BULLETIN NUMBER 30 TABLE OF CONTENTS PAGE SEISMICITY OF THE SOUTHEASTERN UNITED STATES DURING 1995................... 1 Acknowledgments.......................................................................................... 2 References................................................................................................... 2 SEUSSN EARTHQUAKE CATALOG STATISTICS................................................. 7 SOUTHEASTERN U.S. EARTHQUAKES DURING 1995......................................... 13 SOUTHEASTERN U.S. RESERVOIR RELATED EARTHQUAKES DURING 1995.......... 23 SEISMIC STATION LISTING AND NETWORK MAPS............................................ 29 ACCESSING DIGITAL WAVEFORM DATA AND OTHER INFORMATION FROM THE VIRGINIA TECH SEISMOLOGICAL OBSERVATORY........................................... 37 DEFINITIONS AND NETWORK OPERATOR CODES............................................. 39 BIBLIOGRAPHY OF SOUTHEASTERN U.S. SEISMICITY...................................... 41 APPENDIX A: Abstracts of Papers Presented at Eastern Section, Seismological Society of America Meeting, 1995..................................................................................... 47 APPENDIX B: Dacula, Georgia, Earthquake Swarm.................................................. 51 MAILING LIST............................................................................................. 59 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 „ 3.0)................................................................................... 6 5. Focal Depth Distributions of Southeastern U.S. Earthquake.......................................8 6. Magnitude Distributions of Southeastern U.S. Earthquakes ...................................... 9 7. Magnitude Recurrence Relation for the Southeastern U.S. ...................................... 10 8. Cumulative Strain Factor Histories for the Southeastern U.S....................................11 9. Epicenter Density Contour Map (Scaled to Magnitude, M „ 2.0)................................12 10. Seismic Stations Operating During Report Period................................................ 31 11. Georgia Tech - Geological Survey of Alabama Seismic Network...............................32 12. South Carolina Seismic Network................................................................... 32 13. Center for Earthquake Research and Information - SARSN.................................... 33 14. Tennessee Valley Authority Seismic Network.................................................... 33 15. University of Florida Seismic Network........................................................... 34 16. Virginia Tech Seismic Network.....................................................................34 17. University of North Carolina-Chapel Hill Seismic Network....................................35 TABLES 1. SEUSSN Report Period/Cumulative Earthquake Catalog Statis7ics 2. Estimates of Completeness for the Southeastern United Sta9es SEISMICITY OF THE SOUTHEASTERN UNITED STATES DURING 1995 There were 32 earthquakes (0.0 * M * 3.9) located within the SEUSSN monitoring area during 1995. Of those, 12 had felt reports. Earthquakes reported included 2 in Alabama (1 felt; 28 May at 18:58, mb(Lg)= 3.4), 3 in Delaware (2 felt; both on 17 October at 02:12 and 08;51, both MD= 2), 15 in South Carolina (2 felt; largest on 17 April at 13:46, mb(Lg)= 3.9, MD= 3.2, MMI= VI), 5 in Tennessee (4 felt; largest on 5 July at 14:16, mb(Lg)= 3.7, MMI= IV), 5 in Virginia (3 felt; largest on 26 June at 00:36, mb(Lg)= 3.4, MD= 3.3, MMI= V), and 2 in West Virginia (none felt). Figures 1 and 2 are epicenter maps of tectonic earthquakes (M * 0) located within the region during the report period. Figures 3 and 4 are cumulative epicenter maps for the 18.5 year period from July 1977 through December 1995 (SEUSSN Bulletins 1through 30). SEUSSN EARTHQUAKE CATALOG STATISTICS includes report period and cumulative earthquake catalog statistics, focal depth distribution plots, magnitude distribution plots, estimates of catalog completeness, a magnitude recurrence relation, cumulative strain factor history plots, and an epicenter density contour map. SOUTHEASTERN U.S. EARTHQUAKES DURING 1995 lists hypocentral parameters, magnitudes, and arrival times for tectonic earthquakes (i.e., not reservoir related) in the southeastern United States. The largest earthquake for the report period was an mb(Lg)= 3.9 event (17 April 13:45) that caused slight damage in the Summerville, South Carolina, area. During the report period, South Carolina had the highest level of reported seismicity. The drop of reported activity in the eastern Tennessee area is due to the shutdown of the TVA network (discussed below). Realistically, the detection threshold in the eastern Tennessee area is currently at a level of felt. Appendix A includes three abstracts from the 1995 Eastern Section, Seismological Society of America Meeting, on the eastern Tennessee seismic zone. SOUTHEASTERN U.S. RESERVOIR ACTIVITY DURING 1995 lists hypocentral parameters for 31 earthquakes near the Monticello, Jocassee, Keowee, and Hartwell Reservoirs in South Carolina. SEISMIC STATION LISTING AND NETWORK MAPS contains a listing of seismic stations operating during the report period and maps showing the major network operators in the region. The number of stations operating during 1995 was 104. However, with the shut down of the TVA network on March 31, 1995 (discussed below), the number of stations operating during the last nine months of 1995 was 86; a 19% reduction from 1994. 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 and Kentucky - east of longitude 87 degrees West (see Figure 10). ACCESSING WAVEFORM DATA AND OTHER INFORMATION AT THE TECH SEISMOLOGICAL OBSERVATORY describes how to access, by the computer Internet, digital waveforms, earthquake catalogs, and other data from the Virginia Tech Seismological Observatory (see http://www.geol.vt.edu/outreach/vtso.html). The Maryland Geological Survey now has a home page (http://mgs.dnr.md.gov) which includes an earthquake pamphlet discussing the most recent seismicity in the area (e.g., the 1993 Howard County, MD, swarm). DEFINITIONS AND NETWORK OPERATOR CODES contains definitions of various terms and abbreviations used in the Bulletin as well as a listing of codes for network operators and/or contributors. APPENDIX A includes abstracts presented by members of the Observatory at the Eastern Section, Seismological Society of meeting held in October. APPENDIX B from the Georgia Institute of Technology is an of earthquake activity in the Dacula, Georgia, area from November 1995 through February 1996 submitted by Dr. L. T. Long. TENNESSEE VALLEY AUTHORITY has submitted data for the last time to the Bulletin as the regional seismic network ceased recording on March 31, 1995. The TVA regional seismic network data archives are presently stored at the University of Tennessee-Knoxville (UT-K) campus. Requests to review this data should be made to Dr. Rick Williams of UT-K, Geological Sciences Department. For the period January 1-March 31, only events which had the potential to be felt were located. Several other local and regional earthquakes were identified during this time, but not located by TVA. Therefore, this submission contains data on only two earthquakes. Over the last 13 years, the TVA network was critical to the monitoring of the most active zone in the region that was largely unrecognized prior to the installation of the regional networks in the early 1980's. Figure 10 indicates the current level of station coverage in eastern Tennessee. Acknowledgments This report is the thirtieth SOUTHEASTERN UNITED STATES SEISMIC NETWORK BULLETIN and covers the period from January through December, 1995. The organizations supplying data for this Bulletin are Auburn University, Charleston Southern University, Delaware Geological Survey, Georgia Institute of Technology, Maryland Geological Survey, University of Memphis (Center for Earthquake Research and Information), Tennessee Valley Authority, United States Geological Survey, University of Florida, University of North Carolina, University of South Carolina, Virginia Department of Mines, Minerals, and Energy - Division of Mineral Resources, Virginia Polytechnic Institute and State University (Virginia Tech Seismological Observatory), and the Westinghouse Savannah River Company. 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: National Science Foundation, United States Geological Survey, Tennessee Valley Authority, Virginia Power. Nuclear Regulatory Commission, Several of the plots in this report were generated using the Generic Mapping Tools (GMT) software package developed by Wessel and Smith (1991). 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. Wessel, P., and W. H. F. Smith, (1991), Free software helps map and display data, EOS Trans. Am. Geophys. Union, 72, pp. 441, 445-446. FIGURE 1. Epicenters (circles) for earthquakes (M * 0.0) in the southeastern United States for this report period. FIGURE 2. Epicenters (circles scaled to magnitude) for earthquakes (M * 0.0) in the southeastern United States for this report period. FIGURE 3. Epicenters (circles) for earthquakes (M * 0.0) in the southeastern United States from July 1977 through this report period. FIGURE 4. Epicenters (circles scaled to magnitude) for earthquakes (M * 3.0) in the southeastern United States from July 1977 through this report period. SEUSSN EARTHQUAKE CATALOG STATISTICS TABLE 1 SEUSSN Report Period/Cumulative Earthquake Catalog Statistics Period: January through December 1995 (1 year) Tectonic Reservoir Number of Earthquakes with M „ 0.0 32 31 Number of Earthquakes with M „ 2.0 18 5 Number of Earthquakes with M „ 3.0 7 0 Number of Earthquakes with M „ 4.0 0 0 Number of Felt Earthquakes 12 0 Rate of Earthquakes with M „ 0.0 (per year) 32 31 Rate of Earthquakes with M „ 2.0 (per year) 18 5.0 Rate of Earthquakes with M „ 3.0 (per year) 7 0.0 Rate of Earthquakes with M „ 4.0 (per year) 0 0.0 Rate of Felt Earthquakes (per year) 12 0.0 Mean Earthquake Magnitude 1.9 1.5 Median Earthquake Magnitude 2.1 1.5 Number of Earthquakes with Known Dmin Ύ 5.0 km 9 15 Number of Earthquakes with Known Dmin Ύ 10.0 km 17 21 Number of Earthquakes with Known Dmin Ύ 25.0 18 31 Number of Earthquakes with Known ERH Ύ 5.0 km 20 30 Number of Earthquakes with Known ERZ Ύ 5.0 km 14 26 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: 17 April 1995; 13:45Z - Charleston, SC mb(Lg)= 3.9, MD= 3.2, MMI= VI Period: July 1977 through December 1995 (18.5 years) Tectonic Reservoir Number of Earthquakes with M „ 0.0 1457 737 Number of Earthquakes with M „ 2.0 544 200 Number of Earthquakes with M „ 3.0 93 9 Number of Earthquakes with M „ 4.0 7 0 Number of Felt Earthquakes 195 21 Rate of Earthquakes with M „ 0.0 (per year) 83 40 Rate of Earthquakes with M „ 2.0 (per year) 31 11 Rate of Earthquakes with M „ 3.0 (per year) 5.3 0.5 Rate of Earthquakes with M „ 4.0 (per year) 0.4 0.0 Rate of Felt Earthquakes (per year) 11 1.1 Mean Earthquake Magnitude 1.7 1.4 Median Earthquake Magnitude 1.7 1.4 Number of Earthquakes with Known Dmin Ύ 5.0 km 120 101 Number of Earthquakes with Known Dmin Ύ 10.0 km 272 144 Number of Earthquakes with Known Dmin Ύ 25.0 km 782 195 Number of Earthquakes with Known ERH Ύ 5.0 km 1263 223 Number of Earthquakes with Known ERZ Ύ 5.0 km 1079 158 Number of Blasts or Questionable Events Reported 179 Number of Events Outside the SEUSSN Area Reported 17 Largest Earthquake: 27 July 1980; 18:52 - Sharpsburg, KY, mb= 5.2, MMI= VII FIGURE 5. Focal depth distributions 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 (M „ 0.0, known ERZ Ύ 5.0 km, Dmin Ύ 20 km, and free depth determination), while the lower half of the figure is a similar display for earthquakes reported during the period from July 1977 through this report period. 