BULLETIN NO 9 TABLE OF CONTENTS Page Introduction 1 Southeastern United States Seismicity 10 List of Figures 1. Seismic Stations Operating During the Period July - December 1981 2 2. South Carolina Seismic Network 3 3. Virginia Tech Seismic Network 4 4. Georgia Tech Seismic Network 5 5. Alabama Seismic Network 6 6. Eastern Tennessee Seismic Network 7 7. Report Period Epicenter Map 11 8. Earthquake Epicenters for the Period July 1977 - December 1981 12 List of Tables 1. Seismic Stations Operating During Report Period 13 2. Earthquakes During Report Period 16 Acknowledgments 35 Appendix - Detection and Location Capability of the Southeastern United States Seismic Network 36 Mailing List 43 INTRODUCTION This report is the ninth semi-annual BULLETIN OF SEISMICITY OF THE SOUTHEASTERN UNITED STATES. It covers the period July through December, 1981. The organizations supplying data for this BULLETIN are the Carolina Power and Light Company, the E. I. DuPont de Nemours and Company, Inc. (Savannah River Laboratory), University of Florida, Georgia Institute of Technology, University of North Carolina, Tennessee Earthquake Information Center, Tennessee Valley Authority, Union Carbide Corporation (Nuclear Division), United States Geological Survey, Virginia Division of Mineral Resources, Virginia Polytechnic Institute and State University, Washington and Lee University and West Virginia University. Table 1 is a listing, by state, of the 101 stations operating during the period July-December, 1981. The format of the information included in the table is as follows: 1). Three or four letter station code, 2). Station latitude in decimal degrees, north, 3). Station longitude in decimal degrees, west, 4). Station elevation, meters, 5). Geographic name of station, 6). Station operator. Figure 1 is a geographic map of the entire Southeastern United States Seismic Network (SEUSSN). Figures 2, 3, 4, 5 and 6 show the South Carolina, Virginia, Georgia, Alabama and Eastern Tennessee Networks, respectively. Each of these networks has station spacings too close to be shown clearly on Figure 1. Table 2 is a listing of the hypocentral parameters, phase arrival times and magnitude estimates for earthquakes that occurred in the southeastern United States during the report period. Most items in the listing are self-explanatory and all times are Coordinated Universal Time. Some entries that might require definition are: AZ= Epicenter-to-station azimuth in degrees, DIST= Epicentral distance in degrees (Deg) or kilometers (Km), DPTH= Focal depth estimate in Km; FXD indicates that the depth was held fixed during the epicentral determination, GAP= The largest sector, in degrees, where there were no observing stations (HYPO71), HOR SEMI-AXES (KM, DEG)= Lengths (km) and azimuths (deg) of principal axes (horizontal projection) of error ellipsoid (HYPOELLIPSE; J. C. Lahr, USGS Open File Report 79-431), MBN= Body wave magnitude determination using Nuttli's formulas for the Lg phase, MEUS= Body wave magnitude determination using Evernden's formula for the Pn phase, ML= Local magnitude; contact agency or group making the estimate for details on their specific procedure, MLD= Local magnitude determined from duration of vibrations, MSZ= Surface wave magnitude determined from the long period vertical seismogram, NO= Number of phases used in the hypocenter determination, Q= Solution quality of error ellipsoid based on length of largest semi-axis (HYPOELLIPSE), or Solution quality of the hypocenter (HYPO71), RES= P wave residual in seconds; observed arrival time - calculated arrival time, RMS= Root mean square error of time residuals in sec (HYPO71), VERT SEMI-AXIS (KM)= Length (km) of principal vertical axis of error ellipsoid (HYPOELLIPSE). *XXXX= Agency or group that made the hypocentral determination. Even-numbered BULLETINS have a Station Information Appendix that gives specific information on the operator, seismograph types, operating characteristics, recording formats, etc. Odd-numbered BULLETINS have an Appendix that presents the detection and location capability of the