BULLETIN NO 4 TABLE 2 LIST OF SOUTHEASTERN UNITED STATES EARTHQUAKES LOCATED FOR THE TIME PERIOD 1 JANUARY 1979 THROUGH 30 JUNE 1979 19 JANUARY 1979 SOUTH CAROLINA MBN= 2.9 (BLA) FELT IN NORTHWEST SOUTH CAROLINA *VPI LAT= 34.757N LONG= 82.913W H= 08-55-34.3 DPTH= 0.0, FXD (NO= 8, GAP= 169, RMS= 0.18, ERH= 7.8, ERZ= 12.7, Q= D) STA P TIME S TIME DIST (DEG) AZ RES PRM 08-55-50.26 90.5 146 0.05 ORT 08-56-04.51 179.9 315 -0.07 LHS 08-56-06.93 195.6 99 -0.18 PUV 08-56-22.58 314.9 37 0.12 PWV 08-56-25.10 331.8 30 0.57 NAV 08-56-25.54 342.3 34 -0.26 BLA 08-56-27.53 353.2 40 0.41 HWV 08-56-28.84 365.6 31 0.21 CVL 08-56-50.94 536.3 48 1.54X NA2 08-56-57.58 595.6 51 0.97 NOTE: This event was also located by the USGS. Their location (34.644N-82.843W) is more accurate than that given above. See listing, page 15. NOTE: Additional arrival times from the Georgia Tech Network are as follows: STA PN TIME PLG TIME SLG TIME RMG 08-56-10.4 CH6 08-55-52.0 08-56-03.3 CH5 08-55-55.0 08-56-12.2 PLG and SLG are defined by GIT as the first arriving P and S phases in the distance range 25 km to 160 km. 27 JANUARY 1979 SOUTH CAROLINA MLD= 2.8 *USGS LAT= 33.0507N LONG= 80.1818W H= 23-55-15.65 DPTH= 6.2 KM (NO= 16, GAP= 71, RMS= 0.14, ERH= 0.9, ERZ= 2.3, Q= B) STA P TIME S TIME DIST (KM) AZ RES AIN 23-55-17.24 23-55-19.25 6.5 16 0.10 SVS 23-55-17.79 11.0 215 0.04 BCS 23-55-18.04 12.9 127 0.02 MGS 23-55-18.75 23-55-20.82 17.5 167 0.13 HBF 23-55-18.89 22.5 235 0.13 PBS 23-55-23.15 26.5 343 2.95X CCS 23-55-20.28 23-55-23.50 26.9 195 0.06 PPS 23-55-20.95 23-55-23.91 28.5 152 0.48X SGS 23-55-21.70 34.6 297 0.07 NHS 23-55-22.14 39.8 87 -0.18 BOW 23-55-25.29 56.0 310 0.22 COW 23-55-25.64 60.9 307 -0.14 WMS 23-55-26.76 23-55-35.06 66.7 309 0.18 ROW 23-55-26.57 66.9 301 -0.15 OSB 23-55-29.43 82.7 312 0.06 MTT 23-55-41.50 156.0 300 1.03X LHS 23-55-42.50 168.7 340 0.59 JSC 23-55-42.28 23-56-02.29 168.9 324 0.45X PRM 23-55-49.86 232.6 299 0.28X (X= not used in solution) Following is a listing of earthquake hypocenters (MLD ge 1.5) in the northern portion of South Carolina. These hypocenters were determined by the USGS Branch of Earthquake Tectonics and Risk, Golden, Colorado, using HYPO71 and data from their network. The duration magnitudes were calculated using MLD= -0.87+ 2 Log D+ 0.0035R where R= epicentral distance in km and D is the duration in seconds. In the listing below, the hypocentral parameters and magnitude (MLD= MAG) are given first followed by a separate table for the various solution quality measures. DATE ORIGIN LAT N LONG W DPTH MAG 790105 2019 41.14 34.420 82.544 5.0 2.2 790105 2244 5.26 34.018 82.574 1.3 2.2 790108 104 33.32 34.357 81.323 8.5 2.3 790116 1828 31.50 33.378 82.090 1.7 2.1 790119 855 36.94 34.644 82.843 1.1 3.4 790122 1711 29.63 33.978 81.060 5.0 1.7 790216* 1437 8.40 34.340 81.362 2.7 3.3 790220* 2320 44.43 34.382 81.393 9.2 2.4 790224 931 42.27 34.281 81.293 9.8 2.0 790226 2150 19.56 34.703 82.530 1.0 2.3 790227 2216 43.02 34.060 82.598 1.5 1.7 790227 2243 2.58 33.562 82.562 1.0 1.7 790314 1654 40.03 34.089 