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. TABLE 2 Estimates of Completeness (Years) By Magnitude For The Southeastern United States And Subregions (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 United States. 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 United States. The maximum likelihood line includes 95% confidence intervals (Bollinger and others, 1989). FIGURE 8. Cumulative strain factor histories for the southeastern United States. 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 „ 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 25 events per 10,000 square km, respectively (contour interval is 5). SOUTHEASTERN U. S. EARTHQUAKES DURING 1995 Events are listed chronologically (this also applies to multiple hypocenter locations for the same event). All times are Universal Coordinated Time. Most entries in the listing are self-explanatory. Items that might require further explanation are defined in the section entitled DEFINITIONS AND NETWORK OPERATOR CODES. ***** 1995 JANUARY 22; 08:24 - PULASKI, VIRGINIA ***** NEIC Felt (V) at Pulaski; (III) at Draper, Hiwassee and Woodlawn, Virginia. VTSO Felt in Pulaski, Virginia (IV) and in the Newbern/Claytor Lake 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 950122 082448.7 37.050 80.789 9.3 9 30 2.7 5 VTSO 950122 082448.8 37.050 80.789 9.3 6 17 231 0.2 D C/D 2.5 4 1.3 9.3 D 2.9 2.8 4 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) NEIC NAV 30.0 359 eP 08:24:53.56 (-0.7 ) NEIC BLA 37.8 61 eP :55.14 (-0.5 ) NEIC CEH 199.0 130 ePc :25:20.56 ( 0.6 ) eS 08:25:43.40 ( X) NEIC CVL 230.2 63 eP :25.05 ( 1.0 ) eS :51.84 ( X) NEIC LHS 285.8 180 eP :31.21 ( 0.1 ) NEIC MCWV 301.3 16 P? :34.27 ( 1.1 ) eS :26:10.36 ( X) NEIC JSC 310.2 188 eP :35.05 ( 0.7 ) NEIC PRM 359.2 204 eP :41.48 ( 1.0 ) NEIC BINY 705.0 34 P? :26:27.03 ( 2.5 ) VTSO WMV 17.4 292 iPu 08:24:52.30 (-0.04 ) VTSO NAV 29.5 359 P :54.30 ( 0.11 ) VTSO BLA 37.4 61 P :55.28 (-0.19 ) eS 08:25:00.10 ( 0.12 ) VTSO HWV 60.2 356 P :59.40 ( 0.19 ) eS :06.20 (-0.20 ) VTSO SLTN 136.6 241 P :25:11.50 ( 0.22X) iS :29.50 ( 2.54X) VTSO BRTN 201.0 248 eP :21.40 ( 0.32X) eS :46.30 ( 2.66X) VTSO CVL 230.3 63 eP :25.50 (-0.03X) eS :52.00 ( 0.79X) VTSO GHV 251.3 70 eP :28.20 (-0.35X) eS :57.00 ( 0.51X) VTSO PBV 290.0 90 eP :33.00 (-0.27X) eS :26:04.50 (-0.07X) VTSO ETT 381.1 241 eP :44.40 (-0.08X) eS :27.40 ( 3.67X) VTSO ANTN 409.1 258 eP :53.70 ( 5.80X) eS :31.40 ( 1.82X) VTSO FDKY 446.9 268 P :52.85 ( 0.37X) S? :27:00.00 ( 2.59X) VTSO ABTN 493.9 256 eP :58.20 (-0.04X) eS :09.30 ( 2.04X) Additional Data: DGS magnitude 3.0 DGS NED 533 ePu 08:26:14.9 eS? 08:27:32.4 DGS BWD 548 ePu :15.5 eS? :34.1 ***** 1995 FEBRUARY 9; 19:14 - SINKING CREEK, 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 950209 191400.7 37.451 80.284 18.3 8 29 277 0.2 D C/D 2.1 60 1.4 4.9 C 2.3 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) VTSO BLA 29.2 204 iPd 19:14:06.73 ( 0.20 ) S 19:14:10.42 (-0.11 ) VTSO NAV 47.5 252 eP :08.84 (-0.36 ) S :15.03 (-0.02 ) VTSO HWV 51.6 288 eP? :09.93 ( 0.14 ) eS? :16.11 ( 0.02 ) VTSO WMV 71.7 238 eP :12.85 (-0.08 ) S :21.63 ( 0.25 ) ***** 1995 MARCH 2; 00:02 - CHARLESTON, 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 950302 000218.1 32.962 80.165 4.6 4 7 220 0.0 C 0.7 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC RGR 6.6 204 iPu 00:02:19.72 ( 0.00 ) iPd 00:02:20.75 (-0.24X) USC MGS 7.4 162 iPu :19.90 ( 0.00 ) iPd :20.85 (-0.46X) USC BCS 9.6 78 iPd :20.38 ( 0.00 ) iPu :22.50 ( 0.35X) USC WAS 16.2 218 iPd :21.30 ( 0.00 ) iPd :22.60 (-1.17X) ***** 1995 MARCH 18; 22:06 - DAYTON, 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 950318 220620.8 35.422 84.941 26.0 11 31 91 0.3 B B/B 0.6 -21 0.3 2.1 B 3.3 NEIC 950318 220621.0 35.425 84.922 17.0 13 43 3.3 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) TVA OLT 31.1 194 iP 22:06:27.50 ( 0.10 ) TVA ETT 45.4 103 iPd :29.30 (-0.01 ) iS 22:06:33.50 (-2.04X) TVA PDTN 84.2 259 iP :34.60 (-0.34 ) iS :44.80 (-0.49 ) TVA LKGA 101.0 209 iPc :37.70 ( 0.20 ) S? :47.35 (-2.36X) TVA ABTN 117.6 296 iP :40.20 ( 0.21 ) iS :54.50 ( 0.47 ) TVA CRTN 131.7 49 iP :41.90 (-0.25 ) iS :57.75 (-0.01 ) TVA FDKY 170.2 333 eP :48.50 ( 0.51 ) S? :07:08.65 ( 0.79 ) TVA MSAL 170.3 248 iP :47.65 (-0.35X) iS :08.30 ( 0.41X) TVA BRTN 214.0 60 eP :54.30 ( 0.54X) iS :18.70 ( 0.86X) TVA HAKY 238.2 322 eP :58.00 ( 1.35X) iS :24.45 ( 1.60X) TVA TCT 245.0 286 eP :58.85 ( 1.35X) iS :27.55 ( 3.24X) TVA MOTN 304.9 297 eP :07:10.40 ( 5.59X) eS :41.20 ( 4.24X) NEIC ETT 43.4 104 iP 22:06:29.30 ( 0.1 ) iS 22:06:33.50 ( X) NEIC PDTN 85.6 259 iP :34.60 (-1.0 ) iS :44.80 ( X) NEIC LKGA 102.3 210 iP :37.70 (-0.4 ) iS :47.35 ( X) NEIC CRTN 130.1 48 iP :41.90 (-0.5 ) iS :57.75 ( X) NEIC FDKY 170.1 333 iP :48.50 ( 0.8 ) S :07:08.65 ( X) NEIC MSAL 172.4 249 iP :47.65 (-0.2 ) iS :08.30 ( X) NEIC BRTN 212.4 60 eP :54.30 ( 1.1 ) iS :18.70 ( X) NEIC HAKY 239.1 322 eP :58.00 ( 1.4 ) iS :24.45 ( X) NEIC TCT 246.9 286 eP :58.85 ( 1.3 ) iS :27.55 ( X) NEIC MOTN 305.8 296 eP :07:10.40 ( 5.2 ) iS :41.20 ( X) NEIC MFTN 412.5 283 P? :20.12 ( 1.4 ) NEIC OXF 422.6 257 Pn? :16.93 (-3.0 ) NEIC FVM 568.2 302 Pn? :33.90 (-4.6 ) Additional Data: GIT CDG P 22:06:36.4 S 22:06:47.6 GIT ATL P :57.1 S :07:23.5 ***** 1995 MARCH 21; 18:25 - GREENEVILLE, TENNESSEE ***** TVA Felt (IV to V) in small area (2-4 sq km) of northeastern Greeneville, TN. 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 950321 182509.6 36.152 82.722 0.0 7 26 183 0.4 D C/D 1.0 -16 0.4 2.5 B 2.1 4 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) TVA BRTN 26.2 330 eP+ 18:25:14.40 ( 0.15 ) iS 18:25:17.40 (-0.25 ) TVA EGT 58.9 242 S-P 7.70 SEC ( 0.06 ) TVA SLTN 63.0 59 iPc :20.50 (-0.33 ) eS :30.00 ( 0.97 ) TVA CRTN 100.7 273 eP :27.30 ( 0.28 ) S? :38.50 (-1.24 ) ***** 1995 APRIL 10; 13:17 - CHARLESTON, SOUTH CAROLINA ***** CSU Between Middleton Place and Summerville, SC. Magnitude <1. No felt reports. 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 950410 131753.2 32.944 80.167 3.9 4 5 205 0.0 C 0.6 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC RGR 4.7 212 iPu 13:17:54.50 ( 0.00 ) USC MGS 5.6 154 iPd :54.69 ( 0.00 ) USC BCS 10.3 67 iPd :55.60 ( 0.00 ) USC WAS 14.5 222 iPd :56.12 ( 0.00 ) USC DRC 27.5 311 iPd :57.97 (-0.48X) Additional Data: CSU RGR P 13:17:57 ***** 1995 APRIL 10; 18:25 - CHARLESTON, SOUTH CAROLINA ***** CSU Between Middleton Place and Summerville, SC. Magnitude <1. No felt reports. 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 950410 182501.7 32.939 80.143 5.0 6 5 120 0.0 B 0.5 360 0.5 1.1 1.2 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC MGS 4.6 178 iPd 18:25:03.19 ( 0.02 ) USC RGR 5.9 234 iPd :03.28 (-0.02 ) USC BCS 8.5 58 iPd :03.85 (-0.03 ) USC WAS 15.8 230 iPd :04.88 (-0.01 ) USC TWB 19.8 11 iPd :05.74 ( 0.07 ) USC DRC 29.6 309 iPd :07.37 ( 0.03 ) Additional Data: CSU RGR P 18:26:02 ***** 1995 APRIL 15; 23:37 - MANNBORO, 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 950415 233713.3 37.267 77.845 5.0F 7 42 187 0.2 D D/D 3.0 65 0.7 19.3 D 1.8 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) VTSO PBV 42.2 138 iPd 23:37:20.22 (-0.06 ) S 23:37:25.31 (-0.06 ) VTSO GHV 62.9 338 eP :23.72 ( 0.05 ) iS :30.67 (-0.56 ) VTSO NA12 80.1 358 eP :26.62 ( 0.14 ) eS :36.25 ( 0.16 ) VTSO CVL 96.1 326 P :29.41 ( 0.30 ) iS :39.31 (-1.33X) ***** 1995 APRIL 17; 13:45 - SUMMERVILLE, SOUTH CAROLINA ***** NEIC Slight damage (VI) in the Summerville area. Felt (V) at and (III) at North Charleston. Standard deviation 0.3 on 7 of 9 observations. CSU Felt (VI) between Middleton Place and Summerville, SC. Magnitude 3.9. SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I NEIC 950417 134557.8 32.947 80.068 10.0F 7 29 20.7 0 13.6 3.9 6 USC 950417 134600.0 32.997 80.171 8.4 9 8 85 0.0 A 0.1 360 0.1 0.4 3.2 6 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) NEIC HBF 28.9 267 eP 13:46:03.41 ( 0.1 ) NEIC SGS 50.0 303 ePd :07.09 ( 0.2 ) NEIC LHS 183.5 338 eP :26.89 ( 0.0 ) NEIC JSC 184.6 324 eP :27.13 ( 0.1 ) NEIC PRM 248.0 301 eP :34.92 (-0.4 ) NEIC CEH 339.2 15 eP :47.18 ( 0.3 ) NEIC BLA 473.7 356 ePn :47:03.91 (-0.4 ) eLg 13:48:07.26 ( X) NEIC CVL 577.1 14 ePn :16.15 (-1.2X ) eS :11.34 ( X) NEIC PNJ 1028.6 29 Pn :48:09.70 (-4.4X ) USC SVS 7.8 246 iPd 13:46:02.36 ( 0.01 ) USC BCS 10.1 101 iPd :02.75 (-0.02 ) USC RGR 10.1 192 iPd :02.58 ( 0.00 ) USC MGS 11.3 165 iPd :02.85 ( 0.05 ) USC TWB 14.6 26 iPd :03.33 ( 0.01 ) USC HBF 16.0 250 iPd :03.45 ( 0.02 ) USC WAS 19.1 209 iPd :03.93 (-0.02 ) USC DRC 23.7 301 iPu :04.76 (-0.01 ) USC HWD 30.5 200 iPd :05.84 ( 0.01 ) USC SGS 38.3 305 iPu :07.18 ( 0.05X) USC COW 65.2 311 iPu :11.40 ( 0.13X) USC SRPW 133.3 280 eP+ :21.82 (-0.03X) USC SRPN 137.2 286 eP+ :22.36 (-0.10X) USC NPRS 139.9 282 eP+ :29.52 ( 6.73X) USC SRPD 144.9 277 eP+ :24.01 ( 0.61X) USC SRAV 145.3 285 eP+ :24.28 ( 0.83X) USC MTT 160.2 301 eP- :25.90 ( 0.46X) USC MR02 165.1 323 iPu :26.20 ( 0.26X) USC LHS 174.3 340 iPu :27.10 ( 0.09X) USC PRM 236.6 301 eP- :35.15 ( 0.49X) USC MMC 321.8 308 iPu :46.04 ( 0.94X) USC BC 346.5 310 iPu :49.89 ( 1.75X) Additional Data: CSU RGR P 13:45:55.9 WSRC SRPW P 13:46:21.82 WSRC SRPN P :22.21 S 13:46:39.04 WSRC SRPD P :24.01 WSRC SRAV P :24.28 S :41.16 GIT ATL P 13:46:54.2 S 13:47:33.5 ***** 1995 MAY 11; 19:33 - CHARLESTON, SOUTH CAROLINA ***** CSU Between Middleton Place and Summerville, SC. Magnitude 1.7. No felt reports. 