SEUSSN. SOUTHEASTERN UNITED STATES SEISMICITY Figure 7 is an epicenter map for the report period, July 1 - December 31, 1981, while Figure 8 is a cumulative epicenter map for the 4.5 year period from July 1, 1977, through December 31, 1981. There were 33 earthquakes (0.7 le M le 2.7) located in the southeastern United States during the last six months of 1981. Of those, only 2 in Virginia were felt events. The activity was well distributed throughout the region: 5 in Alabama, 2 in Georgia, 3 in Kentucky, 3 in North Carolina, 12 in South Carolina, 3 in Tennessee and 5 in Virginia. TABLE 1 LIST OF OPERATING SEISMIC STATIONS BY STATE JANUARY - JUNE, 1981 STA LATITUDE LONGITUDE ELEVATION ID DEG. (N) DEG. (W) METERS LOCALITY OPERATOR ALABAMA BKA 33.6339 87.9690 122 KENNEDY GIT-GSA HGA 34.2602 85.8464 384 COLLINSVILLE GIT-GSA HVA 34.0264 86.7692 195 HANCEVILLE GIT-GSA MLA 32.7055 87.6936 55 SAWYERVILLE GIT-GSA OCA 34.6138 86.4352 250 OWENS CROSSROADS GIT-GSA TDA 33.5417 86.0247 181 TALLADEGA GIT-GSA TSA 33.2561 87.0675 180 TANNEHILL STATE PARK GIT-GSA FLORIDA GAI 29.6458 82.3394 51 GAINESVILLE UFL GEORGIA AMG 32.0594 84.2177 122 AMERICUS GSW ATL 33.4333 84.3375 272 ATLANTA GIT BEV 34.0893 82.7334 158 CLARK HILL RESERVOIR GIT CDG 34.6108 84.6713 332 CARTERS DAM GIT CH5 33.7332 82.3118 114 CLARK HILL RESERVOIR GIT CH6 33.8792 82.5194 130 CLARK HILL RESERVOIR GIT CRG 34.6581 84.5781 418 CARTERS DAM GIT EP1 33.9514 82.5136 134 CLARK HILL RESERVOIR GIT ETG 33.2912 83.3507 137 WALLACE DAM NET GIT GBG 33.4994 83.2112 174 WALLACE DAM NET GIT IVA 34.2721 82.7460 168 CLARK HILL RESERVOIR GIT LDV 34.1479 82.6833 162 CLARK HILL RESERVOIR GIT RCG 34.975 85.348 468 ROCK CITY TEIC REG 33.4421 83.3371 178 WALLACE DAM NET GIT RMG 34.3359 85.3160 337 ROCKY MOUNTAIN NET GIT SMG 34.3495 85.3463 314 ROCKY MOUNTAIN NET GIT TVG 34.3771 85.3023 323 ROCKY MOUNTAIN NET GIT WDG 33.3440 83.1752 177 WALLACE DAM NET GIT NORTH CAROLINA AVNC 35.624 82.531 ASHEVILLE TEIC CEH 35.8908 79.0928 152 CHAPEL HILL UNC RNC 35.63 78.98 85 RALEIGH CPL SOUTH CAROLINA BCS 32.9812 80.0717 12 BAPTIST COLLEGE USGS BOW 33.3736 80.6431 35 BOWMAN USGS CCS 32.8162 80.2553 9 CAWCAW SWAMP USGS CHF 34.0247 82.5867 152 CALHOUN FALLS USGS COW 33.3842 80.7008 33 COW CASTLE CREEK USGS HBF 32.9330 80.3780 10 HARTS BLUFF USGS JSC 34.2790 81.2580 120 JENKINSVILLE USGS LHS 34.4790 80.8080 120 LIBERTY HILL USGS MGS 32.8970 80.1408 9 MIDDLETON GARDENS USGS MTT 33.7513 81.6362 182 MONETTA USGS MR01 34.3319 81.2957 131 MONTICELLO RESERVOIR SCEG MR02 34.1930 81.2301 84 MONTICELLO RESERVOIR SCEG MR03 34.3514 81.4569 125 MONTICELLO RESERVOIR SCEG MR04 34.4287 81.2166 145 MONTICELLO RESERVOIR SCEG OSB 33.5472 80.8444 91 ORANGEBURG USGS PBF 32.8628 79.7607 0 PORCHER BLUFF USGS PBS 33.2790 80.2640 25 PIGEON BAY USGS PPS 32.8237 80.0400 4 PIERPONT USGS PRM 34.0833 82.3633 254 PARSONS MOUNTAIN USGS ROW 33.3650 80.7944 35 ROWESVILLE USGS SBK 32.5672 80.1803 2 SEABROOK USGS SGS 33.1930 80.5120 25 ST GEORGE USGS SRPD 33.1550 81.7125 31 SAVANNAH RIVER LAB DUP SRPN 33.3290 81.5888 95 SAVANNAH RIVER LAB DUP SRPW 33.2023 81.5782 77 SAVANNAH RIVER LAB DUP SVS 32.9688 80.2487 3 SLANDSVILLE USGS TRK 33.1221 79.7778 10 TURKEY CREEK USGS VEW 32.7177 79.9415 3 OCEANVIEW USGS VRN 33.0375 80.9417 30 VARNEVILLE USGS WMS 33.4358 80.7408 34 W MIDDLE SCHOOL USGS ZIN 33.1072 80.1628 30 MT ZION CHURCH USGS TENNESSEE BHT 35.847 84.945 826 BLOW HOLE TEIC ETT 35.326 84.455 588 ETAWA TEIC HPK 35.926 83.879 305 KNOXVILLE TEIC/TVA HWR 35.758 83.938 311 MARYVILLE TEIC LGAR 34.6514 90.6581 107 LA GRANGE TEIC* ORT 35.9095 84.3048 370 OAK RIDGE UCC PGM 34.4667 90.1167 TEIC* SFTN 35.3575 90.0188 -23 SHELBY FOREST TEIC* TKL 35.6582 83.7744 355 TUCKALEECHEE CAVERNS TEIC *In easternmost Tennessee near New Madrid, Missouri - not in southeastern United States VIRGINIA BAV 37.2220 80.4250 622 BLACKSBURG VPI BLA 37.2114 80.4211 634 BLACKSBURG VPI BV1 38.1781 79.6611 768 BATH COUNTY VPI BV2 38.1367 79.9194 610 BATH COUNTY VPI BV3 38.2383 79.7667 750 BATH COUNTY VPI CBN 38.2050 77.3733 70 CORBIN USGS CNV 38.2050 77.3733 70 CORBIN VPI CVL 37.9813 78.4608 167 CHARLOTTESVILLE