SOUTHERN CALIFORNIA SEISMOGRAPHIC NETWORK A Cooperative Project of Caltech and the U.S. Geological Survey October 12, 1995 Weekly Earthquake Report for Southern California ------------------------------------------------ October 5 - 11, 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, October 5, Pacific Daylight Time, to midnight Wednesday night, October 11, 1995, Pacific Daylight Time. We recorded 896 earthquakes during the 7-day period covered. Most of the activity this week, again, consisted of small Ridgecrest aftershocks. One of the week's two largest events, a M3.7 just after noon on Friday, was a Ridgecrest quake. The week's most widely felt event was also a M3.7, but it was an aftershock of th Northridge quake (January 17, 1994 Mw6.7). It occurred on last Thursday morning, near Simi Valley. All of the other M3+ events were Ridgecrest quakes, except for a M3.5 near Ocotillo Wells on Wednesday morning. This one was in the complex and active San Jacinto fault zone. 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 ------------------------------------------------------------- 10/5 1:25 am 35 44.5 117 37.9 2.1 8 mi. NNE of Ridgecrest 10/5 2:07 am 34 58.6 116 58.0 2.8 6 mi. NNE of Barstow 10/5 2:10 am 35 45.6 117 38.5 2.1 9 mi. N of Ridgecrest 10/5 6:35 am 33 53.9 118 39.2 2.0 9 mi. S of Malibu 10/5 7:03 am 33 57.4 116 56.9 2.0 2 mi. NE of Beaumont 10/5 9:42 am 34 14.6 118 40.8 3.7 2 mi. SSE of Simi Valley FELT 10/5 11:25 am 34 16.7 118 26.3 2.1 Under Pacoima 10/5 11:33 am 32 59.9 116 22.8 2.4 13 mi. ESE of Julian 10/5 1:44 pm 35 43.6 117 37.9 2.5 7 mi. NNE of Ridgecrest 10/5 8:25 pm 34 14.4 118 40.9 2.1 3 mi. SSE of Simi Valley 10/6 1:40 am 35 46.1 117 37.7 3.1 10 mi. NNE of Ridgecrest 10/6 3:13 am 35 47.1 117 39.3 2.0 11 mi. N of Ridgecrest 10/6 5:24 am 35 47.4 117 39.9 3.1 " 10/6 7:03 am 33 39.9 116 46.9 2.0 6 mi. SW of Idyllwild 10/6 10:17 am 35 44.6 117 38.3 3.4 8 mi. N of Ridgecrest 10/6 10:44 am 35 45.5 117 38.3 3.4 9 mi. N of Ridgecrest 10/6 12:12 pm 35 54.8 117 55.4 2.4 9 mi. S of Coso Junction 10/6 12:15 pm 35 45.5 117 38.2 3.7 9 mi. N of Ridgecrest 10/6 1:19 pm 35 45.6 117 38.2 2.0 " 10/6 5:17 pm 33 51.3 118 37.7 2.7 12 mi. SSE of Malibu 10/6 7:29 pm 34 21.0 116 27.5 2.1 16 mi. N of Yucca Valley 10/7 1:00 am 35 44.2 117 37.6 2.3 8 mi. NNE of Ridgecrest 10/7 1:02 am 35 48.2 117 37.8 2.0 12 mi. N of Ridgecrest 10/7 1:59 am 34 56.4 116 53.1 2.0 8 mi. ENE of Barstow 10/7 12:18 pm 35 45.5 117 38.1 2.0 9 mi. N of Ridgecrest 10/7 12:26 pm 35 46.0 117 37.8 3.4 10 mi. NNE of Ridgecrest 10/7 12:50 pm 35 45.5 117 38.2 2.2 9 mi. N of Ridgecrest 10/7 6:52 pm 35 45.8 117 37.7 2.2 10 mi. NNE of Ridgecrest 10/7 10:49 pm 36 16.0 120 22.9 2.6 8 mi. N of Coalinga 10/7 10:57 pm 33 16.8 116 26.0 2.3 3 mi. WNW of Borrego Springs 10/7 11:03 pm 36 15.2 120 21.0 2.6 7 mi. N of Coalinga 10/8 1:07 am 35 12.2 118 39.6 2.0 9 mi. E of Arvin 10/8 1:18 am 35 45.7 117 38.1 2.1 9 mi. N of Ridgecrest 10/8 4:28 am 35 46.4 117 39.4 2.2 10 mi. N of Ridgecrest 10/8 5:18 am 34 9.7 116 50.3 2.4 4 mi. N of Mt. San Gorgonio 10/8 6:51 am 35 44.2 117 37.6 2.7 8 mi. NNE of Ridgecrest 10/8 7:32 am 35 45.9 117 37.7 2.1 10 mi. NNE of Ridgecrest 10/8 9:22 am 35 45.6 117 38.2 2.0 9 mi. N of Ridgecrest 10/8 9:29 am 35 45.7 117 37.9 2.7 9 mi. NNE of Ridgecrest 10/8 9:43 am 35 45.8 117 38.1 3.1 9 mi. N of Ridgecrest 10/8 6:05 pm 35 45.5 117 38.1 2.0 " 10/8 10:47 pm 34 13.8 116 45.3 2.1 6 mi. ESE of Big Bear City 10/9 1:55 am 35 46.5 117 38.1 2.5 10 mi. N of Ridgecrest 10/9 4:16 am 35 45.5 117 38.1 2.6 9 mi. N of Ridgecrest 10/9 7:24 am 34 38.1 116 39.0 2.3 21 mi. NE of Lucerne Valley 10/9 12:24 pm 34 2.0 117 15.6 2.1 1 mi. SSW of Loma Linda 10/9 4:32 pm 35 46.7 117 39.7 2.7 10 mi. N of Ridgecrest 10/9 9:13 pm 35 45.0 117 38.4 2.8 9 mi. N of Ridgecrest 10/10 2:31 am 35 45.8 117 37.4 2.0 10 mi. NNE of Ridgecrest 10/10 6:47 am 33 9.8 115 39.1 2.1 1 mi. WSW of Obsidian Butte 10/10 2:07 pm 34 22.4 116 26.8 2.4 17 mi. N of Yucca Valley 10/10 9:11 pm 34 28.1 117 58.3 2.0 11 mi. SE of Palmdale 10/10 11:50 pm 34 55.7 116 55.1 2.4 6 mi. ENE of Barstow 10/11 1:06 am 35 46.2 117 39.3 2.1 10 mi. N of Ridgecrest 10/11 3:23 am 35 47.0 117 37.8 2.4 11 mi. N of Ridgecrest 10/11 3:59 am 35 44.7 117 37.3 2.1 8 mi. NNE of Ridgecrest 10/11 7:45 am 35 47.9 117 38.0 3.5 12 mi. N of Ridgecrest 10/11 9:53 am 36 3.1 117 43.0 2.2 12 mi. E of Coso Junction 10/11 10:37 am 33 14.8 116 7.7 3.5 7 mi. N of Ocotillo Wells 10/11 5:25 pm 34 15.1 118 28.2 2.0 2 mi. SE of Granada Hills 10/11 10:51 pm 33 9.9 116 6.2 2.1 2 mi. NE of Ocotillo Wells 10/11 11:13 pm 35 45.1 117 38.8 2.0 9 mi. N of Ridgecrest -------------------------------------------------------------