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 950511 193348.9 32.943 80.133 7.0 6 5 132 0.1 B 0.8 360 0.8 1.7 1.0 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC MGS 5.0 189 iPd 19:33:50.73 ( 0.06 ) iPd 19:33:51.21 (-0.82X) USC RGR 6.9 236 iPd :50.83 (-0.02 ) iPd :51.71 (-0.64X) USC BCS 7.5 57 iPd :51.11 (-0.01 ) iPd :52.92 ( 0.10X) USC SVS 11.1 285 iPu :51.57 ( 0.05 ) iPd :52.62 (-0.90X) USC WAS 16.8 231 iPd :52.39 ( 0.04 ) iPd :54.34 (-0.64X) USC HBF 18.7 272 iPu :52.53 (-0.10 ) iPd :54.57 (-0.92X) Additional Data: CSU BCS P 19:33:50.8 CSU RGR P :51 CSU MGS P :51 CSU WAS P :52 ***** 1995 MAY 16; 22:26 - CHARLESTON, SOUTH CAROLINA ***** CSU Between Middleton Place and Summerville, SC. Magnitude 1.03. No felt reports. 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 950516 222642.9 32.962 80.143 3.0 4 7 153 0.2 C 0.2 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC MGS 7.1 179 iPu 22:26:44.45 (-0.15 ) iPu 22:26:44.76 (-1.13X) USC BCS 7.5 74 iPd :45.31 ( 0.49 ) iPd :46.46 ( 0.19X) USC RGR 7.7 219 iPd :44.72 ( 0.06 ) iPd :45.48 (-0.51X) USC TWB 17.4 12 iPd :46.23 (-0.21 ) iPd :48.09 (-1.03X) Additional Data: CSU MGS P 22:26:44.5 CSU RGR P :45 ***** 1995 MAY 28; 15:28 - TUSCALOOSA COUNTY, ALABAMA ***** NEIC Felt in Tuscaloosa County. Possible mine collapse. Standard deviation 0.4 on 7 of 13 observations. AUAL Called Alabama State Survey which did not consider this event to be a mine collapse, because there are no mines in the epicentral area. GIT Probable earthquake. Event does not appear to have the low frequency response seen with strata collapses and seems to have more shear wave energy than a typical 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 NEIC 950528 152837.0 33.191 87.827 1.0F 7 199 25.9 0 13.8 3.4 F SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) NEIC PWLA 199.0 354 iP 15:29:09.30 ( 0.0 ) eS 15:29:34.50 ( X) NEIC OXF 206.8 315 ePc :10.27 ( 0.0 ) iS :35.35 ( X) NEIC EBZ 258.0 327 eP :17.60 ( 0.7 ) eS :47.79 ( X) NEIC SFTN 313.6 321 eP :23.60 (-0.4 ) eS :30:00.80 ( X) NEIC MFTN 359.2 337 ePn :29.74 ( 0.0 ) NEIC GRT 371.4 337 ePn :31.00 (-0.3 ) NEIC GOGA 407.0 85 ePn :35.89 ( 0.0 ) ePg :42.93 ( ) NEIC PRM 516.0 77 ePn :47.98 (-1.9X ) eSg :31:01.75 ( X) ePg :59.68 ( ) NEIC MIAR 552.7 287 Pn? :53.43 (-1.1X ) NEIC FVM 581.6 337 ePn :55.76 (-2.4X ) ePg :30:11.49 ( ) NEIC JSC 620.5 77 ePn :29:58.39 (-4.8X ) ePg :30:17.67 ( ) NEIC LHS 665.0 76 ePn :05.13 (-3.6X ) eSn :15.72 ( X) eSg :44.44 ( X) NEIC CEH 855.1 67 ePn :23.21 (-9.6X ) eSn :53.44 ( X) eSg :32:37.14 ( X) Additional Data: GIT DALG P 15:29:25.4 GIT ATL P :29.0 S 15:30:08.1 ***** 1995 JUNE 5; 12:19 - CHARLESTON, 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 950605 121902.4 32.941 80.162 3.0 4 5 113 0.0 C 1.0 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC RGR 4.8 219 iPu 12:19:03.57 (-0.05 ) iPd 12:19:04.20 (-0.39X) USC MGS 5.2 158 iPd :03.77 ( 0.04 ) iPd :04.28 (-0.50X) USC BCS 10.0 64 iPd :04.67 (-0.02 ) iPd :06.78 ( 0.31X) USC WAS 14.7 225 iPu :06.65 ( 1.33X) iPd :07.43 (-0.14X) USC DRC 28.1 311 iPd :07.74 ( 0.01 ) ***** 1995 JUNE 20; 23:53 - CHARLESTON, SOUTH CAROLINA ***** CSU Between Middleton Place and Summerville, SC. Magnitude 1.6. No felt reports. 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 950620 235326.6 32.939 80.143 6.4 7 5 120 0.0 B 0.2 360 0.2 0.4 0.8 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC MGS 4.5 178 iPu 23:53:28.27 (-0.01 ) iPu 23:53:28.71 (-0.82X) USC RGR 5.9 235 iPd :28.38 (-0.01 ) iPu :29.16 (-0.57X) USC BCS 8.6 58 iPd :28.95 ( 0.01 ) iPd :30.83 ( 0.13X) USC SVS 10.4 289 iPd :29.12 ( 0.02 ) iPu :30.32 (-0.66X) USC WAS 15.8 230 iPd :29.91 ( 0.02 ) iPd :31.56 (-0.81X) USC HBF 17.8 273 iPd :30.21 ( 0.01 ) iPd :32.27 (-0.65X) USC TWB 19.9 11 iPu :30.65 (-0.02 ) iPu :33.08 (-0.67X) Additional Data: CSU RGR P 23:53:38 CSU MGS P :38 CSU WAS P :40 ***** 1995 JUNE 26; 00:36 - TROUTDALE, VIRGINIA ***** VTSO Felt in Troutdale, Virginia (V). Also felt in Grayson, Smyth, and Wythe Counties, Virginia, and Ash and Alleghany Counties, North Carolina. NEIC Felt (V) at Chilhowie, Independence, Mouth of Wilson, Sugar Grove and Trout Dale; (IV) at Atkins and (III) at Richlands, Virginia. Felt (IV) at Jefferson and West Jefferson, North Carolina. Also felt (III) at Lansing, North Carolina. Standard deviation 0.7 on 15 of 23 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 VTSO 950626 003617.1 36.752 81.481 1.8F 9 88 179 0.3 D D/D 3.5 -35 2.1 17.6 D 3.4 3.3 5 NEIC 950626 003617.1 36.747 81.452 5.0F 15 106 6.3 90 3.5 3.5 3.1B 5 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) VTSO PWV 75.2 31 eP? 00:36:31.46 ( 1.19X) eS? 00:36:40.77 ( 1.69X) VTSO NAV 87.5 44 eP :32.21 (-0.07 ) eS? :42.73 ( 0.06 ) VTSO BLA 107.3 61 eP :35.41 (-0.15 ) iS :48.50 ( 0.19 ) VTSO PKKY 227.2 323 eP :54.69 ( 0.73 ) VTSO TKL 239.3 240 iPd :55.58 (-0.24 ) eS :37:23.50 ( 0.69 ) VTSO ROKY 251.9 301 eP :57.07 (-0.65 ) VTSO FLKY 273.4 314 eP :59.70 (-0.76 ) VTSO CVL 300.3 62 eP :37:04.12 ( 0.35X) eS? :36.33 (-0.22X) VTSO BHKY 303.3 299 eP :03.40 (-0.72X) VTSO GHV 320.8 68 eP? :05.18 (-1.08X) SLG :45.32 ( 4.50X) VTSO NA12 347.4 66 eP? :10.91 ( 1.38X) eSL :52.59 ( 6.19X) VTSO PBV 353.1 85 eP? :07.12 (-3.08X) eS? :46.32 (-1.24X) NEIC BLA 105.6 60 eP 00:36:35.43 (-0.2 ) eS 00:36:48.47 ( X) NEIC CEH 232.4 113 eP :53.21 ( 0.1 ) eS :37:19.60 ( X) NEIC LHS 258.0 167 eP :55.84 (-0.7 ) NEIC JSC 274.7 176 eP :58.04 (-0.5 ) NEIC CVL 298.0 62 ePn :37:02.44 ( 0.8 ) eS :39.59 ( X) ePg :04.05 ( ) NEIC PRM 306.9 196 ePn :02.65 (-0.1 ) iPg :05.21 ( ) NEIC SGS 403.7 167 Pn? :15.79 ( 0.7 ) S :55.32 ( X) ePg :22.18 ( ) NEIC GOGA 413.7 207 ePn :16.43 ( 0.1 ) eSg :38:09.14 ( X) NEIC HBF 434.8 167 ePn :16.76 (-2.2X ) NEIC MVL 573.8 49 P :47.20 (10.4X ) S :56.90 ( X) Lg :39:06.90 ( X) NEIC BWD 616.0 55 iPd :38:00.00 (17.9X ) NEIC BVD 619.4 55 Pd :00.80 (18.1X ) NEIC DLA 678.3 359 P :37:51.30 ( 1.2 ) S :38:58.70 ( X) NEIC LDN 699.4 2 P :51.30 (-1.4 ) NEIC ELF 716.1 1 P :54.90 ( 0.0 ) S :39:04.80 ( X) NEIC TYNO 718.3 10 P :54.75 (-0.3 ) S :38:54.37 ( X) NEIC BINY 766.2 36 Pn? :38:07.17 ( 5.9X ) ePg :18.06 ( ) NEIC ACTO 771.7 8 P :01.67 (-0.2 ) S :39:15.13 ( X) NEIC PNJ 784.0 52 Pn :37:58.60 (-4.8X ) Sn :18.60 ( X) Pg :38:30.60 ( ) Sg :40:05.70 ( X) NEIC WLVO 838.4 17 P :10.19 ( 0.0 ) NEIC RSNY 1045.3 32 Pn? :34.92 (-1.2X ) eSg :41:08.58 ( X) NEIC LBNH 1158.7 41 Pn? :49.33 (-0.8X ) NEIC LTX 2225.1 255 P? :40:54.13 ( 0.5 ) Additional Data: GIT ATL P 00:37:21.2 S 00:38:06.9 Slg :21.1 ***** 1995 JULY 5; 14:16 - TELLICO PLAINS, TENNESSEE ***** NEIC Felt (IV) at Coker Creek, Englewood, Tellico Plains and Vonore; (III) at Ducktown, Madisonville and Tallassee; (II) at Athens and Maryville, Tennessee. Felt (IV) at Fontana Dam and Murphy; (III) at Andrews, North Carolina. Also felt at Robbinsville, 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 NEIC 950705 141644.5 35.366 84.212 10.0 24 51 3.7 4 VTSO 950705 141644.7 35.334 84.163 10.0 18 50 66 0.3 D C/D 2.7 -20 1.0 5.9 D 3.7 F USC 950705 141700.7 35.012 83.157 5.9 5 15 306 0.1 C 0.6 360 0.6 0.6 3.2 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) NEIC TKL 51.2 51 P 14:16:53.34 (-0.5 ) S 14:16:59.75 ( X) NEIC CDG 93.4 207 P :17:00.08 (-0.6 ) S :17:11.60 ( X) NEIC ATL 214.6 183 P :18.80 ( 1.1 ) NEIC PRM 221.3 130 eP :18.44 (-0.1 ) eS :43.84 ( X) NEIC GOGA 228.0 162 eP :19.35 ( 0.0 ) eS :45.33 ( X) NEIC ROKY 283.6 5 eP :24.02 (-2.5 ) NEIC SOKY 286.9 327 eP :26.94 ( 0.0 ) NEIC JSC 295.8 113 ePn :27.92 (-0.2 ) NEIC LHS 325.8 107 Pn? :30.86 (-1.1 ) NEIC FLKY 342.5 7 eP :31.36 (-2.6 ) NEIC PKKY 351.4 17 eP :35.06 (-0.1 ) NEIC PWLA 353.6 264 P :37.10 ( 1.6 ) NEIC SMKY 356.9 311 eP :37.55 ( 1.6 ) NEIC NAV 375.9 54 P :37.90 (-0.4 ) Sn :18:22.89 ( X) NEIC LLKY 390.3 297 eP :43.78 ( 3.7 ) NEIC BLA 397.0 58 P :40.70 (-0.4 ) S :23.20 ( X) NEIC SGS 417.0 124 Pn? :43.67 ( 0.0 ) NEIC HBF 444.8 126 Pn? :46.19 (-0.9 ) eS :44.00 ( X) NEIC GRT 481.5 283 P? :50.49 (-1.3 ) eS :59.09 ( X) NEIC OXF 483.7 260 eP :52.37 ( 0.2 ) NEIC CVL 590.5 59 eP :18:04.75 (-0.9 ) NEIC FVM 627.2 299 eP :08.22 (-2.1 ) NEIC BINY 1041.9 41 P? :59.98 (-2.5 ) eSg :21:30.89 ( X) NEIC RSNY 1311.0 36 P? :19:30.53 (-5.1 ) VTSO TKL 50.3 44 P 14:16:53.34 (-0.15 ) S 14:16:59.74 ( 0.21 ) VTSO CDG 92.5 210 P :17:00.08 (-0.22 ) S :17:11.60 ( 0.43 ) VTSO CCK 112.1 108 iPu :03.31 (-0.03 ) VTSO JVW 112.7 109 iPd :03.44 ( 0.03 ) VTSO SMT 117.5 112 iPd :04.19 ( 0.06 ) VTSO BG3 118.4 108 iPd :04.26 ( 0.00 ) VTSO MMC 129.4 118 iPu :06.22 ( 0.28 ) VTSO ATL 211.5 184 P :18.80 ( 0.29 ) VTSO PRM 215.5 130 P :18.40 (-0.73 ) VTSO GOGA 222.7 163 P :19.30 (-0.92 ) VTSO ROKY 286.5 4 eP :24.02 (-4.64X) VTSO JSC 290.1 113 P :30.08 ( 0.97 ) VTSO SOKY 292.0 327 eP :26.94 (-2.42X) VTSO FLKY 345.1 6 eP :31.36 (-4.46X) VTSO PKKY 353.0 16 eP :35.06 (-1.77 ) VTSO PWLA 357.6 265 P :37.10 (-0.28 ) S :12.60 (-1.90 ) VTSO SMKY 363.0 311 eP :37.55 (-0.48 ) VTSO NAV 374.0 53 P :37.90 (-1.53 ) VTSO LLKY 395.5 298 eP :43.78 ( 1.77X) VTSO SGS 411.8 124 P :43.60 (-0.38X) VTSO HBF 441.4 126 P :46.00 (-1.59X) VTSO GRT 486.2 284 P :50.40 (-2.69X) VTSO OXF 487.9 261 P :52.30 (-0.99X) VTSO CVL 588.3 58 P :18:04.70 (-0.87X) USC JVW 14.7 99 iPd 14:17:03.44 ( 0.09 ) USC CCK 15.2 86 iPu :03.31 (-0.10 ) USC SMT 19.3 118 iPd :04.19 ( 0.15 ) USC BG3 20.7 96 iPd :04.26 (-0.01 ) USC MMC 34.0 139 iPu :06.22 (-0.15 ) Additional Data: GIT CDG P 14:17:00.7 S 14:17:11.6 GIT ATL P :18.6 S :42.1 ***** 1995 JULY 7; 21:01 - MOUNTAIN CITY, TENNESSEE ***** NEIC Felt (III) at West Jefferson, North Carolina. Felt in Ashe and Watauga Counties, North Carolina. Also felt at Bloomery, Laurel and Mountain City, Tennessee. VTSO Felt (IV) in Mountain City, Tennessee. Also felt in Cherokee, Tennessee, and Ashe County, 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 NEIC 950707 210102.9 36.515 81.873 11.6 11 117 3.0 3 VTSO 950707 210103.0 36.493 81.833 10.0 13 117 92 0.4 D C/D 2.2 -53 1.1 4.7 C 3.1 4 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) NEIC PWV 116.8 39 P 21:01:22.50 (-0.1 ) S 21:01:35.50 ( X) NEIC NAV 131.2 47 P :24.12 (-0.6 ) eS :39.27 ( X) NEIC BLA 151.2 59 P :26.91 (-0.8 ) S :44.26 ( X) NEIC TKL 195.7 242 P :34.06 ( 0.6 ) NEIC LHS 245.7 157 eP :41.70 ( 1.8 ) eS :02:10.95 ( X) NEIC JSC 254.6 167 eP :42.32 ( 1.3 ) eS :12.24 ( X) NEIC PRM 273.5 190 eP :47.54 ( 4.1 ) eS :18.81 ( X) NEIC CVL 343.6 61 ePn :53.38 ( 1.0 ) eS :32.57 ( X) NEIC GOGA 373.6 203 Pn? :02:02.42 ( 6.1 ) NEIC SGS 389.2 161 ePn :01:58.56 ( 0.4 ) VTSO PWV 116.7 37 P 21:01:22.45 ( 0.14 ) S 21:01:35.81 ( 0.01 ) VTSO NAV 130.1 45 P :24.12 (-0.23 ) eS :39.27 ( 0.00 ) VTSO BLA 149.2 57 P :26.91 (-0.35 ) S :44.26 ( 0.04 ) VTSO TKL 197.8 243 P :34.06 (-0.63 ) iS :02:01.89 ( 5.04X) VTSO PKKY 235.2 334 eP :41.25 ( 0.84 ) VTSO LHS 242.3 157 eP :42.43 ( 0.95 ) eS :10.93 ( 2.52X) VTSO ROKY 243.4 311 eP :42.98 ( 1.35X) VTSO JSC 250.7 168 iP :42.16 (-0.40 ) eS :10.80 ( 0.40 ) VTSO FLKY 273.6 322 eP :45.67 ( 0.33 ) VTSO CVL 341.8 60 eP :55.14 ( 1.43X) eS :33.69 ( 4.23X) VTSO GHV 361.2 65 eP :56.93 ( 0.87 ) eS? :39.02 ( 5.53X) ***** 1995 JULY 15; 01:03 - ALABAMA ***** NEIC Possible mine collapse. Standard deviation 0.8 on 7 of 11 observations. AUAL Called Alabama State Survey which did not consider this event to be a mine collapse, because there are no mines in the epicentral 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 950715 010328.4 33.478 87.665 1.0F 7 198 19.1 0 7.8 3.3 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) NEIC OXF 197.9 306 ePc 01:04:00.37 (-0.1 ) eS 01:04:25.25 ( X) NEIC GRT 348.1 333 ePn :20.35 ( 0.6 ) NEIC GOGA 390.3 90 ePn :26.16 ( 1.0 ) eSn :05:13.52 ( X) ePg :33.07 ( ) eSg :19.88 ( X) NEIC PRM 495.9 81 ePn :38.71 ( 0.1 ) eSg :49.83 ( X) ePg :49.64 ( ) NEIC MIAR 558.2 284 ePn :46.53 (-0.2 ) NEIC FVM 559.3 334 ePn :46.43 (-0.3 ) ePg :05:01.12 ( ) NEIC JSC 599.4 80 ePn :04:50.76 (-1.1 ) eSg :06:16.52 ( X) ePg :05:07.61 ( ) NEIC LHS 642.7 78 ePn :04:54.10 (-3.3X ) eSn :05.32 ( X) ePg :05:14.77 ( ) eSg :30.76 ( X) NEIC CEH 829.5 69 Pn? :18.68 (-2.3X ) eSn :44.49 ( X) eSg :07:23.68 ( X) NEIC ULM 1981.6 343 P :07:39.90 ( 0.8X ) NEIC PDAR 2170.6 305 P :57.80 (-2.4X ) Additional Data: GIT ATL P 01:04:16.3 Sn 01:04:45.1 Slg :57.8 GIT CDG P :20.5 ***** 1995 JULY 21; 00:50 - MIDDLETON PLACE, SOUTH CAROLINA ***** CSU Between Middleton Place and Summerville, SC. Magnitude 2.1 No felt reports. SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I CSU 950721 005007. 