VPI CVV 37.9814 78.4608 167 CHARLOTTESVILLE DMR FRV 37.2030 78.3593 216 FARMVILLE VPI FTV 38.8661 78.1688 341 FRONT ROYAL DMR GHV 37.7942 78.1073 107 GOOCHLAND VPI LEX 37.7894 79.4417 311 LEXINGTON WAL MSH 37.1150 80.4012 684 CHRISTIANSBURG VPI NAV 37.3167 80.7931 610 NARROWS VPI NA2 38.1270 77.7470 82 NORTH ANNA VPI NA5 37.9930 77.7470 76 NORTH ANNA VPI NA11 37.9830 77.6850 84 NORTH ANNA VPI NA12 37.9830 77.8795 125 NORTH ANNA VPI PBV 36.9823 77.5312 49 PETERSBURG VPI PUV 37.0235 80.8158 652 PULASKI VPI VBV 36.7853 76.1080 5 VIRGINIA BEACH TCC WEST VIRGINIA BV4 38.3572 79.8278 814 POCAHONTAS COUNTY VPI HWV 37.5905 80.8408 521 HINTON VPI MRG 39.6331 79.9544 281 MORGANTOWN WVU PMW 37.5097 80.4308 976 PETERS MOUNTAIN VPI PWV 37.3348 81.0488 820 PRINCETON VPI OPERATOR CODE CPL - Carolina Power and Light Company DMR - Virginia Division of Mineral Resources DUP - E. I. DuPont de Nemours and Company, Inc. GIT - Georgia Institute of Technology GSA - Geological Survey of Alabama GSW - Georgia Southwestern College SCEG - South Carolina Electric and Gas Company TCC - Tidewater Community College (Va) TEIC - Tennessee Earthquake Information Center TVA - Tennessee Valley Authority UCC - Union Carbide Corporation UFL - University of Florida UNC - University of North Carolina USGS - United States Geological Survey VPI - Virginia Tech WAL - Washington and Lee University WVU - West Virginia University TABLE 2 LIST OF SOUTHEASTERN UNITED STATES EARTHQUAKES FOR THE TIME PERIOD 1 JULY 1981 THROUGH 31 DECEMBER 1981 26 JULY 1981 BREVARD, NORTH CAROLINA MLD= 1.7 (TEIC) *TEIC LAT= 35.40N LONG= 82.77W H= 08-59-21.7 DPTH= 15 KM, FXD NO= 5, RMS RES= 0.26 SEC, GAP= 223 DEG, ERH= 3.2 KM, ERZ= 12.7 KM STA PHASE TIME DIST (KM) AZ(DEG) RES(SEC) AVNC IP 08-59-27.90 32.6 41 0.17 ES -32.00 -0.18 TKL IP -37.4 95.2 287 0.09 IS -48.8 0.04 PWLA E(P) 09-00-28.80 484.4 264 -8.10X ES -01-31.62 -0.37 NOTE: For additional details refer to: TEIC PRELIMINARY SEISMOLOGICAL BULLETIN, JULY-SEPTEMBER, VOL. II, NO. 5, November, 1981, 37 p. 30 JULY 1981 ORANGE, VIRGINIA MLD= 1.4 (VPI) *VPI LAT= 38.194N LONG= 78.088W H= 11-59-48.5 DPTH= 6.0 KM NO= 18, RMS RES= 0.31 SEC, GAP= 180 DEG, ERH= 2.7 KM, ERZ= 6.7 KM, Q= C; HYPOELLIPSE SEMI-AXES (LENGTH IN KM, AZIMUTH IN DEG): HORIZONTALS ARE 1.2, -112; 2.7, -22 AND THE VERTICAL IS 6.7 KM. QUALITY= C. Felt (III) in vicinity of Orange and Unionville, Virginia: Houses shook, windows and pictures rattled, booming noise heard, water well reported muddied. STA PHASE TIME DIST (KM) AZ (DEG) RES (SEC) NA12 IPC 11-59-53.70 29.7 142 0.22 S -57.10 -0.02 NA2 IPC -53.47 30.8 104 -0.17 S -57.26 -0.15 NA5 IPC -54.68 37.3 127 -0.02 S -59.49 0.25 CVL IPD -54.75 40.4 234 -0.46 S -59.90 -0.21 CNV IPD -58.90 62.6 89 0.08 S 12-00-05.60 -0.76 FRV IPD -06.70 112.6 192 -0.33 S -20.65 0.09 BV1 IPC -12.00 137.8 269 0.85 S -28.00 0.31 BV3 EP -13.70 147.2 272 1.12X S -29.70 -0.47 BV4 EP -14.50 153.3 277 0.97X S -31.60 -0.21 BV2 IPD -15.20 160.6 268 0.56 S -33.00 -0.72 31 JULY 1981 EAST TENNESSEE MLD= 1.9 (TEIC) POSSIBLE BLAST *TEIC LAT= 36.37N LONG= 84.49W H= 01-36-14.6 DPTH= 5.0 KM, FXD NO= 5, RMS RES= 1.18 SEC, GAP= 231 DEG, ERH= 20.5 KM, ERZ= 13.8 KM STA PHASE TIME DIST (KM) AZ (DEG) RES (SEC) TKL IP 01-36-31.3 101.4 140 -0.43 AVNC IP -46.61 194.5 115 0.57 IS -37-07.12 0.03 PWLA IP -10.41 358.6 244 -0.76 ES -54.7 0.52 NOTE: For additional details refer to - TEIC PRELIMINARY SEISMOLOGICAL BULLETIN, JULY-SEPTEMBER, VOL. II, NO. 5, November, 1981, 37 p. 24 AUGUST 1981 PULASKI, VIRGINIA MLD= 1.0 (VPI) *VPI LAT= 36.945N LONG= 80.746W H= 11-50-11.2 DPTH= 16.8 KM NO= 13, RMS RES= 0.24 SEC, GAP= 183 DEG, ERH= 1.6 KM, ERZ= 2.8 KM, Q= C; HYPOELLIPSE SEMI-AXES (LENGTH IN KM, AZIMUTH IN DEG): HORIZONTALS ARE 1.1, -133; 1.6, -43 AND VERTICAL IS 2.8 KM. QUALITY= B. STA PHASE TIME DIST (KM) AZ (DEG) RES (SEC) PUV IP 11-50-14.80 10.7 324 0.17 S -17.15 0.02 NAV IPC -18.55 41.3 354 -0.12 S -23.90 -0.18 BLA P -18.60 41.4 44 -0.08 S -23.75 -0.34 PWV P -20.40 50.9 328 0.25 S -26.20 -0.42 HWV IP -23.90 72.1 353 0.55 S -32.50 0.39 BV2 EP -37.20 151.1 29 1.75X S -53.60 0.66X BV3 EP -38.90 