eP+ :47.38 (-0.18 ) eS :07.00 ( 0.14 ) CERI RICH 252.1 58 eP :31:01.34 ( 0.58 ) CERI SMTN 257.4 44 eP :02.34 ( 0.95X) CERI PWLA 264.2 277 eP :02.10 (-0.05 ) CERI BRBC 286.5 66 eP :06.18 ( 1.08X) Additional Data: GIT DALG P 15:30:25.0 ***** 1991 OCTOBER 21; 01:10 - CATLETT, GEORGIA ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 911021 011048.6 34.732 85.157 14.6 11 47 322 0.2 D C/D 4.4 46 0.8 9.7 D 2.0 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI GMG 46.8 72 eP 01:10:57.10 ( 0.12 ) eS 01:11:03.10 ( 0.02 ) CERI ETT 91.9 44 iP :11:03.60 (-0.24 ) eS :14.70 (-0.24 ) CERI BBG 124.2 82 eP+ :09.10 ( 0.25 ) eS :23.70 ( 0.10X) CERI BHT 125.2 9 eS :24.10 ( 0.30 ) CERI GBTN 134.8 39 eS :26.50 ( 0.24 ) CERI WSSR 156.3 67 eP- :14.20 ( 0.42 ) eS :32.40 ( 0.27 ) CERI TKL 162.6 50 eP :15.80 ( 1.16 ) eS :34.40 ( 0.77 ) Additional Data: GIT DALG P 01:10:53.0 S 01:10:54.6 GIT CDG P :58.1 S :11:03.8 ***** 1991 OCTOBER 22; 06:30 - LYERLY, GEORGIA ***** CERI For informational purposes only. SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 911022 063057.3 34.495 85.418 8.2 12 54 293 0.2 D C/D 1.7 25 1.0 2.5 B 1.8 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI RCG 53.7 7 iP 06:31:06.70 ( 0.18 ) eS 06:31:13.18 (-0.11 ) CERI GMG 79.8 59 eP :09.76 (-1.12 ) eS :20.88 ( 0.05 ) CERI ETT 127.5 43 iPc :17.86 (-0.44 ) eS :34.04 ( 0.36 ) CERI BBG 153.2 74 iPc :22.20 (-0.11 ) eS :40.18 (-0.42 ) CERI GBTN 170.3 40 eP :23.86 (-0.98 ) eS :45.02 ( 0.03 ) CERI WSSR 189.3 62 eP :27.84 (-0.01 ) eS :50.24 ( 0.06 ) Additional Data: GIT DALG P 06:31:06.1 S 06:31:13.0 GIT CDG P :09.5 S :18.7 ***** 1991 OCTOBER 25; 10:44 - BOYDS CREEK, TENNESSEE ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 911025 104450.1 35.902 83.690 20.8 9 28 290 0.1 D C/D 1.6 18 0.7 2.1 B 1.6 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI TKL 28.0 196 iP 10:44:56.00 ( 0.08 ) eS 10:45:00.00 (-0.14 ) CERI GBTN 53.9 241 iP :59.50 (-0.10 ) eS :06.50 (-0.02 ) CERI WSSR 69.9 172 iP :45:02.00 (-0.11 ) eS :11.00 ( 0.14 ) CERI ETT 94.3 228 eP :06.10 ( 0.37 ) eS :17.50 ( 0.39X) CERI BHT 113.5 267 eS :23.00 ( 0.74 ) CERI GFM 171.3 82 eS :37.50 (-0.18 ) ***** 1991 OCTOBER 27; 01:41 - DUCKTOWN, TENNESSEE ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 911027 014105.5 35.007 84.381 12.1 7 31 243 0.2 C B/D 1.1 46 0.7 2.4 B 0.6 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI GMG 30.9 239 eS 01:41:15.32 (-0.16 ) CERI ETT 36.0 349 iPd 01:41:12.20 ( 0.16 ) eS :16.62 (-0.17 ) CERI BBG 54.1 106 eP :15.10 ( 0.09 ) eS :21.82 (-0.11 ) CERI GBTN 74.7 12 eP :18.28 ( 0.05 ) eS :27.18 (-0.33 ) CERI BRBC 206.9 66 eS :42:05.38 ( 2.59X) ***** 1991 OCTOBER 28; 10:46 - TRANQUILLITY, TENNESSEE ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 911028 104620.7 35.611 84.721 13.1 12 33 180 0.1 B A/C 0.3 33 0.2 0.5 A 1.6 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI BHT 33.2 322 iPc 10:46:26.82 ( 0.00 ) eS 10:46:31.24 (-0.05 ) CERI ETT 39.7 143 eP+ :27.94 ( 0.11 ) eS :32.92 (-0.13 ) CERI GBTN 46.6 82 iPd :28.96 ( 0.05 ) iS :34.88 (-0.03 ) CERI GMG 83.1 177 eP :34.80 ( 0.11X) CERI TKL 85.9 86 eP :35.02 (-0.03 ) iS :45.48 (-0.06 ) CERI RCG 90.7 219 eS :46.70 (-0.13 ) CERI WSSR 110.1 109 eS :52.12 ( 0.01 ) CERI BBG 116.3 134 eP :40.06 ( 0.26 ) eS :53.60 (-0.15 ) ***** 1991 OCTOBER 30; 14:54 - TENNGA, GEORGIA ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 911030 145412.4 34.893 84.711 10.8 26 5 147 0.3 C B/C 0.6 11 0.5 0.7 A 3.2 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI GMG 5.0 132 iPc 14:54:14.81 ( 0.13 ) eS 14:54:16.01 (-0.30 ) CERI ETT 53.4 26 eP- :21.73 ( 0.00 ) iS :28.47 (-0.04 ) CERI RCG 58.9 279 eP- :22.69 ( 0.06 ) eS :29.87 (-0.19 ) CERI BBG 82.3 91 iPd :26.51 ( 0.02 ) eS :36.15 (-0.58 ) CERI GBTN 97.1 28 eP- :28.47 (-0.18 ) eS :39.95 (-0.53 ) CERI BHT 107.9 349 eP+ :30.47 ( 0.11 ) eS :44.01 ( 0.57 ) CERI WSSR 111.8 67 eP- :31.15 ( 0.15 ) eS :44.87 ( 0.32 ) CERI TKL 120.3 45 eP+ :32.31 ( 0.09 ) eS :46.69 ( 0.04 ) CERI RBNC 165.4 71 eP- :39.45 ( 0.19 ) eS :59.49 ( 0.66 ) CERI RICH 206.1 56 eP+ :45.85 ( 0.44 ) CERI CCVA 211.9 26 eS :55:11.95 ( 1.02 ) CERI SMTN 215.6 40 eP+ :47.13 ( 0.29 ) eS :12.97 ( 1.03X) CERI TRYN 228.6 79 eP :49.61 ( 0.76 ) eS :16.25 ( 0.82 ) CERI BRBC 239.7 66 eP+ :50.75 ( 0.11 ) eS :19.33 ( 0.81 ) CERI BENN 287.5 74 eP :56.81 ( 0.30 ) CERI GFM 296.1 62 eP+ :57.47 (-0.20X) CERI PKNC 346.9 67 eP :55:03.99 ( 0.22X) CERI PLVA 376.5 57 eP :06.81 (-0.64X) Additional Data: GIT DALG P 14:54:18.4 GIT CDG P :18.5 S 14:54:21.4 GIT ATL P :40.8 S :59.5 ***** 1991 NOVEMBER 3; 06:53 - RAFTER, TENNESSEE ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 911103 065352.7 35.437 84.207 0.6 7 26 118 0.1 C C/C 0.8 -55 0.3 3.9 C 1.2 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI GBTN 25.5 359 iP 06:53:57.34 ( 0.10 ) iS 06:54:00.48 (-0.06 ) CERI ETT 25.7 242 iPd :57.26 (-0.01 ) eS :00.56 (-0.04 ) CERI TKL 46.4 58 eP :54:01.88 ( 0.94 ) eS :06.88 (-0.08 ) CERI BBG 72.1 150 eP :05.40 (-0.01 ) ***** 1991 NOVEMBER 3; 07:05 - RAFTER, TENNESSEE ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 911103 070559.9 35.445 84.227 6.6 6 25 178 0.1 C C/C 1.3 -52 0.3 17.2 D 1.0 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI ETT 24.5 238 iPd 07:06:04.40 ( 0.01 ) eS 07:06:07.64 (-0.01 ) CERI GBTN 24.6 3 iPc :04.44 ( 0.05 ) iS :07.62 (-0.04 ) CERI TKL 47.5 60 eP :08.06 (-0.10 ) eS :14.24 ( 0.06 ) CERI WSSR 61.8 107 eS :18.26 (-0.14X) ***** 1991 NOVEMBER 10; 09:54 - DUGOUT VALLEY, ALABAMA ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 911110 095436.8 34.557 85.673 3.9 7 55 315 0.0 C B/D 1.2 72 0.5 2.4 B 1.8 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI RCG 55.1 33 iPc 09:54:46.40 ( 0.00 ) iS 09:54:53.42 ( 0.00 ) CERI GMG 97.9 69 eP :53.50 (-0.01 ) eS :55:02.04 (-3.69X) CERI ETT 140.2 52 iPc :55:00.06 (-0.03 ) eS :15.30 (-1.81X) CERI BHT 157.7 25 eS :21.14 (-0.65X) CERI BBG 174.1 78 eP :05.54 ( 0.18 ) CERI GBTN 181.4 47 eP :06.30 (-0.08 ) eS :24.22 (-3.76X) CERI WSSR 207.4 67 iPc :10.54 ( 0.08 ) eS :31.88 (-3.17X) CERI TKL 211.9 54 eS :32.36 (-3.71X) ***** 1991 NOVEMBER 11; 23:06 - SWEETWATER, TENNESSEE ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 911111 230604.7 35.563 84.466 8.6 7 26 128 0.2 C C/C 1.0 -43 0.9 5.2 C 1.3 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI GBTN 25.8 64 eP 23:06:09.64 ( 0.27 ) eS 23:06:12.94 ( 0.14X) CERI ETT 26.4 178 eP :09.54 ( 0.06 ) iS :12.92 (-0.07 ) CERI BHT 53.5 306 eP :13.84 (-0.11 ) eS :20.34 (-0.39X) CERI TKL 63.6 80 eS :23.28 (-0.27 ) CERI WSSR 86.7 111 eP :19.50 ( 0.04 ) CERI BBG 97.0 142 eP :21.26 ( 0.17 ) eS :32.70 (-0.39X) ***** 1991 NOVEMBER 15; 08:52 - BIG JUNCTION, TENNESSEE ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 911115 085213.2 35.341 84.104 5.9 9 32 78 0.1 C C/C 0.6 -34 0.4 57.9 D 1.7 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI ETT 32.0 267 eP- 08:52:18.92 ( 0.04 ) eS 08:52:22.96 (-0.07 ) CERI GBTN 37.4 345 iPc :19.84 ( 0.08 ) iS :22.92 (-1.63X) CERI TKL 46.3 40 iPc :21.08 (-0.15 ) eS :27.04 (-0.05 ) CERI WSSR 48.3 98 iPc :21.80 ( 0.16 ) eS :27.46 (-0.33X) CERI BBG 58.2 153 iPc :23.28 ( 0.00 ) eS :30.20 (-0.45 ) CERI GMG 74.0 224 eP :25.62 (-0.26 ) eS :35.18 ( 0.05X) ***** 1991 NOVEMBER 17; 06:32 - MIDDLETON PLACE, SOUTH CAROLINA ***** CSU Felt (II). Magnitude 1.02. SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I USC 911117 063211.8 32.988 80.123 3.8 4 5 150 0.0 1.6 360 1.6 5.7 1.3 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC BCS 5.4 100 iPd 06:32:13.37 ( 0.00 ) USC MGS 10.2 190 iPd :14.00 (-0.01 ) USC RGR 11.2 217 iPd :14.12 ( 0.00 ) USC TWB 14.2 7 iPd :14.72 (-0.01 ) ***** 1991 NOVEMBER 21; 05:12 - MT. VERNON, TENNESSEE ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 911121 051202.0 35.468 84.343 9.1 13 19 81 0.2 C B/C 0.5 -49 0.4 1.5 B 2.2 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI ETT 18.8 213 iPd 05:12:05.78 ( 0.14 ) eS 05:12:08.02 (-0.28 ) CERI GBTN 25.0 29 iPd :06.72 ( 0.12 ) eS :09.96 ( 0.00 ) CERI TKL 55.7 68 eP :11.68 ( 0.06 ) eS :18.32 (-0.33 ) CERI BHT 68.9 308 iPc :13.66 (-0.16 ) eS :21.94 (-0.51X) CERI WSSR 72.6 107 iPc :14.54 ( 0.06 ) eS :22.48 (-1.10X) CERI GMG 73.5 204 eP :14.08 (-0.52 ) eS :22.94 (-0.87X) CERI BBG 81.8 144 iPd :15.94 (-0.05 ) CERI RCG 106.6 239 eP :19.84 ( 0.04 ) CERI RBNC 123.8 95 eS :37.70 ( 0.15 ) CERI SMTN 145.8 46 eP :26.30 ( 0.49X) eS :46.72 ( 3.52X) CERI BRBC 188.8 80 eP :33.32 ( 0.81X) eS :56.04 ( 1.27X) CERI TRYN 191.9 96 eS :56.00 ( 0.57 ) CERI GFM 240.1 72 eP :41.06 ( 0.72X) eS :13:08.68 ( 0.35X) CERI BENN 243.5 87 eS :10.42 ( 1.32X) Additional Data: GIT CDG P 05:12:18.8 S 05:12:30.9 GIT DALG P :19.0 S :30.5 ***** 1991 NOVEMBER 22; 05:33 - MT. VERNON, TENNESSEE ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 911122 053341.6 35.476 84.286 10.2 6 22 82 0.1 C C/C 1.4 -51 0.8 3.6 C 2.1 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI GBTN 22.1 18 eP 05:33:45.80 ( 0.01 ) CERI ETT 22.7 223 eP :45.90 (-0.01 ) CERI TKL 50.7 66 eP :50.50 ( 0.09 ) CERI WSSR 68.0 109 eP :53.00 (-0.33 ) CERI BHT 72.5 305 eP :54.00 (-0.02 ) CERI BBG 79.6 147 eP :55.45 ( 0.19 ) ***** 1991 DECEMBER 1; 22:39 - COHUTTA, GEORGIA ***** CERI/TVA This event is an earthquake. GIT This event is probably a blast. SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 911201 223906.4 34.953 84.963 18.8 14 29 164 0.1 C C/C 1.0 15 0.4 3.1 C 2.8 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI GMG 28.5 110 iPc 22:39:12.34 ( 0.10 ) CERI RCG 35.3 274 iPd :13.12 ( 0.01 ) eS 22:39:17.76 (-0.21 ) CERI ETT 62.1 48 iPd :17.10 (-0.02 ) eS :25.16 ( 0.26X) CERI BHT 99.2 1 iP :23.00 ( 0.19 ) CERI GBTN 104.6 41 iP :23.42 (-0.17 ) eS :36.04 (-0.06 ) CERI BBG 105.6 94 eP :23.94 ( 0.10 ) iS :36.16 (-0.37 ) CERI WSSR 131.3 74 eP :27.84 ( 0.07 ) eS :43.76 ( 0.43X) CERI TKL 133.5 54 eP :27.84 (-0.17 ) eS :44.40 ( 0.65 ) CERI RBNC 185.6 75 eP :36.30 ( 0.18 ) eS :58.86 ( 1.08X) CERI RICH 222.3 61 eP :42.48 ( 0.83 ) eS :40:09.14 ( 1.80X) CERI TRYN 250.1 81 iPc :46.12 ( 0.98X) eS :15.66 ( 2.27X) CERI BRBC 258.5 70 iP :47.20 ( 0.90X) eS :18.98 ( 3.59X) CERI BENN 308.0 76 eS :31.56 ( 5.93X) Additional Data: GIT DALG P 22:39:11.2 ***** 1991 DECEMBER 3; 15:15 - TALLASSEE, TENNESSEE ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 911203 151520.8 35.580 84.111 8.3 8 13 117 0.1 C C/B 0.9 -17 0.4 2.8 C 1.2 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI GBTN 13.2 317 iPc 15:15:23.56 ( 0.04 ) iS 15:15:25.48 (-0.04 ) CERI TKL 31.8 74 eP :26.42 (-0.05 ) eS :30.58 (-0.03 ) CERI ETT 42.1 228 iPd :28.16 (-0.01 ) CERI WSSR 58.9 125 eP :31.22 ( 0.23 ) eS :37.90 (-0.53 ) CERI BBG 82.9 161 eS :45.24 (-0.08 ) CERI GMG 94.5 213 eS :48.36 (-0.18X) ***** 1991 DECEMBER 5; 16:10 - TALLASSEE, TENNESSEE ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 911205 161031.1 35.569 84.111 6.5 9 14 112 0.1 C C/C 1.1 -24 0.4 7.9 D 2.0 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI GBTN 14.1 320 iPc 16:10:33.84 ( 0.03 ) eS 16:10:35.86 ( 0.05X) CERI TKL 32.1 72 eP :36.66 (-0.10 ) eS :40.76 (-0.16 ) CERI ETT 41.2 229 iPc :38.34 ( 0.06 ) iS :43.40 (-0.15 ) CERI WSSR 58.1 124 iPd :41.30 ( 0.18 ) CERI BBG 81.7 160 iPd :45.00 (-0.03 ) eS :55.08 (-0.14 ) CERI GMG 93.4 213 eP :47.08 ( 0.14 ) ***** 1991 DECEMBER 6; 04:39 - WAYNESVILLE, NORTH CAROLINA ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 911206 043932.5 35.489 82.930 11.6 7 16 88 0.1 B B/B 1.0 -41 0.6 1.9 B 1.8 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI RBNC 15.5 199 iPd 04:39:35.98 ( 0.03 ) iS 04:39:38.04 (-0.47X) CERI RICH 48.8 12 eP :41.08 ( 0.06 ) eS :46.62 (-0.66X) CERI WSSR 63.4 249 iP :43.34 (-0.10 ) eS :51.10 (-0.37X) CERI BRBC 64.6 64 eP :43.48 (-0.21 ) eS :51.26 (-0.63X) CERI TRYN 66.8 111 eP :43.98 ( 0.00 ) eS :51.68 (-0.72X) CERI TKL 78.8 284 eP :45.80 (-0.01 ) eS :55.16 (-0.41X) CERI BBG 105.3 230 eP :50.42 ( 0.45 ) eS :40:04.00 ( 1.24X) CERI BENN 115.4 85 eP :54.70 ( 3.23X) CERI ETT 139.7 263 eP :57.04 ( 1.88X) eS :12.16 ( 0.41X) ***** 1991 DECEMBER 14; 02:15 - MEADOW, TENNESSEE ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 911214 021550.6 35.747 84.239 15.2 6 9 260 0.1 D D/D 2.6 -27 0.6 1.7 B 1.8 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI GBTN 9.3 164 iPc 02:15:53.66 ( 0.00 ) eS 02:15:55.86 (-0.05X) CERI TKL 43.2 103 ePd :58.30 ( 0.01 ) iS :16:03.84 (-0.09 ) CERI ETT 50.7 203 ePd :59.40 (-0.05 ) iS :05.94 ( 0.01 ) CERI WSSR 79.4 131 eP+ :16:04.14 ( 0.22 ) ***** 1991 DECEMBER 22; 02:56 - GOODFIELD, TENNESSEE ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 911222 025610.6 35.378 84.795 9.9 6 32 250 0.1 D C/D 1.8 -54 1.1 3.4 C 1.9 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI ETT 31.5 100 eP 02:56:16.48 ( 0.22 ) iS 02:56:20.36 (-0.05 ) CERI GMG 58.3 169 eP+ :20.64 (-0.04 ) CERI GBTN 61.9 59 iPd :21.16 (-0.07 ) CERI BBG 105.7 122 eP- :28.22 (-0.04 ) CERI WSSR 111.2 95 eP :29.30 ( 0.19 ) ***** 1991 DECEMBER 29; 04:22 - PARKSVILLE, TENNESSEE ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 911229 042255.6 35.049 84.692 9.8 4 21 220 0.0 D D/D 82.9 -80 1.7 74.9 D 1.7 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI GMG 20.8 175 iPc 04:22:59.62 ( 0.00 ) CERI ETT 37.5 35 iPc :23:02.26 ( 0.00 ) CERI BBG 82.8 103 ePc :09.76 ( 0.00 ) CERI WSSR 104.6 76 eP :13.12 ( 0.01 ) HYPOCENTRAL PARAMETERS, MAGNITUDES, AND ARRIVAL TIMES FOR RESERVOIR ACTIVITY: JANUARY THROUGH DECEMBER 1991 Events are listed chronologically (this also applies to multiple hypocenter locations for the same event). All times are Universal Time. Most entries in the listing are self-explanatory. Items that might require further explanation are defined in Appendix A. GIT Special note regarding the Lake Sinclair swarm from January 4 through February 7. All listed events of the Lake Sinclair swarm were felt. The two largest were felt with intensity II-III over 1250 sq km. The epicentral zone with an approximate radius of 1.5 km felt these events with intensity IV and V (7 sq km). Cracked plaster and damages to brick walls were reported. Location is based on data from a portable digital recorder located in the Forest Lake subdivision - Latitude = 33.252, Longitude = 83.303, ERH = 0.8 km. No evidence exists to suggest that depths of focus are other than those typical of shallow reservoir induced seismicity. All are very likely less than 2 km deep. No stations existed close enough to these events to constrain the depth except for the portable station from Georgia Tech which suggests depths less than 1 km. In the following list, all GIT locations are based on this information. ***** 1991 JANUARY 8; 06:24 - LAKE SINCLAIR, GEORGIA ***** CERI For informational purposes only. SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I GIT 910108 0624 33.252 83.303 1.0F 3 0.8 F CERI 910108 062408.7 33.220 83.194 14.4 19 192 302 0.3 D C/D 2.3 42 1.6 2.3 B 2.5 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI BBG 192.2 343 eP 06:24:39.68 ( 0.35 ) eS 06:25:01.64 (-0.06 ) CERI GMG 227.6 324 eP :44.66 (-0.07 ) eS :10.80 (-0.25 ) CERI WSSR 231.1 351 eP :44.64 (-0.65 ) eS :11.96 (-0.04 ) CERI RBNC 237.9 5 eP :46.30 (-0.11 ) eS :14.48 ( 0.53 ) CERI TRYN 243.3 21 eP :47.10 ( 0.14 ) eS :14.34 (-0.56 ) CERI ETT 260.9 334 eP- :48.90 (-0.17 ) eS :18.56 ( 0.01 ) CERI TKL 275.8 349 eP- :50.36 (-0.50 ) eS :21.74 ( 0.10 ) CERI RCG 278.3 315 eS :23.20 ( 1.01 ) CERI GBTN 287.1 341 eP :51.92 (-0.31 ) eS :24.54 ( 0.52 ) CERI BRBC 291.7 16 eP :53.70 ( 0.69 ) CERI GFM 345.0 21 eP :25:00.22 ( 0.72 ) Additional Data: GIT ATL P 06:24:24.9 ***** 1991 JANUARY 9; 05:10 - LAKE SINCLAIR, GEORGIA ***** CERI For informational purposes only. SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I GIT 910109 0510 33.252 83.303 1.0F 3 0.8 F TVA 910109 051010.3 33.089 83.225 3.7 14 205 263 0.6 D D/D 30.1 -12 4.0 99.0 D 2.6 CERI 910109 051010.7 33.189 83.222 13.0 20 195 261 0.3 D D/D 2.4 58 1.6 2.3 B 2.6 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) TVA BBG 205.2 345 eP+ 05:10:42.28 (-0.65 ) eS 05:11:04.46 (-1.63 ) TVA GMG 237.8 326 eP :47.06 ( 0.19 ) eS :13.38 ( 0.54 ) TVA WSSR 244.9 352 eP- :47.40 (-0.38 ) eS :14.96 ( 0.56 ) TVA RBNC 252.5 5 eP :49.12 ( 0.35 ) eS :16.74 ( 0.66 ) TVA ETT 272.8 336 ePd :51.50 ( 0.42 ) eS :21.24 ( 1.20 ) TVA RCG 286.7 317 eS :25.72 ( 2.80X) TVA TKL 289.4 350 eP :55.20 ( 2.12X) eS :30.30 ( 6.84X) eP- :52.92 (-0.16X) TVA GBTN 299.9 343 ePd :54.60 ( 0.24X) eS :27.06 ( 1.41X) TVA TQTN 302.6 333 eP :55.20 ( 0.52X) eS :29.50 ( 3.30X) TVA BRBC 306.3 16 eP :56.40 ( 1.03 ) TVA LMTN 310.8 357 iP :55.51 (-0.23X) eS :22.60 ( 1.60X) TVA CRTN 349.7 351 eP :11:00.60 ( 0.13X) TVA PKNC 378.9 29 eP :05.16 ( 1.08 ) TVA ABTN 407.9 320 iP :04.80 (-2.77 ) eS :44.10 (-4.14X) TVA LAL 409.2 293 eP :09.70 ( 1.97 ) eS :51.70 ( 3.20X) CERI BBG 194.7 344 eP+ 05:10:42.28 ( 0.47 ) eS 05:11:04.46 (-0.07 ) CERI GMG 228.9 325 eP :47.06 ( 0.04 ) eS :13.38 (-0.16 ) CERI WSSR 234.1 352 eP- :47.40 (-0.44 ) eS :14.96 ( 0.00 ) CERI RBNC 241.5 5 eP :49.12 ( 0.10 ) eS :16.74 (-0.26 ) CERI ETT 262.9 335 eP- :51.50 ( 0.02 ) eS :21.24 (-0.01 ) CERI TKL 278.7 350 eP- :52.92 (-0.45 ) CERI RCG 278.9 316 eS :25.72 ( 1.12X) CERI GBTN 289.5 342 eP- :54.60 (-0.09 ) eS :27.06 ( 0.25 ) CERI TQTN 293.0 332 eP :55.20 ( 0.10 ) eS :29.50 ( 1.98X) CERI BRBC 295.7 17 eP :56.40 ( 0.74 ) CERI LMTN 299.8 357 iP :55.51 (-0.48 ) eS :29.60 ( 0.54 ) CERI CRTN 338.9 351 eP :11:00.60 (-0.15 ) CERI PKNC 369.2 30 eP :05.16 ( 0.67 ) CERI ABTN 399.7 319 iP :04.80 (-3.37X) eS :44.10 (-6.03X) CERI LAL 405.4 291 eP :09.70 ( 0.84 ) eS :51.70 ( 0.38X) Additional Data: GIT ATL P 05:10:27.3 S 05:10:38.0 ***** 1991 JANUARY 9; 09:49 - LAKE SINCLAIR, GEORGIA ***** CERI For informational purposes only. SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I GIT 910109 0949 33.252 83.303 1.0F 3 0.8 F CERI 910109 094940.3 33.156 83.299 17.2 13 196 309 0.3 D D/D 2.9 78 1.6 2.1 C 2.1 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI BBG 196.3 346 eP- 09:50:11.56 (-0.02 ) eS 09:50:34.38 (-0.02 ) CERI GMG 227.8 327 eP :16.54 ( 0.17 ) eS :42.62 (-0.07 ) CERI WSSR 236.7 354 eP :16.96 (-0.63 ) eS :44.18 (-0.61X) CERI RBNC 245.8 7 eP+ :19.26 ( 0.51 ) eS :47.00 ( 0.19 ) CERI ETT 263.2 336 eP- :20.72 ( 0.00 ) eS :50.64 ( 0.43 ) CERI RCG 276.5 317 eS :53.56 ( 0.56X) CERI TKL 281.0 351 eP :22.18 (-0.68 ) eS :53.52 (-0.40 ) CERI GBTN 290.8 343 eP :23.80 (-0.26 ) eS :56.44 ( 0.46X) CERI BRBC 301.3 18 eP :25.32 (-0.23 ) Additional Data: GIT ATL P 09:49:58.0 S 09:50:08.3 ***** 1991 JANUARY 15; 08:48 - LAKE SINCLAIR, GEORGIA ***** CERI For informational purposes only. SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I GIT 910115 0848 33.252 83.303 1.0F 3 0.8 F CERI 910115 084822.5 33.204 83.205 11.6 22 194 279 0.3 D C/D 1.5 43 1.3 2.0 B 3.2 TVA 910115 084823.1 33.207 83.132 0.3 13 195 264 0.7 D D/D 6.7 -20 1.7 6.0 D 3.0 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI BBG 193.5 343 eP- 08:48:53.90 ( 0.40 ) eS 08:49:16.22 ( 0.07 ) CERI GMG 228.4 324 eP :58.70 (-0.12 ) eS :25.08 (-0.27 ) CERI WSSR 232.6 352 eP+ :59.06 (-0.43 ) eS :26.68 ( 0.17 ) CERI TRYN 245.3 21 eP+ :49:01.34 ( 0.03 ) CERI ETT 262.1 334 iPd :03.22 (-0.09 ) eS :32.90 (-0.22 ) CERI LKGA 262.2 308 iP :03.70 ( 0.36 ) iS :33.40 ( 0.23 ) CERI TKL 277.3 349 eP- :04.62 (-0.52 ) eS :36.88 ( 0.59X) CERI RCG 278.8 315 eP+ :05.00 (-0.34 ) eS :36.22 (-0.41 ) CERI GBTN 288.4 342 ePc :06.22 (-0.28 ) CERI BRBC 293.6 16 eP :07.90 ( 0.55 ) CERI BENN 297.9 28 eP :07.90 ( 0.17 ) CERI RICH 303.3 7 eP :08.92 ( 0.52 ) CERI PDTN 334.8 314 iP :11.60 (-0.57 ) iS :48.50 ( 0.06 ) CERI CRTN 337.4 350 eP :12.30 (-0.21 ) eS :50.40 ( 1.36X) CERI GFM 347.0 21 eP :14.10 ( 0.26 ) CERI PKNC 366.9 30 eP :16.56 ( 0.40X) CERI SLTN 372.8 15 iP :17.10 ( 0.31X) iS :57.40 ( 0.96X) CERI ABTN 399.4 319 eP :20.00 (-0.08X) eS :50:01.80 (-0.32X) CERI LAL 406.3 291 eS :03.00 (-0.56X) CERI PLVA 427.1 25 eP :23.16 (-0.43X) TVA BBG 195.3 341 eP- 08:48:53.90 (-1.04 ) eS 08:49:16.22 (-1.32 ) TVA GMG 232.2 323 eP :58.70 (-0.73 ) eS :25.08 (-0.12 ) TVA WSSR 233.4 350 eP+ :59.06 (-0.54 ) eS :26.68 ( 1.18 ) TVA TRYN 242.7 19 ePc :49:01.34 ( 0.66 ) TVA ETT 264.8 333 iPd :03.22 (-0.12 ) eS :32.90 ( 1.00 ) TVA LKGA 267.5 307 iP :03.70 ( 0.02 ) iS :33.40 ( 0.93 ) TVA TKL 278.3 348 iP :04.90 (-0.06X) iS :35.00 ( 0.34X) TVA RCG 283.4 314 eP+ :05.00 (-0.60X) eS :36.22 ( 0.46X) TVA GBTN 290.3 340 ePc :06.22 (-0.21X) TVA BRBC 291.5 15 eP :07.90 ( 1.12X) TVA BENN 294.5 27 eP :07.90 ( 0.89 ) TVA RICH 302.3 5 eP :08.92 ( 0.95X) TVA CRTN 338.3 349 eP :12.30 (-0.02X) eS :50.40 ( 3.15X) TVA PDTN 339.5 313 iP :11.60 (-0.84X) iS :48.50 ( 1.05X) TVA GFM 344.3 20 eP :14.10 ( 0.89X) TVA PKNC 363.3 29 eP :16.56 ( 1.15X) TVA SLTN 370.8 14 iP :17.10 ( 0.71X) iS :57.40 ( 3.19X) TVA ABTN 403.7 318 eP :20.00 (-0.29X) eS :50:01.80 ( 0.92X) TVA LAL 412.5 290 eP :36.00 eS :03.00 ( 0.28 ) TVA PLVA 423.9 25 eP :23.16 ( 0.26X) Additional Data: GIT CDG P 08:48:38.9 GIT ATL P :45 ***** 1991 JANUARY 16; 15:26 - LAKE SINCLAIR, GEORGIA ***** CERI For informational purposes only. SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I GIT 910116 1526 33.252 83.303 1.0F 3 0.8 F CERI 910116 152639.4 33.171 83.264 21.7 10 196 304 0.1 C B/D 1.0 54 0.6 0.7 A 2.7 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI BBG 195.6 345 eP 15:27:10.52 (-0.05 ) eS 15:27:33.38 ( 0.05 ) CERI GMG 228.3 326 eP :15.24 ( 0.06 ) eS :41.26 (-0.04 ) CERI WSSR 235.5 353 eP :16.04 (-0.07 ) eS :41.94 (-0.97X) CERI TRYN 250.7 22 eP :17.96 ( 0.05 ) eS :44.06 (-1.96X) CERI ETT 263.1 336 eP :19.82 ( 0.45X) eS :49.06 ( 0.51X) CERI RCG 277.6 317 eP :20.60 (-0.54X) eS :54.00 ( 2.40X) CERI TKL 280.0 350 eP :21.30 (-0.11 ) eS :51.84 (-0.23 ) CERI GBTN 290.2 343 eP :22.82 ( 0.16 ) eS :55.26 ( 1.03X) CERI BRBC 298.7 17 eP :24.36 ( 0.45X) eS :28:00.80 ( 4.40X) CERI RICH 307.6 8 eP :25.70 ( 0.83X) eS :04.84 ( 6.78X) CERI GFM 352.5 22 eP :30.50 ( 0.05 ) CERI PKNC 372.9 31 eP :29.78 (-3.05X) eS :19.76 ( 7.94X) CERI PLVA 432.8 26 eP :40.76 ( 0.54X) CERI PWLA 486.4 296 eS :43.98 ( 8.29X) Additional Data: GIT ATL P 15:26:56 S 15:27:07 GIT CDG P :27:12.8 S :37 ***** 1991 JANUARY 18; 02:05 - LAKE SINCLAIR, GEORGIA ***** CERI For informational purposes only. SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I GIT 910118 0205 33.252 83.303 1.0F 3 0.8 F CERI 910118 020537.2 33.230 83.228 18.9 14 190 295 0.2 D C/D 1.7 56 1.5 1.2 B 2.6 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI BBG 190.2 344 eP 02:06:07.68 ( 0.18 ) eS 02:06:29.52 (-0.12 ) CERI GMG 224.9 324 eP :12.64 (-0.15 ) eS :38.70 (-0.09 ) CERI WSSR 229.5 352 eP :12.84 (-0.55 ) eS :40.18 ( 0.34 ) CERI TRYN 243.4 22 eP :15.04 ( 0.00 ) eS :42.52 (-0.16 ) CERI ETT 258.6 334 iPd :16.96 ( 0.12 ) eS :47.00 ( 1.20 ) CERI TKL 274.1 350 eP :18.38 (-0.33 ) CERI GBTN 285.0 342 eP+ :19.96 (-0.08 ) CERI BENN 296.4 29 eP :21.84 ( 0.33 ) CERI RICH 300.7 7 eP :22.66 ( 0.61X) CERI GFM 345.2 22 eP :28.20 ( 0.62 ) Additional Data: GIT ATL P 02:05:52.2 S 02:05:04 GIT CDG P :06:09.8 S :06:33.7 ***** 1991 JANUARY 27; 02:20 - LAKE SINCLAIR, GEORGIA ***** CERI For informational purposes only. SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I GIT 910127 0220 33.252 83.303 1.0F 3 0.8 F CERI 910127 022034.9 33.231 83.247 20.4 12 190 295 0.2 D C/D 2.1 53 1.4 1.2 B 3.1 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI BBG 189.6 344 eP- 02:21:05.24 ( 0.09 ) eS 02:21:27.08 (-0.15 ) CERI GMG 223.7 324 eP :10.22 (-0.03 ) eS :36.02 (-0.03 ) CERI WSSR 229.1 352 eP- :10.52 (-0.44 ) eS :37.70 ( 0.43 ) CERI TRYN 244.0 22 eP+ :12.70 (-0.01 ) eS :40.14 (-0.17X) CERI ETT 257.7 335 iPd :14.54 ( 0.20 ) eS :42.98 (-0.15X) CERI TKL 273.7 350 eP- :15.98 (-0.29 ) eS :47.04 ( 0.58 ) CERI RCG 273.9 316 eP :16.32 ( 0.01X) CERI GBTN 284.3 342 eP+ :17.48 (-0.09 ) eS :49.52 ( 0.82X) CERI BENN 297.2 29 eP+ :19.32 ( 0.11 ) CERI GFM 345.7 22 eP :25.14 (-0.11X) CERI PKNC 366.4 31 eP :27.84 ( 0.18X) CERI PLVA 426.1 26 eP :36.02 ( 0.98X) CERI PWLA 484.9 295 eP :42.06 (-0.01X) Additional Data: GIT ATL P 02:20:50.2 S 02:21:01.5 GIT CDG P :21:07.1 S :31.7 ***** 1991 FEBRUARY 7; 04:03 - LAKE SINCLAIR, GEORGIA ***** CERI For informational purposes only. SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I GIT 910207 0403 33.252 83.303 1.0F 3 0.8 F CERI 910207 040314.3 33.195 83.183 8.0 18 195 265 0.5 D D/D 3.6 13 2.5 3.3 C 3.1 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI BBG 195.0 343 eP- 04:03:46.56 ( 0.75 ) eS 04:04:08.36 (-0.43 ) CERI GMG 230.4 324 eP- :51.32 ( 0.12 ) eS :17.40 (-0.71 ) CERI WSSR 233.9 351 eP+ :51.46 (-0.30 ) eS :18.72 (-0.37X) CERI TRYN 245.5 20 eP+ :53.66 ( 0.16 ) eS :21.04 (-1.06X) CERI ETT 263.8 334 eP- :55.62 (-0.16 ) eS :25.24 (-0.79 ) CERI TKL 278.6 349 iP- :56.84 (-0.72 ) eS :29.42 ( 0.30 ) CERI RCG 280.9 315 eP :57.36 (-0.49 ) eS :30.34 ( 0.72 ) CERI GBTN 289.9 341 iPd :58.74 (-0.20 ) CERI BENN 297.8 28 eP :04:00.00 ( 0.02 ) eS :33.44 ( 0.14X) CERI GFM 347.2 21 eP :06.02 (-0.10 ) CERI SMTN 353.6 0 eP :07.26 ( 0.49X) CERI PKNC 366.8 30 eP :08.72 ( 0.33 ) eS :47.60 (-0.26X) CERI PLVA 427.1 25 eP :15.70 (-0.14 ) CERI PWLA 492.0 295 eP- :23.22 (-0.40 ) Additional Data: GIT ATL P 04:03:31.7 S 04:03:43.2 GIT CDG P :48.5 S :11.9 ***** 1991 FEBRUARY 7; 09:01 - LAKE SINCLAIR, GEORGIA ***** CERI For informational purposes only. SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I GIT 910207 0901 33.252 83.303 1.0F 3 0.8 F CERI 910207 090127.7 33.192 83.141 19.6 12 197 304 0.1 D C/D 1.1 78 0.6 0.7 A 2.0 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI BBG 196.6 342 eP 09:01:59.02 ( 0.01 ) eS 09:02:21.86 ( 0.00 ) CERI GMG 233.0 323 eP :02:04.30 ( 0.04 ) eS :30.40 (-0.54X) CERI WSSR 234.9 350 eP :04.40 (-0.12 ) eS :31.16 (-0.24 ) CERI TRYN 244.5 19 eP :05.72 ( 0.08 ) eS :33.46 ( 0.12 ) CERI ETT 265.9 333 eP- :08.08 (-0.13 ) eS :38.08 ( 0.30 ) CERI TKL 279.7 348 eP :09.56 (-0.32X) eS :40.82 ( 0.16 ) CERI RCG 283.9 315 eS :42.44 ( 0.87X) CERI GBTN 291.5 341 eP :11.22 (-0.10 ) eS :43.50 ( 0.35 ) CERI GFM 346.1 20 eP :19.28 ( 1.11X) Additional Data: GIT ATL P 09:01:45.0 S 09:01:55.2 ***** 1991 FEBRUARY 7; 13:15 - LAKE SINCLAIR, GEORGIA ***** CERI For informational purposes only. SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I GIT 910207 1315 33.252 83.303 1.0F 3 0.8 F CERI 910207 131500.7 33.197 83.181 13.7 9 195 303 0.1 D C/D 2.3 56 1.1 2.7 C 2.0 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI BBG 194.9 343 eP 13:15:31.66 (-0.11 ) eS 13:15:54.48 ( 0.00 ) CERI GMG 230.3 324 eP :37.24 ( 0.06 ) eS :16:02.90 (-0.93X) CERI WSSR 233.7 351 eP :38.00 ( 0.28 ) eS :05.26 ( 0.49X) CERI TRYN 245.3 20 eP :39.24 (-0.02 ) eS :07.34 (-0.09X) CERI ETT 263.7 334 eP :40.82 (-0.65 ) eS :11.36 ( 0.10 ) CERI TKL 278.5 349 eS :14.22 (-0.11 ) CERI RCG 280.9 315 eS :16.30 ( 1.44X) CERI GBTN 289.8 341 eP- :43.92 (-0.71X) eS :16.18 (-0.54 ) CERI GFM 347.0 21 eP :53.16 ( 1.36X) Additional Data: GIT ATL P 13:15:18.0 S 13:15:29.0 ***** 1991 APRIL 2; 10:41 - DAWSONVILLE, GEORGIA ***** CERI Possibly related to Lake Sidney Lanier near Gainesville, GA; for informational purposes only. SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 910402 104134.6 34.439 84.082 14.8 4 54 314 0.1 D D/D 12.3 -37 5.6 99.0 D 1.7 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI BBG 54.3 27 eP 10:41:44.00 (-0.10 ) eS 10:41:51.04 ( 0.00 ) CERI WSSR 103.9 26 eP :52.02 ( 0.33 ) CERI ETT 104.1 341 eP :51.66 (-0.01 ) eS :42:04.48 ( 0.35X) Additional Data: GIT CDG P 10:41:42.4 S 10:41:49.6 ***** 1991 APRIL 29; 18:41 - MONTICELLO RESERVOIR, SOUTH CAROLINA ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I USC 910429 184107.7 34.331 81.317 0.5 5 2 146 0.1 1.2 360 1.2 8.6 2.0 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC MR10 2.0 289 iP 18:41:08.10 ( 0.01 ) USC MR07 4.5 351 iP :08.50 ( 0.00 ) USC MR05 7.2 193 iP :08.90 (-0.04 ) USC JSC 7.7 137 iP :09.00 (-0.06 ) USC MR02 17.3 152 iP :10.70 ( 0.10 ) ***** 1991 MAY 2; 10:35 - MONTICELLO RESERVOIR, SOUTH CAROLINA ***** CERI For informational purposes only. SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 910502 103518.6 34.307 81.203 4.8 8 143 317 0.4 D D/D 33.6 -25 4.1 54.9 D 0.7 USC 910502 1035 34.331 81.325 10 1.2 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI TRYN 143.0 318 eP 10:35:42.64 ( 0.36 ) eS 10:35:59.84 ( 0.26 ) CERI BENN 145.7 343 eP :42.08 (-0.61 ) eS :36:00.08 (-0.21 ) CERI BRBC 187.1 328 eP :48.68 (-0.44X) eS :10.00 (-1.43X) CERI PKNC 193.0 1 eP :50.42 ( 0.50 ) eS :13.36 ( 0.56 ) CERI RBNC 200.4 306 eS :13.74 (-1.19 ) CERI RICH 231.7 321 eP :56.36 ( 0.50X) eS :22.48 (-0.60 ) CERI BBG 247.4 285 eP :59.00 ( 0.70X) eS :25.32 (-1.98X) ***** 1991 JULY 1; 17:48 - LAKE JOCASSEE, NORTH CAROLINA ***** USC This event may be related to Jocassee reservoir activity (location is 15 km north of the reservoir). SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I USC 910701 174808.7 35.092 82.980 1.8 4 9 308 0.0 C A/D 2.0 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC BC 9.4 210 P 17:48:10.30 (-0.04 ) S 17:48:11.10 (-0.43X) USC BG3 11.8 158 P :10.70 (-0.02 ) S :13.10 ( 0.91X) USC SMT 17.9 177 P :11.70 ( 0.00 ) S :14.03 ( 0.15X) USC MMC 35.1 170 P :14.55 ( 0.08 ) S :18.65 (-0.03X) ***** 1991 JULY 15; 09:00 - LAKE KEOWEE, SOUTH CAROLINA ***** VTSO Comments received from CERI, GIT, TVA, and USC, indicate some disagreement on the nature of this event. While there is a quarry in the area, because of the time of occurrence (3 a.m. local time) and its proximity to Keowee Reservoir, it has been classified as natural and probably reservoir induced. SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 910715 090008.3 34.505 82.724 12.7 6 95 265 0.1 D D/D 4.2 -18 1.2 84.8 D 1.5 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI TRYN 95.2 27 eP 09:00:24.22 ( 0.04 ) eS 09:00:38.48 ( 2.72X) CERI RBNC 97.5 346 eP :24.68 ( 0.06 ) CERI BBG 107.7 293 eP :26.18 ( 0.05 ) eS :41.66 ( 2.53X) CERI WSSR 115.9 318 eP :27.24 (-0.16 ) eS :47.84 ( 6.51X) CERI BRBC 142.6 16 eP :31.40 (-0.14 ) eS :52.66 ( 4.17X) CERI RICH 157.1 357 eP :34.28 ( 0.60 ) CERI TKL 159.8 324 eP :34.76 ( 0.73X) CERI GBTN 187.0 314 eP :37.40 (-0.79X) CERI GFM 196.8 25 eP :37.96 (-1.85X) ***** 1991 AUGUST 9; 01:35 - CLARK HILL RESERVOIR, SOUTH CAROLINA ***** CERI For informational purposes only; event possibly associated with Clark Hill Reservoir. GIT/TVA No event recorded at this time. SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CERI 910809 013529.2 33.981 82.507 15.0 8 145 317 0.1 D C/D 1.3 -30 0.7 60.0 D 0.7 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CERI TRYN 144.7 9 eP 01:35:53.46 ( 0.96X) eS 01:36:09.42 (-0.10 ) CERI BBG 155.6 