32.985 80.164 6.5 2.1 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) CSU RGR P 00:50:07 CUS MGS P :07 ***** 1995 JULY 23; 02:21 - CHARLESTON, SOUTH CAROLINA ***** CSU Between Middleton Place and Summerville, SC. Magnitude <1. No felt reports. 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 950723 022155.7 32.815 80.203 9.4 5 10 285 0.0 C 1.8 360 1.8 1.3 0.4 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC RGR 10.3 4 iPd 02:21:58.40 ( 0.03 ) USC MGS 10.8 32 iPd :58.45 (-0.04 ) USC SVS 17.5 346 iPu :59.48 (-0.01 ) USC HBF 19.1 320 iPd :59.64 ( 0.00 ) USC BCS 22.3 35 iPd :22:00.40 ( 0.02 ) Additional Data: CSU RGR P 02:21:58 CSU BCS P :59 ***** 1995 JULY 29; 14:51 - CHARLESTON, 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 950729 145122.8 33.001 80.156 0.4 6 9 84 0.0 C 0.2 360 0.2 47.2 1.2 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC BCS 8.7 105 iPu 14:51:25.05 (-0.02 ) iPd 14:51:26.03 (-0.74X) USC SVS 9.4 248 iPu :25.00 (-0.06 ) USC RGR 10.9 199 iPd :25.27 (-0.01 ) iPd :26.53 (-0.60X) USC MGS 11.5 173 iPu :25.45 ( 0.03 ) USC TWB 13.6 21 iPd :25.87 ( 0.02 ) USC DRC 24.8 299 iPu :27.87 ( 0.04 ) iPd :31.67 ( 0.04X) ***** 1995 AUGUST 3; 13:07 - YORK RIVER STATE PARK, VIRGINIA ***** VTSO Felt (IV) in York River State Park and Camp Peary Naval Reservation, Virginia. Also felt in James City, King and Queen, Gloucester, and York Counties, 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 NEIC 950803 130704.4 37.401 76.683 5.0 10 167 2.9 2.4 VTSO 950803 130705.6 37.393 76.693 1.0 12 87 290 0.3 D C/D 1.7 -88 0. 2.1 B 2.6 4 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) NEIC CVL 166.8 293 eP 13:07:32.23 (-0.1 ) eS 13:07:52.85 ( X) NEIC CEH 278.0 233 eP :45.82 ( 0.1 ) eS :08:16.76 ( X) NEIC GPD 444.8 25 P :08:06.28 (-1.4 ) NEIC TBR 467.0 26 P :11.54 ( 1.1 ) NEIC LHS 489.3 230 P :12.82 (-1.1 ) NEIC JSC 533.8 231 P :20.90 ( 1.1 ) NEIC BINY 533.8 6 P :41.66 (22.3 ) NEIC PRM 633.8 236 P :30.38 (-1.2 ) NEIC RSNY 811.8 12 P :09:20.03 (25.5 ) NEIC LBNH 856.2 26 eS 13:10:44.51 (104. ) VTSO PBV 87.2 239 eP 13:07:19.89 (-0.05 ) eS 13:07:30.61 ( 0.21 ) VTSO CBN 108.2 327 iP :25.50 ( 2.11X) iS :36.70 ( 0.34 ) VTSO NA12 123.5 303 eP :25.89 (-0.02 ) eS :40.85 ( 0.13 ) VTSO GHV 132.6 290 eP :27.31 (-0.08 ) eS :42.99 (-0.29 ) VTSO CVL 169.0 293 eP :32.74 (-0.56 ) eS :53.36 ( 0.00 ) VTSO CEH 271.7 233 Pn :46.50 ( 0.55 ) Sn :08:15.50 ( 0.21 ) VTSO MVL 290.9 6 P :50.80 ( 2.52X) S? :19.50 ( 0.18 ) VTSO BLA 331.0 268 eP? :52.60 (-0.66X) ***** 1995 AUGUST 18; 20:11 - CHARLESTON, 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 950818 201123.2 32.932 80.143 3.6 6 4 124 0.1 B 1.3 360 1.3 3.0 0.2 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC MGS 3.8 178 iPu 20:11:24.24 (-0.18 ) USC RGR 5.5 241 iPd :24.71 ( 0.08 ) USC BCS 9.0 54 iPd :25.49 ( 0.11 ) USC SVS 10.7 292 iPd :25.37 (-0.18 ) USC WAS 15.3 232 iPd :26.29 ( 0.00 ) USC DRC 30.1 310 iPd :28.93 ( 0.00 ) ***** 1995 AUGUST 19; 03:59 - CHARLESTON, 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 950819 035908.8 32.979 80.188 7.3 4 8 142 0.1 C 0.0 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC SVS 5.7 259 iPu 03:59:12.60 ( 1.92X) USC RGR 7.9 184 iPd :11.02 ( 0.13 ) USC MGS 10.0 154 iPd :11.17 (-0.06 ) USC BCS 11.5 89 iPd :11.61 ( 0.02 ) USC DRC 23.5 307 iPd :13.30 (-0.13 ) ***** 1995 SEPTEMBER 16; 12:48 - CHARLESTON, 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 950916 124805.6 32.972 80.154 4.1 7 8 140 0.1 C 0.6 360 0.6 2.9 1.2 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC RGR 8.1 207 iPu 12:48:07.56 ( 0.09 ) USC BCS 8.3 84 iPd :07.66 (-0.04 ) USC MGS 8.4 171 iPd :07.58 ( 0.02 ) USC SVS 8.8 267 iPu :07.60 (-0.05 ) USC HBF 16.9 261 iPd :08.81 (-0.12 ) USC WAS 17.7 218 iPd :09.07 (-0.03 ) USC DRC 26.5 304 iPd :10.76 ( 0.07 ) ***** 1995 SEPTEMBER 16; 12:53 - CHARLESTON, SOUTH CAROLINA ***** CSU Felt (III) between Middleton Place and Summerville, SC. Magnitude 2.6. 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 950916 125350.7 32.979 80.157 3.9 9 9 81 0.1 B 0.3 360 0.3 1.7 2.3 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC SVS 8.6 262 iPd 12:53:52.71 ( 0.01 ) USC BCS 8.6 90 iPd :52.80 (-0.03 ) USC RGR 8.7 203 iPd :52.70 ( 0.05 ) USC MGS 9.2 170 iPd :52.84 ( 0.06 ) USC TWB 15.8 19 iPd :53.98 ( 0.02 ) USC HBF 16.8 258 iPd :53.91 (-0.09 ) USC WAS 18.2 216 iPd :54.20 (-0.08 ) USC DRC 25.8 303 iPd :55.76 ( 0.08 ) USC HWD 29.2 204 iPd :56.26 ( 0.07 ) Additional Data: CSU BCS P 12:52.5 CSU RGR P :52:8 CSU MGS P :53 CSU TWB P :54 ***** 1995 OCTOBER 17; 02:12 - WILMINGTON, DELAWARE ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I DGS 951017 021228.6 39.755 75.573 16.7 6 5 0.1 2.0 F SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) DGS BWD 5.0 356 iPd 02:12:30.0 S 02:12:30.9 DGS BVD 6.7 71 iPu :29.7 S :30.5 DGS NED 12.6 244 iPd :30.9 S :32.7 ***** 1995 OCTOBER 17; 08:51 - WILMINGTON, DELAWARE ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I DGS 951017 085143.2 39.756 75.544 17.4 6 4 0.1 2.0 F SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) DGS BVD 4.3 61 iPu 08:51:44.3 iS 08:51:45.0 DGS BWD 5.6 330 iPd :44.5 iS :45.3 DGS NED 14.9 247 iP :45.8 iS? :48.0 ***** 1995 NOVEMBER 15; 10:29 - RALEIGH COUNTY, WEST VIRGINIA ***** VTSO Location is unreliable. 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 951115 102924.8 37.717 81.043 32.8 8 50 288 0.3 D D/D 31.3 26 4.4 27.7 D 2.6 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) VTSO NAV 49.7 154 iPd 10:29:34.60 ( 0.16 ) iS 10:29:40.70 (-0.41 ) VTSO BLA 78.6 135 iPc :38.45 (-0.05 ) S :48.38 ( 0.39 ) VTSO CVL 229.2 82 eP? :59.10 (-0.48 ) eS :30:23.40 (-0.63 ) VTSO GHV 258.9 87 P :30:03.80 ( 0.60 ) eS :32.50 ( 2.28X) VTSO NA12 280.3 83 eP? :06.50 ( 0.68 ) eS :38.00 ( 3.30X) VTSO TKL 334.2 228 eP? :14.00 ( 1.55X) ***** 1995 DECEMBER 15; 10:16 - JEFFERSON COUNTY, TENNESSEE ***** NEIC Felt in eastern Knox, southwestern Jefferson and northern Sevier Counties. 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 951215 101639.9 36.193 83.694 10.0 13 130 216 0.6 D D/D 3.2 -53 0.9 3.8 C 2.8 2.9 F NEIC 951215 101640.3 36.071 83.640 5.0F 5 122 20.8 90 19.8 2.6 2.9 F SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) VTSO MYNC 130.3 198 P 10:17:00.80 (-0.44 ) VTSO CDG 196.5 207 P :11.20 (-0.17 ) S 10:17:34.30 ( 0.91 ) VTSO NAV 287.4 63 Pn :23.83 (-0.15 ) eSn :56.00 ( 0.96 ) VTSO JSC 306.6 133 eP :24.90 (-1.37 ) Sg? :18:00.21 ( 1.24 ) VTSO GOGA 309.3 176 P :24.40 (-2.20X) VTSO ATL 311.8 191 P :27.40 ( 0.48 ) S :02.60 ( 2.53X) VTSO BLA 313.6 68 Pn :26.99 (-0.20 ) Sn :01.79 ( 1.27 ) VTSO LHS 324.3 125 ePn :27.97 (-0.47 ) Sn? :02.16 (-0.51 ) VTSO CEH 415.9 93 P :38.10 (-1.54 ) NEIC MYNC 122.3 202 iPc 10:17:00.80 (-0.1 ) NEIC GOGA 300.2 177 ePn :24.45 ( 0.0 ) NEIC JSC 289.1 132 ePn :24.97 ( 0.6 ) NEIC BLA 311.4 65 ePn :27.56 ( 0.5 ) NEIC LHS 311.4 124 P :28.02 ( 1.4X ) NEIC CEH 411.4 91 P :38.17 (-1.0 ) NEIC CVL 511.5 64 Pn :55.48 ( 4.0X ) NEIC FVM 645.0 291 eS 10:19:36.70 ( X) Additional Data: GIT CDG P 10:17:11.2 S 10:17:34.3 GIT ATL P :27.4 S :18:02.6 ***** 1995 DECEMBER 20; 16:32 - WILMINGTON, DELAWARE ***** SRCE DATE HRMN SEC LAT-N LON-W DEPTH PH DMN GAP RMS Q SQD ERH1 AZ ERH2 ERZ Q MN MD MAGT I DGS 951220 163202.7 39.753 75.553 4.1 6 5 0.1 1.4 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) DGS BVD 5.2 62 ePd 16:32:03.8 S 16:32:04.8 DGS BWD 5.5 339 Pd :04.0 S :04.8 DGS NED 14.1 247 ePd :05.4 S :07.2 ***** 1995 DECEMBER 28; 23:48 - FAYETTE COUNTY, WEST VIRGINIA ***** VTSO Probable earthquake. 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 951228 234830.4 38.084 80.968 13.1 6 87 287 0.1 D D/D 5.0 -72 2.5 7.9 D 2.5 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) VTSO NAV 86.7 170 iP- 23:48:44.80 (-0.15 ) eS 23:48:55.17 ( 0.12 ) VTSO BLA 108.3 153 iPd :48.42 ( 0.17 ) S :49:00.53 (-0.14 ) VTSO GHV 253.5 96 eP :49:10.01 ( 0.01 ) eS? :40.26 ( 2.43X) VTSO TKL 367.5 224 eP? :22.55 (-1.42X) eS? :50:01.56 (-0.15 ) SOUTHEASTERN U. S. RESERVOIR RELATED EARTHQUAKES DURING 1995 Events are listed chronologically (this also applies to multiple hypocenter locations for the same event). All times are Universal Coordinated Time. Most entries in the listing are self-explanatory. Items that might require further explanation are defined in the section entitled DEFINITIONS AND NETWORK OPERATOR CODES. ***** 1995 JANUARY 30; 21:11 - JOCASSEE 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 950130 211128.5 34.950 82.917 2.9 8 5 318 0.1 C 0.8 360 0.8 1.3 1.3 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC BG3 5.0 345 iPd 21:11:29.42 (-0.04 ) iSd 21:11:30.27 ( 0.04 ) USC JVW 8.7 303 iPd :30.00 (-0.03 ) iSd :31.26 ( 0.02 ) USC CCK 10.6 320 iPu :30.39 ( 0.07 ) iSd :31.68 (-0.08 ) USC BC 12.9 306 iPd :30.71 ( 0.02 ) iSu :32.40 ( 0.00 ) ***** 1995 FEBRUARY 23; 23:03 - JOCASSEE 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 950223 230316.4 34.967 82.944 0.5 8 3 279 0.1 C 0.5 360 0.5 0.6 1.1 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC BG3 3.1 21 iPu 23:03:16.86 (-0.09 ) iSu 23:03:17.46 ( 0.06 ) USC JVW 5.7 299 iPd :17.39 (-0.01 ) iSu :18.16 (-0.05 ) USC CCK 7.6 325 iPd :17.81 ( 0.08 ) iSu :18.74 (-0.05 ) USC BC 9.8 305 iPu :18.14 ( 0.03 ) iSu :19.48 ( 0.02 ) ***** 1995 FEBRUARY 24; 17:53 - KEOWEE 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 950224 175306.7 34.749 83.067 3.0 9 14 290 0.1 D 2.9 360 2.9 19.6 1.5 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC MMC 14.3 