167.6 31 0.91X S -58.00 0.69X FRV S -51-09.60 214.1 82 0.15 AVNC EP -50-45.70 217.3 228 0.08 S -51-10.20 -0.23 GHV S -20.00 251.9 68 1.76X 26 AUGUST 1981 HAMILTON, ALABAMA MLD= 1.9 (GIT), 2.4 (TEIC) *GIT LAT= 34.104N LONG= 87.989W H= 04-05-32.6 DPTH= 0.0 KM, FXD STA PHASE TIME STA PHASE TIME PWL PLG 04-05-49.5 OCA PLG 04-05-58.2 SLG -06-01.1 SLG -06-16.9 MLA PLG -05-58.1 HVA PLG -05-52.4 SLG -06-18.6 SLG -06-05.7 *TEIC LAT= 34.17N LONG= 87.93W H= 04-05-34.5 DPTH= 5.0 KM, FXD NO= 8, RMS RES= 0.54 SEC, GAP= 110 DEG, ERH= 3.2 KM, ERZ= 4.2 KM STA PHASE TIME DIST (KM) AZ (DEG) RES (SEC) PWLA IP 04-05-49.38 90.8 351 -0.34 ES 06-01.10 0.21 HVA EP 05-53.0 108.4 98 0.42 IS 06-05.9 0.06 OCA EP 05-58.0 145.7 70 -0.66 IS 06-16.9 0.52 LGAR EPN -12.95 256.6 282 -0.38 ESN -40.5 1.02X SFTN ES -37.5 232.6 304 0.81 NOTE: For additional details refer to - TEIC PRELIMINARY SEISMOLOGICAL BULLETIN, JULY-SEPTEMBER, VOL. II, NO. 5, November, 1981, 37 p. 4 SEPTEMBER 1981 SUMMERVILLE, GEORGIA MLD= 2.6 (TEIC), 2.5 (GIT) *GIT LAT= 34.616N LONG= 85.164W H= 17-21-43.5 DPTH= 0.0 KM, FXD STA PHASE TIME STA PHASE TIME OCA PLG 17-22-04.3 MLA PLG 17-22-34.6 SLG -17.6 SLG -23-12.6 HVA PLG -11.0 PWL PLG -22-27.2 SLG -30.6 SLG -58.6 BEV PLG -21.9 AVN PN -22.7 SLG -49.0 SLG -58.4 CH6 PN -24.2 HPK PLG -15.3 PLG -26.0 SLG -37.5 SLG -55.0 TKL PN -12.4 REG PLG -19.2 PLG -13.1 SLG -44.8 SLG -33.5 *TEIC LAT= 34.64N LONG= 85.17W H= 17-21-44.6 DPTH= 3.5 KM NO= 18, RMS RES= 0.36 SEC, GAP= 130 DEG, ERH= 0.9 KM, ERZ= 2.4 KM STA PHASE TIME DIST (KM) AZ (DEG) RES (SEC) OCA P 17-22-04.3 116.3 268 0.15 S -17.6 -0.92 HVS P -11.0 161.9 245 -0.14 S -30.6 -0.03 TKL IP -12.4 170.0 48 0.02 IS -32.7 -0.07 REG P -19.2 215.0 128 -0.07 S -44.8 0.09 BEV P -21.9 232.1 105 0.00 S -49.0 -0.26 CH6 P -26.0 256.7 108 0.34 S -55.0 -0.77 AVNC EP -26.68 264.0 65 -0.09 ES -58.39 0.69 PWLA IP -27.19 267.7 278 -0.15 IS -58.56 -0.13 MLA P -34.60 317.8 227 1.59 S -23-12.60 0.62 LGAP EP -22-54.46 503.2 270 -8.94X ELG -24-04.72 -7.95X WLA ELG -07.38 NOTE: For additional details refer to - TEIC PRELIMINARY SEISMOLOGICAL BULLETIN, JULY-SEPTEMBER, VOL. II, NO. 5, November, 1981, 37 p. Additional Data HPK P 17-22-15.8 S -37.5 9 SEPTEMBER 1981 EASTERN KENTUCKY (PAINTSVILLE) BLAST *USGS LAT= 37.732N LONG= 82.630W H= 12-03-59.0 DPTH= 0.0 KM, FXD NO= 14, STD ERROR= 0.4 SEC STA PHASE TIME DIST (KM) AZ (DEG) RES (SEC) PIV3 P 12-04-04.2 33 283 0.1 PIV1 P -04.2 33 315 0.0 PWV P -24.0 145 107 -0.3 HWP P -25.9 156 95 -0.2 NAV P -27.1 167 105 -0.4 PUV P -28.8 178 116 0.1 BLA P -32.4 200 106 0.4 AVNC P -37.6 234 178 1.7X ORT P -38.6 256 217 0.4 TKL P -38.4 256 204 0.1 BV3 P -39.7 256 76 0.7 IN3 P -47.0 322 303 -0.5 AN10 P -50.0 345 333 0.1 JSC P -57.0 400 162 -0.5 PRM P -58.0 400 176 0.1 PWLA P -05-18.6 578 240 -1.0X Additional Data HWR EP 12-04-39.2 ES -05-11.0 14 SEPTEMBER 1981 NORTHEAST ALABAMA MLD= 1.6 (TEIC) *TEIC LAT= 34.60N LONG= 85.98W H= 17-13-33.4 DPTH= 14.3 KM NO= 6, RMS RES= 0.21 SEC, GAP= 812 DEG, ERH= 6.7 KM, ERZ= 1.4 KM STA PHASE TIME DIST (KM) AZ (DEG) RES (SEC) OCA IP 17-13-40.4 41.7 271 -0.17 IS -45.9 0.09 PWLA IP -14-03.52 195.2 282 0.06 ES -25.32 -0.13 TKL EP -08.2 232.7 59 0.15 ES -33.2 -0.20 NOTE: For additional details refer to - TEIC PRELIMINARY SEISMOLOGICAL BULLETIN, JULY-SEPTEMBER, VOL. II, NO. 5, November, 1981, 37 p. 28 SEPTEMBER 1981 ALABAMA-GEORGIA BORDER AREA MLD= 2.0 (GIT), 1.9 (TEIC) *GIT LAT= 34.600N LONG= 85.409W H= 18-03-34.0 DPTH= 0.0 KM, FXD STA PHASE TIME STA PHASE TIME HGA PLG 18-03-44.0 RMG PLG 18-03-40.5 SLG -47.6 SLG -43.5 OCA PLG -51.1 HPK PN -04-05.5 SLG -04-01.5 SN -28.9 HVA SLG -13.9 TKL PLG -06.6 LDV PLG -17.9 SLG -28.7 SLG -46.5 PWL PLG -14.4 CH6 PLG -21.9 SN -41.1 SLG -52.0 AVN PLG -21.1 SLG -53.2 *TEIC LAT= 34.57N LONG= 85.44W H= 18-03-35.1 DPTH= 5.0 KM, FXD NO= 12, RMS RES= 0.45 SEC, GAP= 131 DEG, ERH= 1.3 KM, ERZ= 2.1 KM STA PHASE TIME DIST (KM) AZ (DEG) RES (SEC) RMG P 18-03-40.5 28.4 156 0.33 S -43.5 -0.40 HGA P -44.0 50.9 227 0.11 S -47.6 -2.76X OCA P -51.1 91.5 273 0.49 S -04-01.5 -0.49 HVA S -13.9 136.1 243 -0.20 HPK IP -05.5 206.8 43 -2.93X ES -28.9 -3.95X TKL IP -06.6 193.9 