82.828 9.3 2.2 790321 2235 18.45 34.026 82.569 1.0 2.1 790322 317 46.09 34.426 81.308 1.0 2.0 790422 204 57.24 34.386 81.305 6.2 2.1 790424 949 55.86 34.324 81.307 6.3 1.6 790501 1824 27.11 34.026 82.588 5.0 1.5 790504 1213 8.92 34.33 81.95 1.2 2.6 790507 1000 17.23 34.498 81.381 5.0 1.7 790611 1621 4.52 34.281 81.260 17.4 1.7 790630 135 8.45 34.337 81.331 8.3 2.3 DATE NO GAP RMS ERH ERZ Q 790105 7 262 2.12 42.6 D 790105 6 195 0.27 0.6 D 790108 10 182 0.85 13.5 D 790116 9 251 0.40 7.8 D 790119 10 295 0.23 2.1 D 790122 7 135 0.33 40.0 C 790216 14 180 0.62 3.2 D 790220 7 243 0.51 5.7 D 790224 6 166 0.13 1.7 C 790226 7 275 0.10 0.9 D 790227 6 269 0.97 32.1 D 790227 6 281 0.13 0.7 D 790314 7 333 0.71 10.5 D 790321 5 168 0.21 9.2 D 790322 6 193 0.38 3.2 D 790422 8 186 0.31 11.0 D 790424 5 175 0.12 4.2 D 790501 5 293 0.90 2.9 D 790504 10 201 0.42 2.6 1.7 D 790507 5 209 0.86 86.5 D 790611 5 164 1.16 0.5 D 790630 6 178 0.25 5.3 C *Also located by USC - see following list. Two of the above events were detected by the Savannah River Laboratory Network. The arrival-times at that network were as follows: DATE STA P TIME S TIME MLD 790108 SRPN 01-24-45.2 01-24-59.5 2.4 SRPW 01-24-48.5 01-25-05.2 SRPD 01-24-49.3 01-25-07.5 790119 SRPN 08-56-06.7 08-56-30.5 3.0 SRPW 08-56-10.0 08-56-33.5 SRPD 08-56-09.5 08-56-34.8 NOTE: MLD= -1.5+ 2 Log D (sec) Following is a listing of earthquake hypocenters (MLD ge 2.0) in the vicinity of Lake Jocassee and Monticello Reservoir, South Carolina. These hypocenters were determined at the University of South Carolina using HYPO71 and data from their portable and semi-permanent seismographs deployed in the epicentral areas. The magnitudes were calculated using: MLD= -1.83+ 2.04 Log D (sec). In the listing, MLD= MAG. DATE ORIGIN LAT N LONG W DPTH MAG 790201 125 48.44 34.330 81.317 1.1 2.6 790216 1437 9.12 34.340 81.338 0.1 2.7 790220 2320 45.55 34.322 81.355 1.9 2.3 790501 2039 59.75 34.937 82.973 1.0 2.4 790528 1145 37.84 34.971 82.943 1.0 2.5 790605 937 44.23 34.310 81.326 1.9 2.4 790605 940 2.10 34.311 81.324 2.8 2.3 DATE NO GAP RMS ERH ERZ Q 790201 5 128 0.02 0.3 1.0 C 790216 5 132 0.02 0.0 0.1 C 790220 5 171 0.07 1.1 6.2 D 790501 3 142 0.00 C 790528 3 188 0.01 C 790605 6 145 0.08 0.7 2.9 C 790605 7 144 0.06 0.4 1.3 B NOTE: Additional arrival times from the Georgia Tech Network for the 790201 event are as follows: STA PN TIME PLG TIME SN TIME SLG TIME GBG 01-26-19.8 01-26-20.95 01-26-41.98 01-26-43.1 REG 01-26-21.8 01-26-23.1 01-26-45.5 01-26-47.4 CH5 01-26-06.9 01-26-07.76 01-26-21.2 WDG (S-P) TIME= 23.8 SEC PLG and SLG are defined by GIT as the first arriving P and S phases in the distance range 25 km to 160 km. NOTE: Additional arrival times from the Savannah River Laboratory Network for the 790201 event are as follows: STA P TIME S TIME MLD SRPN 01-26-07.5 01-26-17.5 2.7 SRPW 01-26-10.3 01-26-25.1 SRPD 01-26-12.0 01-26-28.0 MLD= -1.5+ 2 Log D (sec) ERRATA The 26 April 1978, Berkeley Springs, West Virginia, event (Bulletin No. 2) was a probable blast and not a natural earthquake.