76 iPu 17:53:09.09 (-0.07 ) iSd 17:53:11.09 ( 0.04 ) USC SMT 22.0 23 iPd :10.46 ( 0.06 ) iSu :13.21 (-0.04 ) USC JVW 27.7 13 iPd :11.33 ( 0.01 ) iSu :14.73 (-0.16X) USC BC 30.0 6 iPu :11.74 ( 0.06 ) iSd :15.51 (-0.03 ) USC CCK 31.1 13 iPu :11.77 (-0.10 ) iSd :15.96 ( 0.09 ) ***** 1995 MARCH 16; 18:04 - JOCASSEE 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 950316 180404.7 35.003 82.968 3.4 7 3 152 0.0 B 0.4 360 0.4 0.5 1.7 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC JVW 3.0 247 iPd 18:04:05.39 (-0.04X) iSd 18:04:06.06 ( 0.04 ) USC CCK 3.1 316 iPu :05.50 ( 0.06 ) iSd :06.07 ( 0.02 ) USC BG3 3.4 108 iPu :05.51 ( 0.03 ) iSu :06.07 (-0.05 ) USC BC 6.1 286 iPd :05.78 (-0.05 ) iSd :06.70 (-0.04 ) ***** 1995 MARCH 30; 18:05 - KEOWEE 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 950330 180558.6 34.756 83.071 3.0 11 15 288 0.1 D 1.6 360 1.6 11.0 1.7 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC MMC 14.5 79 iPu 18:06:00.92 (-0.14 ) iSd 18:06:03.07 ( 0.09 ) USC SMT 21.5 25 iPu :02.10 (-0.07 ) iSd :04.96 (-0.01 ) USC JVW 27.1 14 iPu :03.19 ( 0.11 ) iSu :07.28 ( 0.70X) USC BG3 29.2 26 iPd :03.51 ( 0.09 ) iSd :07.10 (-0.09 ) USC BC 29.3 7 iPu :03.49 ( 0.06 ) iSu :07.13 (-0.07 ) USC CCK 30.5 14 iPd :03.61 (-0.02 ) iSd :07.60 ( 0.05 ) ***** 1995 APRIL 3; 22:00 - HARTWELL 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 950403 220045.8 34.727 82.835 2.9 10 9 325 0.0 C 1.0 360 1.0 2.7 1.2 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC MMC 9.4 309 iPu 22:00:47.48 (-0.02 ) iSd 22:00:48.77 (-0.02 ) USC SMT 25.8 331 iPd :50.10 (-0.02 ) iSu :53.49 ( 0.03 ) USC BG3 30.8 343 iPd :50.89 (-0.03 ) iSu :54.90 ( 0.01 ) USC JVW 33.0 333 iPd :51.40 ( 0.13 ) iSu :55.50 (-0.02 ) USC CCK 35.8 336 iPu :51.73 ( 0.00 ) iSu :56.30 (-0.02 ) ***** 1995 APRIL 4; 17:48 - KEOWEE 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 950404 174830.1 34.762 83.061 4.9 10 14 284 0.0 C 1.3 360 1.3 3.9 1.6 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC MMC 13.5 82 iPu 17:48:32.37 (-0.06 ) iSu 17:48:34.32 ( 0.03 ) USC SMT 20.5 24 iPu :33.51 (-0.01 ) iSu :36.18 (-0.04 ) USC JVW 26.2 13 iPu :34.25 (-0.18X) iSu :37.86 ( 0.02 ) USC BG3 28.2 25 iPu :34.86 ( 0.11 ) iSu :38.00 (-0.42X) USC BC 28.5 6 iPu :34.79 ( 0.00 ) iSu :38.51 ( 0.02 ) USC CCK 29.6 12 IPu :34.95 (-0.02 ) iSu :38.79 (-0.02 ) ***** 1995 APRIL 5; 08:48 - JOCASSEE 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 950405 084817.4 34.952 82.965 1.3 12 2 133 0.0 B 0.2 360 0.2 0.8 2.3 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC SMT 2.4 194 iPu 08:48:17.97 ( 0.05 ) iSd 08:48:18.28 (-0.02 ) USC JVW 5.4 327 iPd :18.41 ( 0.00 ) iSu :19.14 (-0.03 ) USC BG3 5.5 33 iPu :18.44 ( 0.02 ) iSd :19.14 (-0.06 ) USC CCK 8.3 343 iPd :18.91 ( 0.04 ) iSu :19.97 (-0.02 ) USC BC 9.5 320 iPd :19.12 ( 0.05 ) iSu :20.29 (-0.06 ) USC MMC 19.6 167 iPu :20.76 ( 0.07 ) iSd :23.19 (-0.05 ) ***** 1995 APRIL 5; 08:54 - JOCASSEE 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 950405 085420.4 34.949 82.958 1.4 10 2 142 0.0 B 0.2 360 0.2 0.6 1.5 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC SMT 2.4 211 iPu 08:54:20.87 ( 0.01 ) iSu 08:54:21.24 (-0.01 ) USC BG3 5.4 26 ePu :21.34 ( 0.00 ) iSu :22.08 (-0.02 ) USC JVW 6.0 323 iPd :21.39 (-0.05 ) iSu :22.06 (-0.22X) USC CCK 8.7 339 iPd :21.92 ( 0.05 ) iSu :22.97 (-0.08 ) USC BC 10.1 319 iPd :22.12 ( 0.02 ) iSu :23.52 ( 0.06 ) USC MMC 19.2 168 iPd :24.21 ( 0.65X) iSd :26.07 ( 0.02 ) ***** 1995 APRIL 15; 06:57 - HARTWELL 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 950415 065725.5 34.616 82.880 8.7 11 18 349 0.2 D 5.1 360 5.1 2.9 2.3 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC MMC 18.4 350 iPu 06:57:28.73 (-0.13 ) iSd 06:57:31.74 ( 0.28 ) USC SMT 35.9 347 iPu :31.52 (-0.02 ) iSd :36.43 ( 0.19 ) USC BG3 42.0 354 iPu :32.39 (-0.13 ) iSd :37.81 (-0.17 ) USC JVW 43.1 346 iPu :32.69 ( 0.01 ) iSu :38.47 ( 0.20 ) USC CCK 46.2 347 iPd :33.19 ( 0.01 ) USC BC 46.6 343 iPu :33.26 ( 0.02 ) iSu :38.71 (-0.56 ) ***** 1995 APRIL 15; 07:46 - HARTWELL 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 950415 074626.2 34.615 82.858 8.6 10 19 352 0.1 D 3.1 360 3.1 1.6 1.4 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC MMC 19.0 344 iPd 07:46:29.58 ( 0.02 ) iSd 07:46:32.40 ( 0.17 ) USC SMT 36.5 343 iPu :32.21 (-0.06 ) iSd :37.11 ( 0.07 ) USC BG3 42.4 351 iPd :33.08 (-0.13 ) iSd :38.63 (-0.08 ) USC JVW 43.7 343 iPu :33.50 ( 0.09 ) iSd :38.89 (-0.19 ) USC CCK 46.8 345 iPu :33.88 (-0.03 ) iSu :40.05 ( 0.09 ) ***** 1995 APRIL 18; 04:58 - 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 950418 045822.9 34.356 81.330 2.0 9 2 180 0.0 C 0.4 360 0.4 0.5 1.9 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC MR07 1.7 17 iPd 04:58:23.42 ( 0.02 ) USC MR10 2.3 197 iPu :23.35 (-0.12 ) iSu 04:58:23.86 (-0.01 ) USC MR01 4.2 130 iPd :23.72 ( 0.03 ) iSd :24.04 (-0.23X) USC MR05 9.8 182 iPu :24.61 ( 0.02 ) iSd :25.84 (-0.01 ) USC JSC 10.6 142 iPd :24.72 (-0.04 ) iSd :26.05 (-0.09 ) USC MR02 20.3 153 iPd :26.33 ( 0.01 ) ***** 1995 APRIL 18; 14:36 - 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 950418 143646.6 34.355 81.326 1.5 12 2 157 0.1 B 0.4 360 0.4 0.7 2.5 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC MR07 1.7 4 iPd 14:36:47.03 ( 0.04 ) iSd 14:36:47.25 (-0.04 ) USC MR10 2.3 206 iPu :46.97 (-0.10 ) iSu :47.52 ( 0.09 ) USC MR01 3.8 133 iPd :47.33 ( 0.07 ) iSd :47.70 (-0.07 ) USC MR05 9.8 184 iPd :48.23 ( 0.01 ) iSd :49.47 ( 0.02 ) USC JSC 10.3 144 iPd :48.34 (-0.01 ) iSd :49.66 (-0.02 ) USC MR02 20.0 154 iPd :49.96 ( 0.04 ) iSd :52.56 ( 0.11 ) ***** 1995 APRIL 18; 18:26 - 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 950418 182633.5 34.356 81.330 2.7 12 2 178 0.1 B 0.4 360 0.4 0.4 1.2 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC MR07 1.7 16 iPd 18:26:34.06 ( 0.03 ) iSu 18:26:34.45 ( 0.01 ) USC MR10 2.3 198 iPu :33.99 (-0.10 ) iSu :34.60 ( 0.05 ) USC MR01 4.2 131 iPd :34.35 ( 0.06 ) iSd :34.93 ( 0.03 ) USC MR05 9.8 182 iPd :35.27 ( 0.10 ) iSd :36.47 ( 0.03 ) USC JSC 10.6 143 iPd :35.35 ( 0.02 ) iSu :36.66 (-0.07 ) USC MR02 20.3 153 iPd :36.96 ( 0.08 ) iSu :39.39 (-0.06 ) ***** 1995 APRIL 18; 19:44 - 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 950418 194430.7 34.351 81.337 1.3 8 2 203 0.0 C 0.3 360 0.3 0.4 1.2 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC MR10 1.7 183 iPu 19:44:31.09 ( 0.03 ) iSu 19:44:31.29 (-0.06 ) USC MR07 2.4 26 iPd :31.18 ( 0.02 ) iSd :31.50 (-0.02 ) USC MR01 4.3 120 iPd :31.47 ( 0.05 ) iSd :32.03 ( 0.04 ) USC JSC 10.6 138 iPd :32.46 (-0.02 ) iSd :33.79 (-0.05 ) ***** 1995 APRIL 19; 00:53 - 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 950419 005315.8 34.351 81.332 0.7 9 2 180 0.0 B 0.5 360 0.5 0.8 1.4 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC MR10 1.7 197 iPu 00:53:16.19 ( 0.03 ) iSu 00:53:16.38 (-0.04 ) USC MR07 2.3 17 iPd :16.28 ( 0.02 ) iSd :16.54 (-0.05 ) USC MR01 4.0 122 iPd :16.56 ( 0.06 ) iSu :17.19 ( 0.18X) USC JSC 10.3 140 iPd :17.56 (-0.01 ) iSd :18.89 (-0.02 ) USC MR02 19.9 152 iPu :19.21 ( 0.09 ) iSd :21.60 (-0.03 ) ***** 1995 APRIL 23; 01:54 - 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 950423 015452.4 34.338 81.361 3.6 6 2 278 0.1 C 1.4 360 1.4 1.0 1.0 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC MR10 2.2 95 iPu 01:54:52.96 (-0.10 ) iSu 01:54:53.67 ( 0.08 ) USC MR07 4.9 43 iPu :53.31 (-0.05 ) iSu :54.16 ( 0.04 ) USC JSC 11.3 125 iPu :54.43 ( 0.11 ) iSd :55.77 (-0.06 ) ***** 1995 APRIL 23; 02:30 - 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 950423 023042.3 34.349 81.345 3.0 12 2 223 0.1 C 0.7 360 0.7 0.6 1.0 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC MR10 1.5 153 iPu 02:30:42.72 (-0.19 ) iSu 02:30:43.40 ( 0.06 ) USC MR07 3.0 37 iPu :43.09 ( 0.03 ) iSd :43.54 (-0.06 ) USC MR01 4.9 112 iPd :43.29 ( 0.03 ) iSd :44.24 ( 0.27 ) USC MR05 9.0 174 iPu :43.96 ( 0.06 ) iSd :45.10 ( 0.01 ) USC JSC 10.9 134 iPd :44.22 (-0.01 ) iSu :45.57 (-0.10 ) USC MR02 20.2 149 iPu :45.84 ( 0.12 ) iSu :48.34 ( 0.05 ) ***** 1995 APRIL 23; 19:51 - 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 950423 195104.1 34.351 81.333 1.7 6 2 186 0.0 C 0.2 360 0.2 0.2 1.1 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC MR10 1.7 193 iPu 19:51:04.48 (-0.02 ) iSu 19:51:04.83 ( 0.01 ) USC MR07 2.3 20 iPd :04.58 ( 0.02 ) iSd :04.92 (-0.02 ) USC JSC 10.4 140 iPd :05.85 ( 0.01 ) iSd :07.18 (-0.01 ) ***** 1995 MAY 5; 17:09 - KEOWEE 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 950505 170907.4 34.746 83.065 5.4 9 14 298 0.1 C 1.6 360 1.6 4.8 1.6 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC MMC 14.2 75 iPd 17:09:09.84 (-0.04 ) iSd 17:09:11.94 ( 0.11 ) USC SMT 22.2 23 iPd :11.13 ( 0.00 ) iSu :13.99 (-0.08 ) USC JVW 28.0 13 iPd :12.13 ( 0.08 ) iSd :16.14 ( 0.44X) USC BG3 30.0 24 iPu :12.28 (-0.08 ) iSu :16.26 ( 0.00 ) USC CCK 31.4 12 iPd :12.60 ( 0.01 ) iSu :16.72 ( 0.05 ) ***** 1995 JUNE 9; 18:37 - 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 950609 183741.5 34.417 81.413 1.0 8 10 340 0.1 D 1.1 360 1.1 83.4 1.0 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC MR07 9.6 122 iPu 18:37:43.02 (-0.05 ) iSu 18:37:44.22 (-0.06 ) USC MR10 11.3 142 iPd :43.36 ( 0.02 ) iSd :44.70 (-0.06 ) USC MR01 14.3 131 iPd :43.91 ( 0.12 ) iSd :45.64 ( 0.09 ) USC JSC 20.7 137 iPu :44.84 (-0.04 ) iSd :47.50 ( 0.04 ) ***** 1995 JUNE 19; 15:33 - 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 950619 153353.3 34.418 81.417 3.9 10 10 337 0.1 C 1.5 360 1.5 2.1 1.2 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC MR07 10.0 122 iPu 15:33:55.05 (-0.03 ) iSu 15:33:56.40 (-0.01 ) USC MR10 11.7 141 iPu :55.31 (-0.02 ) iSu :56.85 ( 0.00 ) USC MR01 14.7 131 iPu :55.85 ( 0.08 ) iSu :57.65 ( 0.03 ) USC JSC 21.1 137 iPu :56.78 (-0.05 ) iSd :59.54 ( 0.05 ) USC MR02 30.4 145 iPd :58.41 ( 0.10 ) iSd :34:01.93 (-0.17 ) ***** 1995 JULY 24; 15:21 - KEOWEE 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 950724 152135.5 34.821 82.888 6.0 7 5 220 0.1 C 1.9 360 1.9 1.5 1.6 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC MMC 5.2 208 iPu 15:21:36.74 (-0.04 ) iSu 15:21:37.83 ( 0.03 ) USC BG3 19.5 348 iPu :38.82 ( 0.00 ) iSu :42.99 ( 1.56X) USC JVW 21.5 332 iPd :39.18 ( 0.05 ) iSd :41.83 (-0.15 ) USC CCK 24.3 337 iPu :39.53 (-0.04 ) iSd :42.81 ( 0.04 ) ***** 1995 JULY 31; 23:36 - HARTWELL 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 950731 233625.4 34.643 82.774 3.9 10 20 340 0.1 D 2.3 360 2.3 7.0 2.1 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC MMC 20.0 320 iPu 23:36:28.73 (-0.04 ) iSd 23:36:31.44 ( 0.05 ) USC SMT 36.7 331 iPu :31.42 (-0.03 ) iSu :36.16 ( 0.00 ) USC BG3 41.5 340 iPu :32.17 (-0.05 ) iSu :37.51 (-0.02 ) USC JVW 43.9 332 iPu :32.62 ( 0.02 ) iSd :38.10 (-0.12 ) USC CCK 46.6 335 iPd :33.17 ( 0.12 ) iSd :39.09 ( 0.08 ) USC MR10 136.3 104 iPd :46.86 (-0.66X) USC MR07 136.5 103 iPu :46.89 (-0.66X) iSu :37:02.66 (-2.17X) USC JSC 144.8 106 iPu :48.01 (-0.85X) iSd :05.40 (-1.75X) USC MR02 150.5 109 iPd :48.92 (-0.91X) iSd :06.74 (-2.14X) ***** 1995 AUGUST 2; 18:26 - 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 950802 182658.3 34.392 81.441 1.2 10 11 324 0.3 D 3.8 360 3.8 42.1 1.1 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC MR07 10.9 102 iPd 18:26:59.94 (-0.12 ) iSu 18:27:00.96 (-0.48 ) USC MR10 11.3 123 iPu :27:00.29 ( 0.16 ) iSd :00.69 (-0.86 ) USC MR01 14.9 116 iPd :01.06 ( 0.39 ) iSu :02.62 ( 0.11 ) USC JSC 20.8 127 iPu :01.77 ( 0.11 ) iSd :04.46 ( 0.20 ) USC MR02 29.4 139 iPu :03.36 ( 0.30 ) iSd :07.05 ( 0.34 ) ***** 1995 AUGUST 21; 19:09 - KEOWEE 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 950821 190909.1 34.768 83.015 8.5 8 9 275 0.1 C 1.3 360 1.3 1.7 1.4 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC MMC 9.2 82 iPu 19:09:11.17 ( 0.03 ) iSd 19:09:13.26 ( 0.50X) USC SMT 18.5 13 iPd :12.45 ( 0.03 ) iSd :15.15 ( 0.12 ) USC BG3 26.1 17 iPu :13.60 ( 0.03 ) iSu :17.08 ( 0.00 ) USC BC 27.7 357 iPu :13.78 (-0.04 ) iSu :18.37 ( 0.84X) USC CCK 28.4 4 iPu :13.82 (-0.10 ) iSd :17.62 (-0.08 ) ***** 1995 AUGUST 29; 17:15 - KEOWEE 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 950829 171502.6 34.764 83.016 2.9 10 9 278 0.1 C 1.1 360 1.1 4.6 1.7 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC MMC 9.4 79 iPu 17:15:04.35 ( 0.09 ) iSu 17:15:05.52 (-0.03 ) USC SMT 19.0 13 iPd :05.71 (-0.08 ) iSu :08.26 (-0.01 ) USC JVW 25.4 4 iPu :06.89 ( 0.07 ) iSu :11.02 ( 0.91X) USC BG3 26.6 17 iPu :06.94 (-0.06 ) iSu :10.45 ( 0.01 ) USC BC 28.2 357 iPu :07.25 (-0.01 ) iSu :10.99 ( 0.08 ) USC CCK 28.9 5 iPd :07.35 (-0.02 ) ***** 1995 OCTOBER 15; 22:12 - 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 951015 221210.0 34.361 81.329 2.0 10 3 301 0.1 C 0.6 360 0.6 0.7 2.3 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC MR10 2.9 196 iPu 22:12:10.52 (-0.09 ) iSd 22:12:11.14 ( 0.07 ) USC MR01 4.5 137 iPd :10.88 ( 0.07 ) iSd :11.30 (-0.12 ) USC MR05 10.4 183 iPu :11.79 ( 0.04 ) iSd :13.04 (-0.03 ) USC JSC 11.0 145 iPd :11.88 (-0.01 ) iSu :13.30 (-0.02 ) USC MR02 20.8 154 iPu :13.53 ( 0.07 ) iSd :16.11 ( 0.03 ) ***** 1995 DECEMBER 11; 17:38 - KEOWEE 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 951211 173834.5 34.775 83.074 4.0 5 20 348 0.0 C 0.7 360 0.7 2.7 1.6 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC SMT 19.7 29 iPu 17:38:37.85 (-0.01 ) iSd 17:38:40.46 ( 0.01 ) USC JVW 25.1 16 iPu :38.73 ( 0.00 ) iSu :41.98 (-0.01 ) USC BG3 27.5 28 iPd :39.11 ( 0.01 ) iSd :42.59 (-0.07X) ***** 1995 DECEMBER 15; 19:11 - KEOWEE 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 951215 191135.5 34.750 83.071 3.9 11 15 290 0.0 C 0.8 360 0.8 4.0 1.8 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC MMC 14.6 77 iPd 19:11:37.97 (-0.07 ) iSd 19:11:40.04 ( 0.05 ) USC SMT 22.0 24 iPd :39.24 ( 0.02 ) iSu :42.08 (-0.01 ) USC JVW 27.7 14 iPd :40.15 ( 0.03 ) iSu :43.74 ( 0.04 ) USC BG3 29.8 25 iPu :40.50 ( 0.04 ) iSd :44.24 (-0.06 ) USC BC 29.9 7 iPu :40.47 (-0.01 ) USC CCK 31.1 13 iPd :40.68 ( 0.01 ) iSd :44.63 (-0.05 ) ***** 1995 DECEMBER 27; 00:17 - KEOWEE 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 951227 001749.6 34.844 82.917 1.7 9 7 183 0.1 C 0.6 360 0.6 4.2 0.2 SRCE STA DIST (KM) AZM PHASE ARRIVAL TIME (RES) PHASE ARRIVAL TIME (RES) USC MMC 7.1 179 iPu 00:17:50.92 ( 0.02 ) iSd 00:17:51.86 (-0.02 ) USC SMT 10.8 333 ePd :51.52 ( 0.02 ) iSu :52.90 (-0.05 ) USC BG3 16.6 355 iPd :52.50 ( 0.07 ) iSu :54.53 (-0.07 ) USC CCK 21.0 341 iPu :53.16 ( 0.02 ) iSd :55.94 ( 0.08 ) USC BC 21.9 332 iPd :53.53 ( 0.24X) iSu :56.06 (-0.07 ) SEISMIC STATION LISTING AND NETWORK MAPS Stations operating in the SEUSSN during the report period are listed below. Changes to the network (new stations, stations that have been closed, etc.) may be found at the end of this listing. A list of operator code definitions may be found in the section entitled DEFINITIONS AND NETWORK OPERATOR CODES. After the station listing is a plot of all the 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 8409-9503 TVA Auburntown, TN AMG 32-03.56 84-13.06 122 7309- GSW Americus, GA ANTN 36-10.30 85-13.88 612 8305-9503 TVA Anderson, TN ASB 35-37.74 79-46.38 227 - UNC Asheboro, NC ATL 33-26.00 84-20.25 272 6306- GIT Atlanta, GA BAV 37-13.32 80-25.50 622 7309- VTSO Blacksburg, VA 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 86 - 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 8606-9503 TVA Brown Mtn., TN BTR 36-10.56 78-45.78 122 - UNC Butner, NC 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 CCK 35-01.37 82-59.49 701 9201- USC Bad Creek Res., SC 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 35-53.46 79-05.58 152 7508- UNC Chapel Hill, NC COR 35-33.30 78-59.34 91 UNC Corinth, NC COW 33-22.90 80-41.96 60 7710- USC Cow Castle Creek, SC CRTN 36-11.99 83-50.44 488 8408-9503 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 ELK 33-20.88 81-20.83 88 9511- WSRC Elko, SC ETT 35-19.56 84-27.30 588 8111- CERI Etowah, TN EVE 25-23.24 80-40.97 2 8910- UFL Homestead, FL FDKY 36-47.40 85-47.65 306 8703-9503 TVA Freedom, KY FGTN 36-26.02 83-11.72 509 9112- CERI TN FKT 35-47.04 86-58.26 321 9310-9503 TVA Franklin, TN GAI 29-39.02 82-20.01 51 7711- UFL Gainesville, FL GBTN 35-39.96 84-12.66 326 8303- CERI Greenback, TN 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 GRB 36-04.02 79-44.70 236 - UNC Greensboro, NC HAKY 37-06.34 86-35.10 169 8706-9503 TVA Hadley, KY HBF 32-56.85 80-19.96 10 7303- USC Harts Bluff, SC HWD 32-44.33 80-17.01 9 8303- CSU -USGS Hollywood, SC HWV 37-35.43 80-50.45 521 7804-9511 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 8903-9503 TVA Leola, AL 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 8512-9503 TVA Lookout Mtn., GA MCWV 39-39.49 79-50.74 200 - NEIC-WVGS Mont Chateau, WV 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 MOB 33-11.60 81-48.89 67 9510- WSRC Waynsboro, GA MOTN 36-37.08 87-59.20 177 8308-9503 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 8307-9503 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 NA12 37-59.29 77-52.62 134 7808- VTSO North Anna, VA NED 39-42.25 75-42.49 47 7211- DGS Newark, DE NPRS 33-15.42 81-38.28 79 91 - WSRC Savannah River Lab, SC OLT 35-09.00 85-01.44 445 9306-950 TVA Ooltewah, TN ORT 35-54.57 84-18.29 370 75 -950 TVA Oak Ridge, TN PBV 36-58.94 77-31.87 49 7811-960 VTSO Petersburg, VA PDTN 35-16.40 85-50.97 335 8509-950 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 SAR 27-10.53 82-27.94 4 8910- UFL Osprey, FL SGS 33-11.55 80-30.57 25 7303- USC St. George, SC SLTN 36-26.59 82-07.23 1280 8401-950 TVA Sullivan, TN SMT 34-55.85 82-58.26 498 7704- USC Smeltzer Mtn. (Jocassee), SC SRAV 33-19.50 81-40.80 91 - WSRC Savannah River Lab, SC SRPD 33-09.30 81-42.75 31 7608- WSRC Savannah River Lab, SC SRPN 33-19.74 81-35.33 95 7608- WSRC Savannah River Lab, SC SRPW 33-12.14 81-34.69 77 7608- WSRC Savannah River Lab, SC SVS 32-58.10 80-14.89 3 7603- USC Slandsville, SC TCT 36-00.32 87-33.17 245 8803-950 TVA Tennessee City, TN TKL 35-39.48 83-46.44 350 78 - UTK -TVA Tuckaleechee Caverns, TN TQTN 35-30.96 84-43.55 260 8607-950 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 VWV 37-27.96 80-23.50 963 8207- VTSO VA-WV Border WAK 30-14.83 84-17.90 5 9302- UFL Wakulla, FL WAS 32-50.81 80-16.30 9 8303- CSU -USGS West Ashley, SC 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 WYC 31-12.32 82-23.39 43 9304- UFL Waycross, GA CHANGES TO THE SEUSSN STATION LISTING Station Code Operator Locality Change ABTN TVA Auburntown, TN Closed March 31, 1995. ANTN TVA Anderson, TN Closed March 31, 1995. BRTN TVA Brown Mtn., TN Closed March 31, 1995. CRTN TVA Comb Ridge, TN Closed March 31, 1995. ELK WSRC Elko, SC Opened November, 1995. FDKY TVA Freedom, KY Closed March 31, 1995. FKT TVA Franklin, TN Closed March 31, 1995. HAKY TVA Hadley, KY Closed March 31, 1995. HPKT GITC-TVA Knoxville, TN Closed in 1990. HWV VTSO Hinton, WV Closed November 1, 1995. LAL TVA Leola, Alabama Closed March 31, 1995. LKGA TVA Lookout Mtn., GA Closed March 31, 1995. MCWV NEIC-WVGS Mont Chateau, WV Opened. MOB WSRC Waynsboro, GA Opened October, 1995. MOTN TVA Model, TN Closed March 31, 1995. MSAL TVA Monte Sano, AL Closed March 31, 1995. NPRS WSRC Savannah River Lab, SC Opened 1991. OLT TVA Ooltewah, TN Closed March 31, 1995. ONTN TVA Oneida, TN Closed in 1994. ORT TVA Oak Ridge, TN Closed March 31, 1995. PDTN TVA Piedmont, TN Closed March 31, 1995. SLTN TVA Sullivan, TN Closed March 31, 1995. TCT TVA Tennessee City, TN Closed March 31, 1995. TKL UTK -TVA Tuckaleechee Caverns, TN Operator change. TQTN TVA Tranquillity, TN Closed March 31, 1995. FIGURE 10. Seismic stations (triangles) in the SEUSSN. Solid triangles indicate stations operating during the entire report period. Shaded triangles indicate stations closed during the report period. Open triangles indicate inactive stations for the same period. 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. University of Florida Seismic Network. FIGURE 16. Virginia Tech Seismic Network. FIGURE 17. University of North Carolina-Chapel Hill Seismic Network. ACCESSING DIGITAL WAVEFORM DATA AND OTHER INFORMATION FROM THE VIRGINIA TECH SEISMOLOGICAL OBSERVATORY OVERVIEW: The Virginia Tech Seismological Observatory (VTSO) has established computer access to its catalog and digital waveform data through the worldwide web (http://www.geol.vt.edu/outreach/vtso.html) gopher, and anonymous ftp servers, also on node www.geol.vt.edu (128.173.184.38). Waveform data currently available include event data from the Virginia Regional Seismic Network and from the GSE (GSETT-2) short-period and broadband instruments located at Blacksburg, Virginia (co-sited with WWSSN station BLA). Network data files consist of 32 channels, digitized at 100 sps at the Blacksburg collection node, from ten sites in Virginia and West Virginia (currently). This acquisition system is being upgraded from its present 40 dB of dynamic range to a system with over 100 dB of dynamic range. The GSE data consist of six channels recorded with a 24 bit digitizer. The three short-period channels are sampled at 40 sps and the three broadband channels at 10 sps. Both the network and GSE stations are calibrated. A brief description of the available data is given below. For further information, help files are provided on the ftp and gopher servers. If one has problems, or wants data in a format other than that provided, contact Martin Chapman (chapman@vtso.geol.vt.edu or 540-231-5036). The BLA USNSN equipment officially went on-line in May 1995, but, as of this writing, has produced little data because of hardware problems. The borehole instruments are a three-component broadband