51 0.15 IS -28.7 -0.72 PWLA IP -14.38 244.6 280 0.16 ES -41.56 -1.32X LDV P -17.9 257.8 100 1.86X S -46.5 0.46 AVNC EP -21.10 289.7 66 1.15X ES -55.67 0.39 CH6 P -21.9 278.4 105 3.33X S -49.9 -0.51 NOTE: For additional details refer to - TEIC PRELIMINARY SEISMOLOGICAL BULLETIN, JULY-SEPTEMBER, VOL. II, NO. 5, November, 1981, 37 p. 3 OCTOBER 1981 HILLSBORO, NORTH CAROLINA MLD= 1.1 (VPI) POSSIBLE EARTHQUAKE *VPI LAT= 36.013N LONG= 79.347W H= 09-56-25.4 DPTH= 2.0 KM NO= 18, RMS RES= 0.52 SEC, GAP= 254 DEG, ERH= 4.6 KM, ERZ= 5.8 KM, Q= D. STA PHASE TIME DIST (KM) AZ (DEG) RES (SEC) FRV P 09-56-51.00 158.9 34 -0.67 S -57-11.20 0.59 BLA P -56-53.00 164.0 324 0.55 S -57-14.30 2.35X PUV EP -56-54.00 172.9 310 0.19 S -57-13.60 -0.69 NAV IPC -56-56.50 193.9 318 -0.53 S -57-19.25 -0.58 PBV EP -56-56.80 195.0 57 -0.41 S -57-20.00 -0.13 PWV EP -00.30 211.3 314 0.61 S -24.50 0.10 HWV IPC -00.70 220.0 323 -0.33 S -26.90 0.19 GHV IP -02.60 226.5 29 0.58 S -28.60 0.20 NA12 EP -09.80 254.7 31 3.46X S -36.50 0.66 NA2 EP -09.60 274.4 31 0.83 S -39.20 -0.81 12 NOVEMBER 1981 NARROWS, VIRGINIA MLD= 0.7 (VPI) *VPI LAT= 37.235N LONG= 80.750W H= 06-24-10.0 DPTH= 9.2 KM NO= 6, RMS RES= 0.16 SEC, GAP= 223 DEG, ERH= 3.9 KM, ERZ= 10.7 KM, Q= D; HYPOELLIPSE SEMI-AXES (LENGTH IN KM, AZIMUTH IN DEG): HORIZONTALS ARE 1.8, 23; 3.9, -67 AND THE VERTICAL IS 10.7 KM. QUALITY= D. STA PHASE TIME DIST (KM) AZ (DEG) RES (SEC) NAV IPC 06-24-16.3 9.8 337 -0.14 S -18.1 0.11 PUV S -21.4 24.2 194 -0.06 BLA S -22.7 29.4 95 -0.11 MSH P -20.5 33.7 113 0.41 PMW S -26.1 41.6 43 -0.04 23 NOVEMBER 1981 STAUNTON, VIRGINIA MLD= 2.1 (VPI) *VPI LAT= 38.241N LONG= 79.047W H= 13-14-51.0 DPTH= 9.8 KM NO= 23, RMS RES= 0.27 SEC, GAP= 175 DEG, ERH= 1.6 KM, ERZ= 1.4 KM, Q= C; HYPOELLIPSE SEMI-AXES (LENGTH IN KM, AZIMUTH IN DEG): HORIZONTALS ARE 0.6,-88; 1.6, 2 AND THE VERTICAL IS 1.4 KM. QUALITY= B. Felt (III) in Staunton, Virginia, and vicinity: Houses shook, windows and pictures rattled; noises either like blast/sonic boom "but different" or like low rumble/muffled explosion. STA PHASE TIME DIST (KM) AZ (DEG) RES (SEC) BV1 IP 13-14-59.3 49.9 262 -0.11 S -15-05.4 -0.23 BV3 IPC -00.8 58.7 270 -0.02 S -07.0 -1.02X CVL IPC -01.4 62.8 117 -0.02 S -08.9 -0.15 BV4 P -02.2 65.2 281 0.31 S -09.8 -0.07 GHV P -07.6 100.1 120 0.12 S -19.4 -0.14 FTV P -09.7 106.6 49 1.13X S -21.3 -0.12 NA12 EP -09.9 110.5 105 0.76 S -24.5 2.09X NA2 EP -10.2 118.9 96 -0.22 S -24.3 -0.33 NA5 EP -11.8 121.5 103 1.00X S -26.0 0.67 NA11 EP -12.0 127.1 103 0.32 S -28.0 1.19X FRV IPD -12.8 132.3 151 0.30 S -30.8 2.57X BLA P -17.8 163.4 226 0.63 S -35.4 -0.90X HWV P -18.9 169.6 245 0.99X S -37.2 -0.38 MSH EP -18.6 169.9 223 0.62 S -37.2 -0.49 NAV P -19.8 181.4 235 0.44 S -40.2 0.11 PBV P -22.5 196.6 135 1.37X S -46.0 2.84X PWV P -23.6 199.2 240 2.02X S -44.7 0.77 PUV EP -23.0 203.3 228 0.95X S -44.7 -0.04 25 NOVEMBER 1981 SPRING HILL, TENNESSEE MAG= 2.7 (TEIC), 2.0 (GIT) *TEIC LAT= 35.64N LONG= 84.63W H= 11-54-26.0 DPTH= 8.6 KM NO= 27, RMS RES= 0.39 SEC, GAP= 53 DEG, ERH= 0.7 KM, ERZ= 1.0 KM STA PHASE TIME DIST (KM) AZ (DEG) RES (SEC) BHT IP 11-54-32.71 36.8 309 0.21 IS -37.59 0.33 ORT IP -33.4 42.6 44 -0.05 TKL IP -39.2 77.8 88 -0.06 IS -49.3 0.35 RCG IP -42.38 97.9 221 -0.07 IS -54.68 0.20 CGR P -44.0 108.4 177 -0.06 S -57.2 -0.07 CGTN IP -46.81 131.9 38 -0.86 IS -55-03.70 0.18 AVNC IP -54-56.70 190.4 90 0.08 IS -55-19.36 0.34 OCA P -54-57.0 199.5 235 -1.01X S -55-21.3 -0.14 BEV P -04.0 244.0 134 -0.83 S -34.5 1.25X LK6 P -04.25 254.9 356 -1.98X S -34.55 -1.12X HVA P -07.0 264.2 227 -0.36 S -39.5 1.87X TDA P -07.4 264.9 208 -0.05 S -38.4 0.62 EP1 P -08.8 269.2 133 0.83 S -37.5 -1.18X PRM P -06.0 269.6 129 -2.02X REG P -07.9 270.7 153 -0.25 S -40.5 1.50X OWV P -10.65 294.4 14 -0.40 S -43.95 -0.07 SHBG P -10.65 294.4 12 -0.41 S -44.15 0.12 CH5 P -09.4 299.5 134 -2.28X S -43.9 -1.20X PWLA EP -14.2 320.4 256 0.18 ES -48.5 -0.47 BKA S -56-15.0 377.9 234 NAV EP -55-23.2 391.5 61 0.27 ES -59.7 -4.89X NOTE: For additional details refer to: TEIC PRELIMINARY SEISMOLOGICAL BULLETIN, OCTOBER-DECEMBER, VOL. II, NO. 6, March, 1982, 34 p. *GIT LAT= 