310 eP+ :54.26 ( 0.06 ) eS :12.40 (-0.06 ) CERI RBNC 158.9 344 eS :13.80 ( 0.38 ) CERI WSSR 174.3 326 eP :57.02 (-0.04 ) eS :17.32 (-0.10 ) CERI BRBC 196.1 6 eS :24.04 ( 0.74X) CERI RICH 217.0 353 eP :36:03.18 (-0.39 ) eS :29.80 ( 1.13X) CERI TKL 219.3 328 eS :29.56 ( 0.36 ) CERI ETT 232.8 310 eS :31.58 (-1.22X) ***** 1991 NOVEMBER 17; 21:11 - LAKE JOCASSEE, SOUTH CAROLINA ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I USC 911117 211131.5 34.941 82.957 0.0 4 2 145 0.1 0.8 360 0.8 6.6 2.4 CERI 911117 211131.6 34.979 82.928 7.5 9 42 203 0.2 D D/D 2.7 -2 1.2 3.7 C 2.9 SRCE STA DIST(KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC SMT 1.7 228 iPd 21:11:31.90 ( 0.02 ) USC BG3 6.2 22 iPu :32.55 (-0.12 ) USC BC 10.9 322 iPd :33.50 ( 0.04 ) USC MMC 18.3 167 iPu :34.60 (-0.07 ) USC PRM 109.7 150 iPd :48.85 (-0.56X) USC MR10 162.2 114 ePd :58.25 ( 0.37X) USC JSC 171.3 115 iPd :59.20 (-0.10X) USC MR02 178.1 117 ePd :12:04.50 ( 4.32X) CERI RBNC 42.3 353 iPd 21:11:39.10 ( 0.01 ) eS 21:11:44.42 (-0.14X) CERI WSSR 67.9 299 eP :43.04 (-0.25 ) eS :50.84 (-0.98X) CERI TRYN 69.9 63 eP :43.70 ( 0.11 ) eS :52.26 (-0.09X) CERI BRBC 102.6 34 eP :48.72 (-0.28 ) eS :12:02.38 ( 0.67X) CERI RICH 104.8 5 eP :49.84 ( 0.58 ) CERI GBTN 139.4 304 iP :54.76 ( 0.27 ) CERI ETT 144.4 286 eP :54.56 (-0.72 ) eS :18.26 ( 5.69X) CERI SMTN 157.4 352 eP :59.40 ( 2.11X) eS :21.32 ( 5.28X) CERI GMG 159.7 266 eP :57.94 ( 0.26 ) CERI RCG 221.0 271 eP :12:07.54 ( 0.54 ) APPENDIX A Definitions and Operator Listing Below are some entries in this Bulletin that might require definition. Also given is a detailed listing of agencies or groups (and their letter codes) that supply information to this Bulletin. AZM: Azimuthal angle from epicenter to station as measured from north (in deg), DEP: Focal depth estimate (in km); FXD indicates that the depth was held fixed during the epicentral determination, DIST(KM) Epicentral distance (in km) between the epicenter and a station, ERROR ELLIPSE: Semi-axes, expressed as lengths (km) and azimuths (deg), of the vertical projection of the error ellipsoid (Lahr, 1980). Horizontal axes are expressed as the semi-major axis (ERHMAX), it's azimuth (AZ), and the semi-minor axis (ERHMIN). The vertical axis (ERZ) is the largest vertical deviation of the error ellipsoid from the hypocenter. A quality measure (Q) for the ellipsoid based on the length of the largest semi-axis (ERHMAX, ERHMIN, or ERZ) may also be supplied. For this Bulletin the following statistics apply for error estimates: CERI, TVA, and VTSO: Error ellipse projected semi-axes from HYPOELLIPSE corresponding to a chi-square statistic (68%) with one degree of freedom, GIT: Error ellipse projected semi-axes from LOCA, and USC: Standard error estimates from HYPO71. NEIC and USGS: Unknown, GAP: The largest azimuthal separation (in deg) between recording stations, HYPOELLIPSE: Computer hypocenter location program (Lahr, 1980), HYPO71: Computer hypocenter location program (Lee and Lahr, 1974), LOCA: Computer hypocenter location program developed at the Georgia Institute of Technology, MBN or mb(Lg): Body wave magnitude determination using Nuttli's formulas for the Lg phase (Nuttli, 1973), MD, MDB, MDL: Duration/coda length magnitude that approximates either the mb, ML, or an unknown magnitude scale, respectively. As of June 1986 (SEUSSN Bulletin 17), those using a duration magnitude approximating mb(Lg) are CERI, DGS, GIT, TVA and VTSO. Specifically: CERI: MDB = -2.36 + 2.23 Log(D) + 0.12 Log(K) (MDB > 2.6) MDB = -3.38 + 2.74 Log(D) (MDB < 2.7) VTSO, TVA, and GIT: MDB = -3.45 + 2.85 Log(D) where D is signal duration measured from the P-wave arrival time to the time when the signal returns to background noise, and K is the epicentral distance in kilometers. Those using a duration magnitude approximating ML are USC and USGS. Specifically: USGS: MDL = -0.87 + 2.0 Log(D) + 0.0035 X where D is signal duration measured from the P-wave arrival time to the time when the signal returns to twice background noise, and X is the epicentral distance in kilometers. For more information please see SEUSSN Bulletin 17 (page 1) or contact the agency making the estimate for details on their specific procedure, ML: Local magnitude; contact the agency or group making the estimate for details on their specific procedure, NO: Number of P, S, and S-P readings used in locating the event, PHASE: Phase descriptions for either P or S waves, or S-P times. Included under this heading may also be the descriptors; 'i' for an impulsive arrival or 'e' for an emergent arrival. Preliminary first motions may also be given for P wave polarities. These include; 'u', 'c', or '+' for a compressional first arrival, and 'd' or '-' for a dilatational first arrival. '?' indicates that the arrival time is questionable. Q: Solution quality of the hypocenter (the average of the SQD quality measures, see below; Lee and Lahr, 1974), RES: Arrival time residual (the difference between the observed and the calculated arrival time, in seconds). An "X" following the value of the arrival time residual means that the arrival time was not used to compute the location of that event, RMS: Root-mean-square of the weighted arrival time residuals (in sec), S-P: Difference between the S and P wave arrival times (in sec), SQD: Measures of the statistical quality of the solution (S), and of the distribution of stations (D) around the hypocenter (Lee and Lahr, 1974), *XXXX: Code indicating the agency or group that made the hypocentral/magnitude determination; a listing of agencies and groups that operate seismographs in the SEUSSN and/or who supply information to this BULLETIN follows. OPERATOR CODES CERI - Center for Earthquake Research and Information, TN (formerly Tennessee Earthquake Information Center, TEIC, changed 1 July 1987) CPL - Carolina Power and Light Company, NC CSU - Charleston Southern University, SC (formerly BCC, Baptist College at Charleston, SC, changed 1991) DGS - Delaware Geological Survey, DE DPC - Duke Power Company, SC DUP - E. I. DuPont de Nemours and Company, Inc., SC GIT - Georgia Institute of Technology, GA GSA - Geological Survey of Alabama, AL GSW - Georgia Southwestern College, GA NASA - National Aeronautics and Space Administration/ Goddard Space Flight Center, WV NEIC - National Earthquake Information Center, USGS, CO SCEG - South Carolina Electric and Gas Company, SC SLU - St. Louis University, MO SRL - Savannah River Labs, SC TCC - Tidewater Community College, VA TVA - Tennessee Valley Authority, TN UFL - University of Florida, FL UNC - University of North Carolina, NC USC - University of South Carolina, SC USGS - United States Geological Survey, CO UTM - University of Tennessee at Martin, TN VDMR - Virginia Division of Mineral Resources, VA VP - Virginia Power, VA VTSO - Virginia Tech Seismological Observatory, VA VSCC - Volunteer State Community College, TN WAL - Washington and Lee University, VA WVGS - West Virginia Geological and Economic Survey, WV WVU - West Virginia University, WV APPENDIX B Seismic Stations Operating During Report Period Stations operating in the SEUSSN during the report period are listed below. A listing of operator codes with their definition may be found at the end of Appendix A. Changes to the network (new stations, stations that have been closed, etc.) may be found at the end of the station listing. Bulletin 11 contained a complete Station Information Appendix that gave detailed information on the operators, type of seismographs, response characteristics, recording formats, etc. Subsequent bulletins have presented only changes in the network. After the station listing is a plot of those stations, followed by maps of individual networks (with station identification codes) operated by major member agencies or groups of the SEUSSN. Sta. Lat. N Lon. W Elev. Dates Current Code (Dg-Min) (Dg-Min) (M) Open-Close Operator Locality ABTN 35-53.13 86-06.54 363 8409- TVA Auburntown, TN AMG 32-03.56 84-13.06 122 7309- GSW Americus, GA ANTN 36-10.30 85-13.88 612 8305- TVA Anderson, TN ATL 33-26.00 84-20.25 272 6306- GIT Atlanta, GA BAV 37-13.32 80-25.50 622 7309- VTSO Blacksburg, VA BBD 39-20.50 75-40.60 18 7201-9104 DGS Blackbird, DE BBG 34-52.44 83-48.66 1355 8201- CERI Brasstown Bald, GA BC 35-01.06 83-01.88 860 8701- DPC Bad Creek Res., SC BCS 32-58.78 80-03.92 9 8701- CSU -USGS Charleston Southern Univ., SC BENN 35-33.90 81-39.66 878 8201- CERI Benn Knob, NC BG3 34-59.58 82-55.90 366 - DPC Lake Jocassee, SC BHT 35-50.82 84-56.70 826 8110- CERI Blowhole, TN BLA 37-12.68 80-25.21 634 6209- VTSO Blacksburg, VA BRBC 35-44.34 82-17.16 1976 8205- CERI Mt. Mitchell, NC BRTN 36-21.40 82-52.07 630 8606- TVA Brown Mtn., TN BVD 39-46.49 75-29.96 58 8502- DGS Bellevue State Park, DE BWD 39-47.96 75-34.60 63 8502- DGS Brandywine State Park, DE CBN 38-12.30 77-22.40 70 71 - USGS Corbin, VA CCVA 36-36.18 83-40.02 571 8211- CERI Cudjo Cave, VA CDG 34-36.65 84-40.00 332 - GIT Carters Dam, GA CEH 35-53.45 79-05.57 152 7508- UNC Chapel Hill, NC CFS 33-16.68 80-10.22 26 8805- USC -USGS Crossfire Tower, SC CNV 38-12.30 77-22.40 70 7807- VTSO Corbin, VA COW 33-22.90 80-41.96 60 7710- USC Cow Castle Creek, SC CRTN 36-11.99 83-50.44 488 8408- TVA Comb Ridge, TN CVL 37-58.88 78-27.65 167 7807- VTSO Charlottesville, VA CVV 37-58.88 78-27.65 167 7404- VDMR Charlottesville, VA DALG 34-46.43 85-00.47 329 9103- GIT Dalton, GA DRC 33-06.45 80-23.30 20 8303- CSU -USGS Dorchester, SC ETT 35-19.56 84-27.30 588 8111- CERI Etowah, TN FDKY 36-47.40 85-47.65 306 8703- TVA Freedom, KY FGTN 36-26.02 83-11.72 509 9112- CERI TN FRV 37-12.18 78-21.56 216 7812- VTSO Farmville, VA GAI 29-38.75 82-20.36 51 7711- UFL Gainesville, FL GBTN 35-39.96 84-12.66 326 8303- CERI Greenback, TN GBV 38-25.93 79-50.72 802 7711- NASA Green Bank, WV GFM 36-06.66 81-48.42 1726 8205- CERI Grandfather Mtn., NC GHV 37-47.65 78-06.44 107 7810- VTSO Goochland, VA GLT 36-21.72 86-29.88 159 8111- CERI-VCSS Gallatin, TN GMG 34-50.16 84-40.20 1097 8509- CERI Grassy Mtn., GA GTD 38-44.48 75-24.86 15 7704-9104 DGS Georgetown, DE HAKY 37-06.34 86-35.10 169 8706- TVA Hadley, KY HBF 32-56.85 80-19.96 10 7303- USC Harts Bluff, SC HPKT 35-55.56 83-52.74 305 8003- GIT -TVA Knoxville, TN HWD 32-44.33 80-17.01 9 8303- CSU -USGS Hollywood, SC HWV 37-35.43 80-50.45 521 7804- VTSO Hinton, WV JSC 34-16.90 81-15.62 120 7405- USC Jenkinsville, SC JVW 34-59.54 82-59.86 554 9111- USC Bad Creek Res., SC LAL 34-26.20 87-20.23 320 8903- TVA Leola, Alabama LEX 37-47.36 79-26.50 311 7105- WAL Lexington, VA LHS 34-28.57 80-48.37 120 7405- USC Liberty Hill, SC LKGA 34-37.40 85-28.33 655 8512- TVA Lookout Mtn., GA LMTN 35-53.21 83-24.59 610 8403-9109 TVA Little Mtn., TN MGS 32-53.87 80-08.46 9 7603- CSU -USC Middleton Gardens, SC MMC 34-46.79 82-54.91 280 8707- DPC Morgan Memorial Church, SC MOTN 36-37.08 87-59.20 177 8308- TVA Model, TN MRG 39-37.98 79-57.26 281 7511- WVU Morgantown, WV MR01 34-19.91 81-17.74 131 7711- USC -SCEG Monticello Res., SC MR02 34-11.58 81-13.81 84 7711- USC -SCEG Monticello Res., SC MR05 34-16.05 81-20.05 103 7807- USC -SCEG Monticello Res., SC MR07 34-22.32 81-19.50 134 7807- USC -SCEG Monticello Res., SC MR10 34-20.18 81-20.25 137 7807- USC -SCEG Monticello Res., SC MSAL 34-50.80 86-40.41 260 8307- TVA Monte Sano, AL MTT 33-45.02 81-38.40 182 7608- USC Monetta, SC NAV 37-18.94 80-47.61 610 7710- VTSO Narrows, VA NA2 38-07.62 77-44.82 82 7810- VTSO North Anna, VA NA5 38-00.65 77-44.19 76 7808- VTSO North Anna, VA NA12 37-58.98 77-52.77 125 7808- VTSO North Anna, VA NED 39-42.25 75-42.49 47 7211- DGS Newark, DE ONTN 36-28.89 84-26.60 635 8402- TVA Oneida, TN ORT 35-54.57 84-18.29 370 75 - TVA Oak Ridge, TN PBV 36-58.94 77-31.87 49 7811- VTSO Petersburg, VA PDTN 35-16.40 85-50.97 335 8509- TVA Piedmont, TN PKNC 36-02.76 81-09.48 785 8211- CERI Pores Knob, NC PLVA 36-39.98 81-09.63 1353 8211- CERI Point Lookout, VA PRM 34-04.98 82-21.78 254 7507- USC Parsons Mtn., SC PWLA 34-58.80 88-03.84 204 8005- CERI- SLU Pickwick Lake, AL PWV 37-20.09 81-02.93 820 7803- VTSO Princeton, WV RBNC 35-21.42 82-59.16 1829 8205- CERI Richland Balsam, NC RCG 34-58.50 85-20.88 468 8110- CERI Rock City, GA RGR 32-54.45 80-11.65 -52 8606- CSU -USGS (Roger Stewart) SC RICH 35-55.20 82-49.20 967 8306- CERI Rich Mtn., NC SGS 33-11.55 80-30.57 25 7303- USC St. George, SC SLTN 36-26.59 82-07.23 1280 8401- TVA Sullivan, TN SMT 34-55.85 82-58.26 498 7704- USC Smeltzer Mtn. (Jocassee), SC SMTN 36-22.92 83-10.92 768 8210-91 CERI Short Mtn., TN SRAV 33-19.50 81-40.80 - DUP Savannah River Lab, SC SRPD 33-09.30 81-42.75 31 7608- DUP Savannah River Lab, SC SRPN 33-19.74 81-35.33 95 7608- DUP Savannah River Lab, SC SRPW 33-12.14 81-34.69 77 7608- DUP Savannah River Lab, SC SVS 32-58.10 80-14.89 3 7603- USC Slandsville, SC TCT 36-00.32 87-33.17 245 8803- TVA Tennessee City, TN TKL 35-39.48 83-46.44 350 78 - CERI-TVA Tuckaleechee Caverns, TN TQTN 35-30.96 84-43.55 260 8607- TVA Tranquillity, TN TRYN 35-14.76 82-16.02 915 8303- CERI Tryon Peak, NC TWB 33-06.88 80-06.18 9 8803- CSU -USC Tillman's/White's Bay, SC VBV 36-47.12 76-06.48 5 7705- TCC Virginia Beach, VA VRN 33-02.19 80-56.39 30 7912- USC Varneville, SC VWV 37-27.96 80-23.50 963 8207- VTSO VA-WV Border WAS 32-50.81 80-16.30 9 8303- CSU -USGS West Ashley, SC WMTN 35-14.88 84-58.39 378 8507- TVA White Oak Mtn., TN WMV 37-06.51 80-58.23 1157 8210- VTSO Walker Mtn., VA WSSR 35-16.68 83-34.68 1340 8510- CERI Wesser Bald, NC YTN 35-27.45 87-07.91 349 8908-9110 TVA Yokley, TN CHANGES TO THE SEUSSN STATION LISTING Station Code Operator Locality Change BBD DGS Blackbird, DE Closed April 1991 DALG GIT Dalton, GA Relocated March 1991 FGTN CERI TN Opened in 1991 GTD DGS Georgetown, DE Closed April 1991 JVW USC Bad Creek, SC Opened November 1991 LMTN TVA Little Mtn., TN Closed September 1991 MR07 USC -SCEG Monticello Res., SC Updated latitude 1991 MR08 USC -SCEG Monticello Res., SC Closed March 1990 MR09 USC -SCEG Monticello Res., SC Closed March 1990 SMTN CERI Short Mtn., TN Closed in 1991 SRAV DUP Savannah River Lab, SC Added to list 1991 YTN TVA Yokley, TN Closed October 1991 Several station locations in the University of South Carolina network have changed slightly. Those modifications are due to respotting of the stations using the Magellan-GPS navigational systems. Stations for which new coordinates have been determined are: BCS, CFS, COW, DRC, HBF, HWD, JSC, LHS, MGS, MTT, PRM, RGR, SGS, SVS, TWB, VRN, and WAS. FIGURE 10. Seismic Stations (Open Triangles) Operating in the SEUSSN from January through December 1991. The SEUSSN monitoring area is outlined. FIGURE 11. Georgia Tech - Geological Survey Of Alabama Seismic Network. FIGURE 12. South Carolina Seismic Network. FIGURE 13. Center for Earthquake Research and Information - Southern Appalachian Regional Seismic Network. FIGURE 14. Tennessee Valley Authority Seismic Network. FIGURE 15. Virginia Tech Seismic Network. APPENDIX C Errata In Bulletin 25 Errata (page 55), it was noted that the event 30 September 1989 at 8:16Z was not related to Lake Sinclair activity but was tectonic in nature. The event being discussed was actually at 08:06Z (not 08:16Z). APPENDIX D The May 1991 Dawson County, Georgia, Earthquakes Leland Timothy Long School of Earth and Atmospheric Sciences Georgia Institute of Technology Atlanta, Georgia 30332 Introduction: In early May, 1991, many small earthquakes were felt in south Dawson County, Georgia. These events were too small to be recorded on regional stations but were reported to the Dawson County Sheriff's Department as suspected dynamite blasts. At the request of the Sheriff's Department, we placed a portable recorder in the area for three days and recorded two events. The probable dates and times for these and some of the other larger reported events are given in Table 1. Felt Data: A felt area of 4 square kilometers was constrained by four not-felt sites and nine felt sites. These sites are indicated on Figure D1 with the interpreted felt area and local geology. The typical report was that of a distant cannon or muffled dynamite shot accompanied by ground vibrations. Waves (microseich ?) were reported in a 50 foot diameter fish pond. The maximum intensity was interpreted as an MM III. Location: The portable recorder was located in the approximate center of the felt area. The S-P time for the May 17 event could only be constrained to less than 0.1 second, an equivalent distance of less than 1.0 kilometer. This maximum distance and the felt area constrain the epicenter to 84, 07' 45" west by 34 20' 30" north with an uncertainty of 1 kilometer. The audible attribute to these events would suggest an unusually shallow focus, likely less than 0.5 km. Relation to Geology: The felt area and likely epicenter are entirely underlain by an undifferentiated granite or granite gneiss which trends northeast-southwest parallel to the regional structure. Biotite gneiss crops out to the southeast and west of the felt area. The Chattahoochee thrust fault lies 2 km to the northwest and dips to the southeast, too far to be associated with these events. The hypocenters of these events are probably within the granite gneiss. Discussion: The small felt area, audible sound, shallow focus and association with a granite gneiss that characterized these small events is reminiscent of the reservoir induced events documented at Jocassee, South Carolina, and elsewhere in the southeastern United States. Although no obvious significant reservoir was found in the Dawson County earthquake epicenter area, the mechanism for these events is probably the same as that of reservoir induced events in the Piedmont Province. Acknowledgments: Mr. Maynard H. Waters, Jr., Chief Investigator for the Dawson County Sheriff's Department assisted in the field survey and instrumentation. Table D1. Probable Dates and Times for some of the Dawson County Events. May 10 (Friday) Felt between 10:30 and 12:00 a.m. local time May 11 (Saturday) Felt between 9:30 and 11:30 a.m. local time May 14 (Tuesday) Felt between 10:00 and 11:00 a.m. local time May 17 (Friday) Recorded at 20:07:10.9 UT, magnitude about 0; felt by resident at site of recorder May 20 (?) Time not recorded, magnitude about -0.5 Figure D1. Map of Felt Area and Local Geology. MAILING LIST