sensor package from Guralp. The waveform data are available from the U.S. Geological Survey in Golden via the AutoDRM retrieval system. NEAR-REAL-TIME WAVEFORM DATA: Every 20 minutes, triggered event waveform data files from the Virginia Regional Seismic Network are transferred from the digital acquisition system to the anonymous ftp account on www.geol.vt.edu. These data are raw triggers with no event information. The data are in demultiplexed UNIX_SUDS_1 format. The source code and an executable version of a program to convert from UNIX_SUDS_1 format to SAC format (called st2sac) is available on the directory where these data files are located. SELECTED DIGITAL WAVEFORM DATA SETS: For events of particular interest, processed waveform data sets from the network and/or the GSE are prepared and put in subdirectories accessible through ftp and/or gopher. Waveform data from the network will have the timing and digitizing rates double-checked against a satellite time code channel. The waveform data are in either the SAC or the Center for Seismic Studies (CSS) database structure binary formats. OTHER INFORMATION AVAILABLE: Other data and information available from the Virginia Tech Seismological Observatory (node: vtso.geol.vt.edu) include: o Updated overview of available information by finger, telnet, or e-mail from quake@vtso.geol.vt.edu. o Unprocessed data from the GSE station for selected events (in binary CSS format). o Channel information such as station locations, instrument responses (in both pole-zero and frequency-amplitude-phase formats), station calibration histories, etc. o Southeastern U. S. Seismic Network (SEUSSN) Bulletins. o SEUSSN earthquake catalog (for July 1977 through the current Bulletin) and a catalog of historic and instrumentally located earthquakes for the southeastern United States (from the year 1698 through the current Bulletin). DEFINITIONS AND NETWORK OPERATOR CODES 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), MDB, MDL, MD: 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 AUAL - Auburn University, AL CERI - Center for Earthquake Research and Information, TN (formerly Tennessee Earthquake Information Center, TEIC, changed 7/1/87) 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 GIT - Georgia Institute of Technology, GA GSA - Geological Survey of Alabama, AL GSW - Georgia Southwestern College, GA MGS - Maryland Geological Survey, MD 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 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 UTK - University of Tennessee, Knoxville, TN 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 WSRC - Westinghouse Savannah River Company, SC WVGS - West Virginia Geological and Economic Survey, WV WVU - West Virginia University, WV SOUTHEASTERN U. S. BIBLIOGRAPHY (Post 1980) This bibliography lists papers on the seismicity of the southeastern United States and related subjects. Included are papers published since 1980--around the time that SEUSSN data would have begun to appear in the literature. Individual papers in various meeting proceedings are not listed. Instead, the proceedings themselves are provided. The editors would appreciate any suggestions of additional references that have been overlooked. Acree, Steven D., Jill R. Acree, and Pradeep Talwani (1988). The Lake Keowee, South Carolina earthquakes of February through July 1986, Seism. Res. Letters, v. 59, no. 2, pp. 63-70. Amick, David, Garry Maurath, and Robert Gelinas (1990). Characteristics of seismically induced liquifaction sites and features located in the vicinity of the 1886 Charleston, South Carolina earthquake, Seism. Res. Letters, v. 61, no. 2, pp. 117-130. Armbruster, J. G. and L. Seeber (1987). Seismicity 1886-89 in the southeastern United States. The aftershock sequence of the Charleston, SC, earthquake, Final Report (Sep 84-Feb 87), Nuclear Regulatory Commission Report NUREG/CR-4851, 45 pp. Bagwell, Joyce B. (1993). Intensity report for August 21, 1992 Ladson/Summerville, South Carolina earthquake, Appendix A, in SEUSSN Bull. 27, Virginia Tech Seismological Observatory, July, pp. 61-64. Beavers, James E., ed. (1981). Proceedings, Earthquakes and earthquake engineering: The eastern United States, v. 1-2, Knoxville, TN, 1189 pp. Beavers, James E., ed. (1986). Proceedings Third U.S. Nat. Conf. on Earthquake Engineering, v. 1, Earthquake Eng. Res. Inst., Charleston, SC, 812 pp. Bellini, John J., Tony J. Bartolini, Kenneth M. Lord, and Douglas L. Smith (1994). Determination of the coefficient of seismic attenuation in Florida, Appendix E, in SEUSSN Bull. 28, Virginia Tech Seismological Observatory, July, p. 63. Bollinger, G. A. (1981). Southeastern United States earthquakes - 1979, Earthquake Notes, v. 52, no. 2, pp. 40-41. Bollinger, G. A. (1982). Southeastern United States seismicity - Results from recent network monitoring, Proc., Third International Eqke. Microzonation Conf., v. 1, pp. 39-52. Bollinger, G. A. (1983). Speculations on the nature of the seismicity at Charleston, South Carolina, in Gohn, G. S., ed., Studies Related to the Charleston, South Carolina, Earthquake of 1886 - Tectonics and Seismicity, U.S. Geol. Survey Prof. Paper 1313, pp. T1-T11. Bollinger, G. A. (1985). Reinterpretation of the intensity data for the 1886 Charleston, South Carolina, earthquake, Societal Implications: Selected Readings, Eqke. Hazard Reduction Series 14, Fed. Emergency Management Agency, pp. 4-1 - 4-24 (Reprint of 1977 paper in U.S. Geol. Survey Prof. Paper 1028). Bollinger, G. A. (1986). The earthquake at Charleston, South Carolina, in 1886, Proc. Third U.S. Nat. Conf. on Eqke. Eng., v. 4, pp. 2,503-2,513. Bollinger, G. A. (1987). Seismic hazard in Virginia, Virginia Minerals, v. 24, pp. 29-35. Bollinger, G. A. (1987). Seismotectonics of the Virginia and eastern Tennessee seismic zones, in Jacob, K. H., ed., Proceedings, Symposium on Seismic Hazard, Ground Motions, Soil Liquefaction and Engineering Practice in eastern North America, NCEER Tech. Rept. 87-0025, pp. 202-216. Bollinger, G. A. (1989). Microearthquake activity associated with underground coal-mining in Buchanan County, Virginia, U.S.A., Pure and Applied Geophys., v. 129, pp. 407-413. Bollinger, G. A. (1992). Specification of source zones, recurrence rate, focal depth, and maximum magnitudes for earthquakes affecting the Savannah River site, in South Carolina, U.S. Geol. Survey Bull. 2017, 56 pp. Bollinger, G. A., M. C. Chapman, and T. P. Moore (1980). Central Virginia regional seismic network: Crustal velocity structure in central and southwestern Virginia, NUREG/CR-1217 (R6, RA), U.S. Nuclear Regulatory Commission, Contract No. NRC-04-77-134, 187 pp. Bollinger, G. A., M. C. Chapman, M. S. Sibol, and J. K. Costain (1985). An analysis of earthquake focal depths in the southeastern United States, Geophys. Res. Letters, v. 12, no. 11, pp. 785-788. Bollinger, G. A. and J. K. Costain (1988). Long-term cyclicities in earthquake energy release and major river flow volumes in Virginia and Missouri seismic zones, Seism. Res. Letters, v. 59, no. 4, pp. 279-283. 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, J. Geophys. Res., v. 94, no. B3, pp. 2857-2873. Bollinger, G. A., Arch C. Johnston, Pradeep Talwani, Leland T. Long, Kaye M. Shedlock, Matthew S. Sibol, and Martin C. Chapman (1991). Seismicity of the southeastern United States; 1698 to 1986, in Slemmons, D. B., E. R. Engdahl, M. D. Zoback, and D. D. Blackwell, eds., Neotectonics of North America: Boulder, CO, Geol. Soc. Am. Decade Map, v. 1, pp. 291-308. Bollinger, G. A., C. J. Langer, and S. T. Harding (1976). The eastern Tennessee earthquake sequence of October through December, 1973, Bull. Seism. Soc. Am., v. 66, no. 2, pp. 525-547. Bollinger, G. A. and M. S. Sibol (1982). Southeastern United States earthquakes - 1980, Earthquake Notes, v. 53, no. 4, pp. 50-52. Bollinger, G. A. and M. S. Sibol (1983). Southeastern United States earthquakes - 1981, Earthquake Notes, v. 54, no. 2, pp. 24-26. Bollinger, G. A. and M. S. Sibol (1983). Southeastern United States earthquakes - 1982, Earthquake Notes, v. 54, no. 2, pp. 27-29. Bollinger, G. A. and M. S. Sibol (1985). Seismicity, seismic reflection studies, gravity and geology of the central Virginia seismic zone: Part I. Seismicity, Geol. Soc. Am. Bull., v. 96, pp. 49-57. Bollinger, G. A., M. S. Sibol, and M. C. Chapman (1992). A comparison of magnitude scales for US earthquakes, Appendix F, in SEUSSN Bull. 26, Virginia Tech Seismological Observatory, June, pp. 63-76. Bollinger, G. A., M. S. Sibol, and M. C. Chapman (1992). Maximum magnitude estimation for an intraplate setting - Example: The Giles County, Virginia, seismic zone, Seism. Res. Letters, v. 63, no. 2, pp. 139-152. Bollinger, G. A., M. S. Sibol, M. C. Chapman, and J. A. Snoke (1993). Virginia Regional Seismic Network, Final Report (1986-1992), Nuclear Regulatory Commission Report NUREG/CR-6058, 103 pp. Bollinger, G. A., J. A. Snoke, M. C. Chapman, and M. S. Sibol (1989). Estimates of the occurrence and resulting effects of damaging earthquakes in Virginia, Virginia Minerals, v. 35, no. 3, Virginia Division of Mineral Resources, Charlottesville, VA, pp. 17-22. Bollinger, G. A., J. A. Snoke, M. S. Sibol, and M. C. Chapman (1986). Virginia Regional Seismic Network, Final Report (1977-1985), Nuclear Regulatory Commission Report NUREG/CR-4502, 57 pp. Bollinger, G. A., A. G. Teague, J. W. Munsey, and A. C. Johnston (1985). Focal mechanism analyses for Virginia and eastern Tennessee earthquakes (1978-1984), NUREG/CR-4288, U.S. Nuclear Regulatory Commission, Washington, DC, 83 pp. Bollinger, G. A. and Russell L. Wheeler (1982). The Giles County, Virginia, seismogenic zone - Seismological results and geological interpretations, U.S. Geol. Survey Open-File Rept. 82-585, 136 pp. Bollinger, G. A. and Russell L. Wheeler (1983). The Giles County, Virginia, seismic zone, Science, v. 219, pp. 1063-1065. Carts, D. A. and G. A. Bollinger (1981). A regional crustal velocity model for the southeastern United States, Bull. Seism. Soc. Am., v. 71, no. 6, pp. 1829-1847. Chapman, Martin C. (1995). A probabilistic approach to ground motion selection for engineering design, Bull. Seism. Soc. Am., v. 85, no. 3, pp. 937-942. Chapman, M. C., C. A. Powell, J. W. Munsey, and J. A. Snoke (1995). Determination and interpretation of eastern Tennessee focal mechanisms (1983-1993), Seism. Res. Letters, v. 67, p. 65. Chapman, Martin C. (1994). Probabilistic seismic hazard analysis for Virginia, Appendix C, in SEUSSN Bull. 17, Virginia Tech Seismological Observatory, July, pp. 59-60. Chapman, Martin C. and G. A. Bollinger (1984). Reliability of focal depth estimates from a small network, Eqke. Notes, v. 55, no. 4, pp. 16-25. Chapman, Martin C., G. A. Bollinger, M. S. Sibol, and D. E. Stephenson (1990). Influence of the coastal plain sedimentary wedge on strong ground motions from the 1886 Charleston, South Carolina, earthquake, Earthquake Spectra, v. 6, no. 4, pp. 617-640. Chapman, Martin C., J. A. Snoke, and G. A. Bollinger (1988). A procedure for calibrating short-period telemetered seismograph systems, Bull. Seism. Soc. Am., v. 78, no. 6, pp. 2077-2088. (Excerpts also in Appendix E, SEUSSN Bull. 22, Virginia Tech Seismological Observatory, December, pp. 87-88.) Cornagie, Donald P. and Donna M. Speranzella (1986). 