35.626N LONG= 84.653W H= 11-54-24.0 DPTH= 0.0 KM, FXD STA PHASE TIME STA PHASE TIME CRG PN 11-54-44.0 EP1 PLG 11-55-08.8 SLG -57.2 SLG -37.5 OCA PLG -57.0 PWL SLG -49.1 SLG -55-21.3 TDA PLG -07.4 HVA PLG -07.0 SLG -38.4 SLG -39.5 TKL PLG -54-39.8 REG PLG -07.9 SLG -49.3 SLG -40.5 AVN PLG -56.7 BEV PLG -04.0 SLG -55-19.4 SLG -34.5 PWL PLG -17.6 29 NOVEMBER 1981 UNION, SOUTH CAROLINA MAG= 1.5 (GIT) *GIT LAT= 34.656N LONG= 81.581W H= 12-03-08.2 DPTH= 0.0 KM, FXD STA PHASE TIME STA PHASE TIME REG SLG 12-04-08.1 EP1 PLG 12-03-27.5 CH5 PLG -03-29.8 SLG -42.2 SLG -43.7 IVA PLG -26.9 CH6 SLG -43.9 SLG -41.9 BEV PLG -28.1 AVN PLG -31.5 SLG -44.3 SLG -49.6 29 NOVEMBER 1981 UNION, SOUTH CAROLINA MAG= 1.5 (GIT) *GIT LAT= 34.641N LONG= 81.553W H= 20-39-40.0 DPTH= 0.0 KM, FXD STA PHASE TIME STA PHASE TIME BEV PLG 20-40-00.5 CH5 PLG 20-40-00.5 SLG -15.1 SLG -16.3 IVA PLG -39-59.0 AVN PLG -04.2 SLG -40-14.5 SLG -22.5 EP1 PLG -39-59.8 SLG -40-14.3 30 NOVEMBER 1981 EASTERN KENTUCKY MLD= 2.5 (TEIC) *TEIC LAT= 37.63N LONG= 82.20W H= 17-33-11.0 DPTH= 6.7 KM NO= 15, RMS RES= 0.45 SEC, GAP= 204 DEG, ERH= 1.8 KM, ERZ= 3.2 KM STA PHASE TIME DIST (KM) AZ(DEG) RES(SEC) PWV EP 17-33-29.4 106.7 108 0.45 ES -42.3 0.24 HWV P -30.6 119.7 92 -0.34 NAV IP -33.7 129.0 105 1.35X IS -47.9 -0.07 PUV P -33.8 139.7 118 -0.19 S -51.2 0.40 BLA EP -38.0 164.0 106 0.29 ES -58.2 0.95X CGTN EP -40.23 180.0 228 0.07 IS -34-12.14 0.65 BV3 EP -33-44.5 223.8 72 -2.38X ES -34-12.6 -0.52 AVNC IP -33-46.28 225.0 187 -0.79 IS -34-12.88 -0.55 HPK P -33-49.7 241.8 218 0.07 S -34-15.4 -2.49X TKL EP -33-52.2 260.7 212 0.03 ES -34-20.8 -1.49X LG -23.5 ETT IP -20.31 326.4 218 2.11X ES -35-35.58 -0.62 CVL S -34-40.5 331.2 83 3.29X FRV ES -43.6 343.0 98 3.88X GHV EP -08.1 361.0 87 3.67X ES -48.6 5.08X RCG EP -12.98 408.9 223 2.70X ES -04.67 11.01X NOTE: For additional details refer to: TEIC PRELIMINARY SEISMOLOGICAL BULLETIN, OCTOBER-DECEMBER, VOL. II, NO. 6, March, 1982, 34 p. 2 DECEMBER 1981 NORTHEAST ALABAMA MLD= 2.0 (TEIC) *TEIC LAT= 34.49N LONG= 86.01W H= 00-34-43.8 DPTH= 10 KM, FXD NO= 10, RMS RES= 0.68 SEC, GAP= 113 DEG, ERH= 2.7 KM, ERZ= 4.9 KM STA PHASE TIME DIST (KM) AZ(DEG) RES(SEC) OCA P 00-34-52.0 41.4 289 0.92 S -57.7 1.29X TDA P -35-02.5 104.9 180 1.26X S -21.6 7.61X ETT EP? -10.78 169.9 56 -0.42 IS -31.71 0.47 TSA P -11.0 170.8 214 -0.33 S -37.0 5.53X CRG P -06.0 179.3 83 -6.63X S -21.0 X PWLA IP -15.02 195.9 286 -0.15 IS -37.91 -0.21 BKA P -16.9 204.1 242 0.47 S -45.0 4.69X TKL IP -17.0 241.8 57 -5.21X IS -50.9 0.58 CGTN IP -30.77 310.3 42 -1.93X IS -36-07.98 -0.49 NOTE: For additional details refer to: TEIC PRELIMINARY SEISMOLOGICAL BULLETIN, OCTOBER-DECEMBER, VOL. II, NO. 6, March, 1982, 34 p. 4 DECEMBER 1981 ANDREWS, NORTH CAROLINA MLD= 1.5 (TEIC) *TEIC LAT= 35.18N LONG= 84.09W H= 04-46-21.4 DPTH= 5 KM, FXD NO= 8, RMS RES= 0.61 SEC, GAP= 118 DEG, ERH= 1.7 KM, ERZ= 4.8 KM STA PHASE TIME DIST (KM) AZ(DEG) RES(SEC) ETT EP 04-46-27.29 36.5 295 -0.56 ES -33.04 0.46 CGR P -34.7 58.4 177 3.26X S -47.1 8.26X TKL IP -27.8 60.0 28 -3.94X IS -33.4 -5.90X AVNC EP -46.78 150.0 71 0.71 ES -47-02.36 -1.77X CGTN EP -46-48.04 156.3 12 1.01X ES -47-05.36 -0.43 IVA P -46-47.0 159.6 129 -0.53 S -47-05.3 -1.36X BEV P -46-48.3 174.1 134 -1.46X S -47-11.0 0.49 REG ES -19.0 205.4 160 0.18 CH5 ES -24.6 229.5 134 -0.62 NOTE: For additional details refer to: TEIC PRELIMINARY SEISMOLOGICAL BULLETIN, OCTOBER-DECEMBER, VOL. II, NO. 6, March, 1982, 34 p. *GIT LAT= 35.232N LONG= 83.999W H= 04-46-20.8 DPTH= 0.0 KM, FXD STA PHASE TIME STA PHASE TIME GRG PLG 04-46-34.7 ETT PLG 04-46-27.76 SLG -47.1 SLG -33.04 IVA PLG -47.0 AVN PLG -46.78 SLG -47-05.3 SLG -47-02.36 BEV PLG -46-48.3 CGT PLG -46-48.04 SLG -47-11.1 SLG -47-05.78 REG SLG -19.1 TKL PLG -46-27.60 CH5 SLG -24.6 SLG -33.30 4 DECEMBER 1981 PULASKI, VIRGINIA MLD= 2.0 (VPI) *VPI LAT= 37.000N LONG= 80.746W H= 02-35-56.4 DPTH= 3.5 KM NO= 21, RMS RES= 0.37 SEC, GAP= 157 DEG, ERH= 1.9 KM, ERZ= 2.5 KM, Q= C; HYPOELLIPSE SEMI-AXES (LENGTH IN KM, AZIMUTH IN DEG): HORIZONTALS ARE 1.2,-110; 1.9,-20 AND THE VERTICAL IS 2.4 KM. QUALITY= A. STA PHASE TIME DIST (KM) AZ (DEG) RES (SEC) PUV IP 02-35-58.2 6.7 293 0.39 MSH P -36-02.5 33.2 67 0.12 S -07.2 0.62X NAV EP -02.5 35.3 353 -0.24 S -07.0 -0.19 BLA IPD -03.1 37.3 51 0.00 S -09.6 1.80X PWV P -04.0 45.9 324 -0.57 S -l0.0 -0.30 HWV P -07.8 66.1 353 -0.03 BV3 IPD -23.6 162.4 32 0.42 S -43.4 1.46X BV4 IPC -24.7 171.1 28 0.19 S -44.8 0.60 FRV IPC -30.8 213.4 84 -0.12 S -55.2 0.11 AVNC IP -30.6 221.4 226 -1.63X S -57.4 0.07 CVL P -32.8 229.6 62 -0.59 S -37-00.4 1.10X GHV IPD -36-36.2 249.7 69 -0.27 S -37-06.0 1.47X CGTN P -36-38.1 268.5 43 -0.88 S -37-08.9 0.10 NA12 EP -36-39.7 276.0 67 -0.10 S -37-12.0 1.81X PBV EP -36-39.7 286.2 90 -1.34X S -37-11.6 -0.70 IVA EP -36-47.2 352.8 211 -1.99X S -37-25.0 -1.16X BEV EP -36-54.5 369.9 209 3.22X S -37-34.5 4.79X ETT EP -36-53.0 381.8 241 0.69 S -37-31.7 -0.61 CH5 P -04.2 389.3 201 10.55X S -32.5 -1.24X CRG EP -04.5 433.0 233 5.46X S -48.0 5.10X REG EP -01.9 459.8 211 59.62X RCG EP -07.1 471.6 242 3.29X -52.2 1.19X 7 DECEMBER 1981 COAL MINE EXPLOSION NEAR TOPMOST, KENTUCKY *VPI LAT= 37.277N LONG= 82.905W H= 20-01-10.6 DPTH= 1.1 KM NO= 10, RMS RES= 0.15 SEC, GAP= 220 DEG, ERH= 4.3 KM, ERZ= 6.6 KM, Q= D; HYPOELLIPSE SEMI-AXES (LENGTH IN KM, AZIMUTH IN DEG): HORIZONTALS ARE 1.0,-119; 4.2,-29 AND THE VERTICAL IS 6.6 KM. QUALITY= C. Eight miners killed according to the ROANOKE TIMES AND WORLD NEWS, December 8 and 11, 1981. The location given above is approximately 25 km southwest of the mine site. STA PHASE TIME DIST (KM) AZ (DEG) RES (SEC) CGTN P 20-01-30.0 104.9 223 1.36X S -44.7 3.03X PWV P -37.8 164.7 88 -0.12 S -02-11.1 3.47X HWV P -01-41.0 186.0 79 -0.16 S -02-13.6 0.41 AVNC P -01-41.2 186.4 170 -0.07 S -02-16.3 2.92X NAV P -01-41.5 187.2 89 0.15 S -02-13.3 -0.22 PUV P -01-41.6 187.6 99 0.19 S -02-14.7 1.08X ORT P -01-42.9 196.8 220 0.12 S -02-19.0 3.02X BLA P -01-46.4 220.7 92 -0.08 ETT P -52.0 257.4 213 -0.08 S -02-24.2 2.23X 9 DECEMBER 1981 TANNEHILL STATE PARK, ALABAMA MAG= 2.6 (TEIC), 1.8 (GIT) *TEIC LAT= 33.24N LONG= 87.02W H= 03-29-34.5 DPTH= 3 KM, FXD NO= 11, RMS RES= 0.46 SEC, GAP= 166 DEG, ERH= 1.4 KM, ERZ= 3.3 KM STA PHASE TIME DIST (KM) AZ(DEG) RES(SEC) TSA PG 03-29-37.5 4.9 247 1.96X S -38.5 2.22X MLA P -50.0 86.9 226 0.58 S -30-00.3 -0.04 HVA P -29-50.6 90.1 15 0.64 S -30-01.5 0.23 TDA P -29-51.2 98.3 70 -0.11 S -30-04.8 1.20X BKA P -29-51.2 98.4 296 -0.12 S -30-02.4 -1.23X OCA P -02.8 161.4 19 1.69X S -21.3 0.73 PWLA IP -09.5 215.4 333 -0.33 IS -34.69 -0.22 RCG IP -15.67 246.4 38 1.55X IS -44.83 1.72X CRG P -19.5 314.8 60 -5.09X S -51.9 -9.35X ETT EP -26.41 330.4 45 -0.58 ES -31-05.09 -0.30 NOTE: For additional details refer to: TEIC PRELIMINARY SEISMOLOGICAL BULLETIN, OCTOBER-DECEMBER, VOL. II, NO. 6, March, 1982, 34 p. *GIT LAT= 33.273N LONG= 87.051W H= 03-29-35.3 DPTH= 10.1 KM STA PHASE TIME STA PHASE TIME TSA PG 03-29-37.5 OCA PLG 03-30-02.8 S -38.5 SLG -21.3 MLA PLG -50.0 CRG PLG -19.5 SLG -30-01.3 SLG -52.9 HVA PLG -29-50.6 TDA PLG -29-52.1 SLG -30-01.5 SLG -30-04.8 BKA PLG -29-51.2 SLG -30-02.4 13 DECEMBER 1981 NORTHWEST GEORGIA MLD= 0.8 (GIT, TEIC) *TEIC LAT= 34.96N LONG= 85.27W H= 09-42-31.3 DPTH= 31.9 KM NO= 7, RMS RES= 1.27 SEC, GAP= 209 DEG, ERH= 8.7 KM, ERZ= 4.0 KM ***NOTE-THIS IS A PROVISIONAL HYPOCENTER FOR INFORMATIONAL PURPOSES ONLY*** STA PHASE TIME DIST (KM) AZ(DEG) RES(SEC) RCG IP 09-42-37.44 7.3 280 0.89 IS -39.62 -0.79 CRG EP -44.80 71.7 118 0.97 ES -51.90 -1.11 ETT EP -46.50 84.4 61 0.82 ES -55.23 -0.98 PWLA EP -43-08.50 255.3 270 -0.78X IS -36.04 -1.05 *GIT RECORDED ONLY AT STATION CRG WITH THE ARRIVAL TIMES/MAGNITUDE LISTED ABOVE 18 DECEMBER 1981 SOUTHEAST TENNESSEE MLD= 1.3 (TEIC) *TEIC LAT= 35.11N LONG= 84.58W H= 13-19-05.3 DPTH= 15 KM, FXD NO= 4, RMS RES= 0.29 SEC, GAP= 207 DEG, ERH= 7.4 KM, ERZ= 11.6 KM STA PHASE TIME DIST (KM) AZ(DEG) RES(SEC) ETT IP 13-19-10.68 26.3 25 0.25 IS -14.04 -0.15 RCG EP? -14.93 71.8 257 -2.44X ES? -26.04 -0.16 TKL EP -20.7 95.0 50 -0.22 ES -31.0 -1.35X CGTN ES? -58.14 178.6 26 3.61X PWLA ES? -20-14.6 318.3 267 NOTE: For additional details refer to: TEIC PRELIMINARY SEISMOLOGICAL BULLETIN, OCTOBER-DECEMBER, VOL. II, NO. 6, March, 1982, 34 p. 