SOUTHERN CALIFORNIA SEISMOGRAPHIC NETWORK A Cooperative Project of Caltech and the U.S. Geological Survey September 14, 1995 Weekly Earthquake Report for Southern California ------------------------------------------------ September 7 - 13, 1995 Prepared by: Kate Hutton, Seismological Laboratory (kate@bombay.gps.caltech.edu) Lucy Jones, U.S. Geological Survey California Institute of Technology For further information, please contact the authors or the Caltech Public Relations Office at 818-395-6326. For daily updates, call our Earthquake Information Hotline: 818-395-6977. -------------------------------- This week's Report covers the time period from midnight Thursday morning, September 7, Pacific Daylight Time, to midnight Wednesday night, September 13, 1995, Pacific Daylight Time. We recorded 534 earthquakes during the 7-day period covered. Ridgecrest aftershocks (of the August 17 ML5.4 quake), along with Landers and Northridge aftershocks, continue to dominate the seismicity. 280 of the week's 534 events were members of the Ridgecrest sequence. The week's largest event was a M4.3 Ridgecrest aftershock, just before noon on Monday. It had a strike-slip focal mechanism, and it was felt in Ridgecrest. The second largest quake of the week was a M3.4 Landers aftershock in the wee hours on Saturday, near the town of Yucca Valley. It was also felt. The table lists the quakes this week that were M2.0 or larger in the central part of the coverage area. Times are local times; if you want Greenwich Mean Time, add 7 hrs to the Pacific Daylight Time or 8 hrs to the Pacific Standard Time listed. Table 1 ------- Date Time N Lat. W Long. Mag ------------------------------------------------------------- 9/7 2:42 am 35 46.4 117 39.1 2.6 10 mi. N of Ridgecrest 9/7 11:09 am 33 18.3 116 19.3 2.2 4 mi. NE of Borrego Springs 9/7 1:54 pm 35 45.8 117 38.4 2.3 9 mi. N of Ridgecrest 9/7 2:30 pm 35 47.2 117 37.8 2.9 11 mi. N of Ridgecrest 9/7 2:42 pm 35 47.6 117 38.1 2.4 " 9/7 5:57 pm 35 40.0 116 18.3 2.2 21 mi. S of Shoshone 9/7 6:30 pm 35 45.6 117 37.9 2.0 9 mi. NNE of Ridgecrest 9/7 8:12 pm 35 13.2 118 36.8 2.2 11 mi. WNW of Tehachapi 9/7 9:06 pm 35 47.9 117 38.5 2.6 12 mi. N of Ridgecrest 9/8 6:21 am 34 1.6 116 23.7 2.1 6 mi. SSE of Yucca Valley 9/8 7:37 am 33 53.8 117 39.7 2.4 5 mi. WNW of Corona 9/8 8:56 am 34 19.7 116 27.8 2.2 14 mi. N of Yucca Valley 9/8 8:57 am 34 28.4 116 28.7 2.0 24 mi. N of Yucca Valley 9/8 2:22 pm 34 20.4 116 28.3 2.0 15 mi. N of Yucca Valley 9/8 8:51 pm 35 46.3 117 38.9 2.0 10 mi. N of Ridgecrest 9/9 12:34 am 35 46.6 117 39.2 2.0 " 9/9 12:35 am 35 46.9 117 39.1 2.0 11 mi. N of Ridgecrest 9/9 1:08 am 34 9.3 116 26.0 3.4 2 mi. NNE of Yucca Valley FELT 9/9 1:33 am 34 18.7 116 26.7 2.1 13 mi. N of Yucca Valley 9/9 1:51 am 33 5.8 116 27.2 2.2 8 mi. E of Julian 9/9 3:05 am 35 46.8 117 39.0 2.0 10 mi. N of Ridgecrest 9/9 8:28 am 35 47.1 117 39.4 2.1 11 mi. N of Ridgecrest 9/9 10:22 am 36 11.6 117 35.7 2.1 12 mi. SW of Panamint Springs 9/9 11:56 am 35 47.8 117 38.5 2.0 12 mi. N of Ridgecrest 9/9 12:15 pm 34 57.8 116 56.6 2.1 6 mi. NE of Barstow 9/9 8:05 pm 35 46.5 117 39.1 2.1 10 mi. N of Ridgecrest 9/9 9:51 pm 34 57.1 116 56.8 2.1 6 mi. NE of Barstow 9/9 10:56 pm 34 9.5 116 26.0 2.2 2 mi. NNE of Yucca Valley 9/10 5:36 am 36 0.6 120 33.9 2.7 10 mi. NW of Parkfield 9/10 5:51 am 35 46.7 117 39.1 2.2 10 mi. N of Ridgecrest 9/10 10:13 am 35 59.8 118 21.2 2.5 25 mi. NNE of town of Lake Isabella 9/10 4:14 pm 34 56.4 116 52.9 2.1 8 mi. ENE of Barstow 9/10 4:22 pm 34 19.6 118 29.2 2.0 3 mi. NNE of Granada Hills 9/10 7:38 pm 36 1.6 120 33.1 2.4 11 mi. NW of Parkfield 9/11 8:12 am 34 9.0 116 25.5 2.3 2 mi. NNE of Yucca Valley 9/11 11:37 am 35 47.3 117 39.8 4.3 11 mi. N of Ridgecrest FELT 9/11 3:51 pm 35 45.9 117 38.6 2.0 10 mi. N of Ridgecrest 9/11 4:46 pm 34 9.1 116 25.4 2.4 2 mi. NNE of Yucca Valley 9/11 6:12 pm 34 17.9 118 27.5 2.1 1 mi. NW of Pacoima 9/11 7:55 pm 35 45.5 117 38.8 2.3 9 mi. N of Ridgecrest 9/11 9:56 pm 35 46.8 117 38.3 2.0 11 mi. N of Ridgecrest 9/12 6:58 am 35 47.8 117 38.0 2.2 12 mi. N of Ridgecrest 9/12 10:38 am 34 21.3 116 27.7 2.0 16 mi. N of Yucca Valley 9/12 11:47 am 33 58.6 117 38.4 2.1 3 mi. SE of Chino 9/12 6:52 pm 34 54.6 116 54.6 2.4 6 mi. ENE of Barstow 9/12 11:46 pm 35 46.4 117 37.5 2.0 10 mi. NNE of Ridgecrest 9/12 11:56 pm 34 14.5 117 5.5 2.1 2 mi. NNE of Running Springs 9/13 7:02 am 35 47.3 117 39.7 2.2 11 mi. N of Ridgecrest 9/13 2:05 pm 33 56.3 116 20.1 2.1 9 mi. E of Desert Hot Springs 9/13 3:11 pm 34 59.7 116 56.7 2.1 8 mi. NNE of Barstow 9/13 6:55 pm 35 46.5 117 40.3 2.1 10 mi. N of Ridgecrest 9/13 8:56 pm 35 45.7 117 38.2 2.2 9 mi. N of Ridgecrest 9/13 9:43 pm 35 45.7 117 38.0 2.0 " -------------------------------------------------------------