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Tarr, Arthur C., Pradeep Talwani, Susan Rhea, David Carver, and David Amick (1981). Results of recent South Carolina seismological studies, Bull. Seism. Soc. Am., v. 71, no. 6, pp. 1883-1902. Teague, Alan G., G. A. Bollinger, and Arch C. Johnston (1986). Focal mechanism analysis for eastern Tennessee earthquakes (1981-1983), Bull. Seism. Soc. Am., v. 76, no. 1, pp. 95-109. Tie, An, Jeih-San Liow, and L. T. Long (1986). Study of traveltime residuals at the seismic stations in the southeastern Tennessee area, Appendix F, in SEUSSN Bull. 18, Virginia Tech Seismological Observatory, December, pp. 73-77. Tsoflias, George P. (1991). A note on the Goochland County, Virginia earthquake of March 15, 1991, Seism. Res. Letters, v. 62, no. 3-4, pp. 225-231. (Excerpts also in SEUSSN Bull. 26, pp. 61-62.) Vlahovic, G., C. A. Powell, M. C. Chapman, and M. S. Sibol (1995). P and S wave velocity models for the southern Appalachian crust, Seism. Res. Letters, v. 67, p. 76. Viret, Marc, G. A. 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Virginia Tech Seismological Observatory estimates of completeness for the southeastern U.S. seismicity catalog, Appendix D, in SEUSSN Bull. 18, Virginia Tech Seismological Observatory, December, p. 65. Wheeler, R. L. and G. A. Bollinger (1984). Seismicity and suspect terranes in the southeastern United States, Geology, v. 12, pp. 323-326. Yao, Paul C. and James Dorman (1992). Short-period surface-wave dispersion and shallow crustal structure of central and eastern Tennessee, Bull. Seism. Soc. Am., v. 82, no. 2, pp. 962-979. APPENDIX A Eastern Section - Seismological Society of America abstracts on the eastern Tennessee Seismic Zone. NOTE: These results were presented at the 67th Annual Meeting of the Eastern Section of the Seismological Society of America in Palisades, New York, October 11-13, 1995. Seismological Research Letters, v. 67, no. 1, p. 65. DETERMINATION AND INTERPRETATION OF EASTERN TENNESSEE FOCAL MECHANISMS (1983-1993) CHAPMAN, M. C., Department of Geological Sciences, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061-0420; POWELL, C. A., Department of Geology, University of North Carolina, Chapel Hill, NC 27599; MUNSEY, J. W., Tennessee Valley Authority, 400 West Summit Hill Dr., WT9A, Knoxville, TN 37902; SNOKE, J. A., Department of Geological Sciences, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061-0420. Eastern Tennessee contains one of the most active seismic zones in eastern North America. The 300 km long seismic zone has a SW-NE linear trend and is associated with major potential field anomalies. The depth range of the earthquakes is from near surface to 29 km. We have reexamined and updated the body of focal mechanical solutions for earthquakes occurring in this area during the period 1983-1993. Single event focal mechanisms were determined using P-wave first-motion polarities. The data set was obtained from the archives of the Tennessee Valley Authority and the University of Memphis. The solution algorithm systematically searches the focal sphere for all possible mechanisms compatible with a given set of first-motion polarity data (Snoke et al., 1984). P-wave take-off angles and source-station azimuths about the focal sphere were derived from a joint inversion for velocity structure and hypocenter location using 492 eastern Tennessee earthquakes (Vlahovic et al., 1995). Of the more than 40 events for which mechanisms could be derived, 27 were judged to be well constrained to the extent that uncertainty in the orientation of the nodal planes is at most a few degrees. These 27 earthquakes occurred throughout the seismic zone and had magnitudes ranging from 2.0 to 4.2. The well-constrained focal mechanisms exhibit a consistent pattern. The majority of solutions show right-lateral, strike-slip on planes striking north to northeast. Only two of the mechanisms feature thrust or normal faulting, defined by rake angles between 45 and 135 degrees (thrust) and -45 to -135 degrees (normal). Prior to 1987, 9 out of 10 well-constrained focal mechanisms featured N to NNE striking nodal planes. After 1987, 9 of 17 mechanisms also exhibit N to NNE striking nodal planes. However, 7 of the 17 post-1987 mechanisms feature nodal planes striking NNE to NE. The latter events are significant, from the standpoint of hazard assessment, in that the strike of one nodal plane parallels the long dimension of the seismic zone and potential field anomalies. Considering both variations in fault strength and uncertainty in the orientation of the regional stress field, the possibility that future ruptures might propagate along segments aligned with the trend of the zone and produce shocks larger than the historical maximum (mb 4.6) cannot be ruled out. Temporal shifts in the mechanisms and the correlation with potential field anomalies and crustal structure can be constrained further only by continued network monitoring in eastern Tennessee. Seismological Research Letters, v. 67, no. 1, p. 75. A REVIEW OF SOUTHERN APPALACHIAN SEISMICITY: THE CASE FOR CONTINUED NETWORK MONITORING IN THE REGION SIBOL, M. S., CHAPMAN, M. C., SNOKE, J.A., Department of Geological Sciences, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061-0420; POWELL, C. A., Department of Geology, University of North Carolina, Chapel Hill, NC 27599. The southern Appalachian region has not experienced large (M>6) earthquakes in historical time. However, the region is one of the more seismically active areas in eastern North America. Pre-instrumental estimates of felt earthquake locations, as well pre-network, instrumental epicenter determinations, serve only to define a rather diffuse scattering of seismicity in the region. Earthquake location accuracy and detection capability in this region were greatly increased in the mid-1980's with the advent of several independently operated networks. The combined network data have revealed that the seismicity is not random: the frequent smaller magnitude (M<3) earthquakes have clearly defined a linear concentration of energy release in eastern Tennessee, which is surrounded by a halo of more diffuse activity. In addition, focal mechanisms derived from the network data indicate a coherent style of faulting throughout the 300 km long eastern Tennessee seismic zone, and extending throughout the brittle section of the crust. There is some evidence that both the locations of the energy release as well as the orientation of faulting varies with time. Finally, the network data have revealed an unequivocal association of seismicity with major potential field anomalies, a rarity in eastern North America. In recent years, the reduction of operating network stations in this region has severely impacted detection and location capability, and obviates any opportunity for reliable focal mechanism determination. A few modern, high-dynamic range, broadband stations have been installed in the region, mostly at large distances from the seismic activity. We demonstrate that a sparse network of stations at large epicentral distances from small shocks cannot provide the quantity (and quality) of data necessary to explore potentially revealing aspects of the seismicity. This is because a sparse network cannot locate micro-earthquakes with precision, and can provide little constraint on focal mechanisms due to path uncertainties and low signal/noise ratios. We argue that a certain minimum station density is required for successful study of the region, regardless of the bandwidth and dynamic range of digital waveform data. Seimological Research Letters, v. 67, no. 1, p. 76. P AND S WAVE VELOCITY MODELS FOR THE SOUTHERN APPALACHIAN CRUST VLAHOVIC, G., and POWELL, C. A., Dept. of Geology, University of North Carolina, Chapel Hill, NC 27599. CHAPMAN, M. C., and SIBOL, M. S., Dept. of Geological Sciences, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061. One and three dimensional crustal velocity models have been computed for a portion of the southern Appalachians containing the eastern Tennessee seismic zone. This zone trends NE-SW and is associated with prominent potential field anomalies. The original data set consisted of 522 events with a total of 11, 888 arrival times. Events were recorded by the Southern Appalachian Regional Seismic Network from 1984 to 1993 and initially reported in SEUSSN Bulletins, no 14 to 28. The final data set consisted of 492 events, with a minimum of eight phases each. Arrivals with residuals greater than 1 sec and Pn arrivals were excluded from the data set. A new 1D velocity model was developed by an iterative procedure that simultaneously inverts for the velocity model and relocates the events (Roecker et al., 1987). The starting velocity model was developed for the Giles County, Virginia seismic zone. Different layer geometries were used, but introduction of layers less than 5 km thick did not decrease the variance and produced low velocity layers. Relative to the starting model used, all 1D velocity models showed an increase in velocity for the upper 15 km of the crust. Our final 1D velocity model has the smoothest increase of velocity with depth and a stable Vp/Vs ratio (1.72-1.74) through all layers. Results of the 3D inversion showed strong anomalies, ranging from -7 % to 13 %, in the upper 6 km of the crust. The velocity anomalies correlate well with the gravity map of the eastern Tennessee seismic zone. Anomalies were significantly smaller in the deeper layers, ranging between + 5 %. The spatial distribution and magnitudes of P and S wave anomalies are very similar. The most distinct anomalies can be traced through the inversion volume. Higher velocities are associated with the more seismogenic crust SE of the New York- Alabama magnetic lineament. Lower velocities are found NW of the lineament and they are associated with less seismogenic crust. Relocation of events using the new 1D and 3D velocity models did not change the original spatial distribution of events significantly. Most events occur between 5 and 20 km depth. Relocation using the new velocity models decreased the number of events with hypocenters exceeding 25 km depth.