23 DECEMBER 1981 NORTHEAST ALABAMA MLD= 1.5 (TEIC) *TEIC LAT= 34.81N LONG= 85.82W H= 16-10-12.4 DPTH= 7.4 KM NO= 7, RMS RES= 0.01 SEC, GAP= 176 DEG, ERH= 0.2 KM, ERZ= 0.2 KM STA PHASE TIME DIST (KM) AZ(DEG) RES(SEC) RCG IP 16-10-20.0 46.4 66 -0.01 IS -26.3 -0.01 OCA P -22.8 60.8 249 0.01 S -30.4 -0.03 ETT EP -34.8 136.6 65 0.00 ES -51.2 -0.03 TSA S -11-10.0 207.6 213 -0.07 NOTE: For additional details refer to: TEIC PRELIMINARY SEISMOLOGICAL BULLETIN, OCTOBER-DECEMBER, VOL. II, NO. 6, March, 1982, 34 p. 25 DECEMBER 1981 MARYVILLE, TENNESSEE MLD= 1.7 (TEIC) *TEIC LAT= 35.46N LONG= 84.17W H= 16-03-31.3 DPTH= 7 KM, FXD NO= 13, RMS RES= 0.15 SEC, GAP= 135 DEG, ERH= 0.6 KM, ERZ= 0.9 KM STA PHASE TIME DIST (KM) AZ(DEG) RES(SEC) ETT IP 16-03-36.8 30.0 241 0.20 IS -40.4 -0.11 TKL IP -38.6 42.0 57 0.02 IS -44.0 0.06 HPK IP -41.3 58.3 26 0.03 IS -48.3 -0.30 CRG P -47.4 96.1 203 -0.13 S -59.2 -0.23 RCG IP -51.3 120.2 243 0.08 ES -04-05.8 -0.02 CGTN EP -03-52.7 129.0 18 0.13 IS -04-08.2 0.03 AVNC IP -03-55.7 149.4 82 0.01 ES -04-13.6 0.03 NOTE: For additional details refer to: TEIC PRELIMINARY SEISMOLOGICAL BULLETIN, OCTOBER-DECEMBER, VOL. II, NO. 6, March, 1982, 34 p. *GIT LAT= 35.462N LONG= 84.127W H= 16-03-30.3 DPTH= 0.0 KM, FXD STA PHASE TIME STA PHASE TIME CRG PLG 16-03-46.9 BEV SLG 16-04-28.0 SLG -59.0 LDV SLG -26.3 EP1 SLG -04-33.0 REG PLG -09.8 CH5 SLG -42.0 SLG -37.8 31 DECEMBER 1981 SOUTHEAST KENTUCKY MLD= 1.7 (TEIC) *TEIC LAT= 37.07N LONG= 84.00W H= 13-15-29.6 DPTH= 5 KM, FXD NO= 7, RMS RES= 0.60 SEC, GAP= 249 DEG, ERH= 10.7 KM, ERZ= 16.9 KM STA PHASE TIME DIST (KM) AZ(DEG) RES(SEC) CGTN EP 13-15-48.51 112.5 120 -0.04 IS -16-02.56 0.15 TKL IP -15-58.5 181.4 149 -0.61 ES -16-20.8 0.12 ETT IP -01.32 195.5 170 0.05 ES -22.41 -2.02X RCG EP -08.39 237.1 191 0.75 ES -34.7 -0.76 NOTE: For additional details refer to: TEIC PRELIMINARY SEISMOLOGICAL BULLETIN, OCTOBER-DECEMBER, VOL. II, NO. 6, March, 1982, 34 p. Following is a listing of South Carolina earthquakes from July-December, 1981, recorded by the U. S. Geological Survey network in that state. These events were located using HYPO71 and many of them occur near reservoirs. Some may be blasts. A full report will be issued by the U. S. Geological Survey at a later date. ORIGIN TIME LAT LONG ERH DPTH ERZ RMS (MO-DY-HR-MN-SEC) (N DEG) (W DEG) (KM) (KM) (KM) MLD (SEC) Q 08 15 16 38 25.42 33.895 81.554 5.5 .9 0.00 C 08 28 20 41 52.35 34.025 82.428 .5 .4 .2 1.6 .07 C 09 02 16 08 56.05 33.689 82.106 17.5 3.1 17.4 2.1 .94 D 09 09 19 30 45.32 34.281 81.570 5.0 2.1 2.09 D 09 12 19 34 45.38 33.973 82.607 1.3 1.1 .5 2.2 .05 C 09 14 20 43 25.03 34.281 81.260 5.0 1.8 2.14 D 09 15 17 56 43.91 34.443 81.258 16.7 15.5 9.9 1.7 .14 D 10 13 22 19 56.49 33.552 82.248 3.9 1.2 7.5 2.0 .35 D 11 02 19 02 33.78 34.719 82.392 2.1 1.2 .8 1.9 .04 C 11 12 20 35 9.23 33.797 82.169 5.0 1.9 .98 D The following are unlocatable events recorded at the station indicated: MO-DY-HR-MN-SEC STA SEC SEC 07 08 02 23 MGS EP 16.2 ES 16.8 SVS EP 16.3 ES 17.3 07 23 08 45 55.7 DH2 07 26 23 29 DH3 EP 20.0 ES 22.5 08 01 10 49 41.4 DH1 08 01 10 52 1.6 DH1 08 09 20 58 7.7 SVS 08 28 16 55 DH3 EP 54.0 ES 54.5 09 03 13 23 8.4 PRM 09 14 21 01 22.5 PRM 09 18 22 23 24.2 PRM 09 23 19 44 39.3 PRM 09 24 14 54 25.4 PRM 10 13 20 08 17.6 PRM 10 21 05 37 27.0 DH3 10 21 21 46 38.0 PRM 11 04 12 31 00.7 DH1 11 20 22 55 46.1 PRM 11 22 15 57 CCS EP 02.3 ES 05.1 11 24 18 41 06.5 PRM 12 02 18 37 20.2 ZIN 12 08 19 41 15.0 PRM 12 09 09 43 08.5 CCS 12 09 22 34 17.5 PRM 12 11 18 53 56.7 PRM 12 13 22 48 58.5 DH3 12 29 22 46 25.0 PRM ACKNOWLEDGMENTS In addition to the support furnished by the host institutions of the network members, partial or full support by other agencies for the operation of portions of the SEUSSN is gratefully acknowledged. The agencies providing support to the members of SEUSSN are as follows: The National Science Foundation - Geophysics Program, The Nuclear Regulatory Commission - Office of Reactor Safety Research, The United States Geological Survey - Office of Earthquake Studies, The Georgia Power Company, The Virginia Electric and Power Company.