SOUTHERN CALIFORNIA SEISMOGRAPHIC NETWORK A Cooperative Project of Caltech and the U.S. Geological Survey December 7, 1995 Weekly Earthquake Report for Southern California ------------------------------------------------ November 30 - December 6, 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, November 30, Universal Time (ie. GMT), to midnight Wednesday night, December 7, 1995, Universal Time. In local time, the period of coverage is from 4 p.m., November 29 to 4 p.m., December 6 Pacific Standard Time. We detected and processed 514 earthquakes during the 7-day period covered. The total seismicity for the week was very typical of recent weeks. As expected, most of the activity occurred at Ridgecrest, Northridge, and Landers. The largest quake of the week, and the only one actually reported to us as felt, was a Ridgecrest aftershock, M3.7, on Friday afternoon. There were also a M3.5 and a M3.3 at Ridgecrest the day before, but we did not get any inquiries. Another quake that might have caused publid interest, but didn't, was a M3.1 near Borrego Springs early Tuesday morning. The Borrego Springs quake occurred in the complex San Jacinto Fault zone, and had a focal mechanism that was a combination of strike slip and thrust. There was also a M3.2 offshore from Newport Beach early Sunday morning. Because it was offshore, however, it was unlikely to have been noticed. 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 ------------------------------------------------------------- 11/29 9:08 pm 35 0.9 116 57.5 2.2 9 mi. NNE of Barstow 11/30 6:09 am 35 45.1 117 38.1 3.5 9 mi. N of Ridgecrest 11/30 7:06 am 34 16.7 116 50.7 2.0 1 mi. NNE of Big Bear City 11/30 7:59 am 35 44.7 117 38.5 2.0 8 mi. N of Ridgecrest 11/30 9:25 am 34 18.4 116 28.9 2.4 13 mi. N of Yucca Valley 11/30 9:31 am 35 47.1 117 41.1 3.3 11 mi. N of Ridgecrest 11/30 9:56 am 35 47.0 117 40.7 2.1 " 11/30 4:00 pm 33 14.0 116 5.2 2.6 6 mi. NNE of Ocotillo Wells 11/30 5:07 pm 34 7.9 116 58.3 2.0 7 mi. NNE of Yucaipa 12/1 12:31 am 33 56.4 117 49.3 2.0 3 mi. N of Yorba Linda 12/1 10:35 am 35 44.0 117 37.5 2.3 8 mi. NNE of Ridgecrest 12/1 3:14 pm 33 18.8 118 18.7 2.3 2 mi. SSE of Avalon, Catalina Island 12/1 4:29 pm 35 47.0 117 41.2 3.7 11 mi. N of Ridgecrest FELT 12/1 4:30 pm 35 47.2 117 41.2 2.2 " 12/1 7:01 pm 34 36.2 116 36.9 2.2 21 mi. ENE of Lucerne Valley 12/1 8:25 pm 33 5.0 117 50.5 2.0 27 mi. SSW of Dana Point 12/1 9:37 pm 35 1.8 116 59.8 2.0 9 mi. N of Barstow 12/2 1:55 am 33 56.8 116 37.9 2.1 7 mi. SSW of Morongo Valley 12/2 6:52 am 33 20.0 118 0.4 3.2 19 mi. SSW of Newport Beach 12/2 10:00 am 33 19.3 116 24.9 2.1 5 mi. NNW of Borrego Springs 12/2 10:08 am 34 57.8 116 57.3 2.0 6 mi. NE of Barstow 12/2 10:39 am 35 46.7 117 38.9 2.7 10 mi. N of Ridgecrest 12/2 10:53 am 33 48.3 120 5.9 2.3 9 mi. S of Santa Rosa Is. 12/2 8:03 pm 35 46.7 117 39.2 2.5 10 mi. N of Ridgecrest 12/2 10:56 pm 35 46.4 117 39.2 2.2 " 12/3 5:28 am 35 47.1 117 41.4 2.3 " 12/4 3:59 am 35 43.8 117 37.4 2.2 7 mi. NNE of Ridgecrest 12/4 4:56 am 33 51.4 117 49.6 2.2 2 mi. SSW of Yorba Linda 12/4 2:06 pm 34 50.6 118 59.5 2.1 3 mi. WNW of Frazier Park 12/4 5:10 pm 35 46.3 117 38.0 2.8 10 mi. N of Ridgecrest 12/5 12:10 am 35 16.6 118 36.1 2.1 13 mi. NW of Tehachapi 12/5 1:20 am 34 2.0 117 15.7 2.0 1 mi. SSW of Loma Linda 12/5 1:56 am 34 1.6 118 26.5 2.4 2 mi. S of Westwood Village 12/5 7:34 am 33 17.7 116 19.3 3.1 4 mi. NE of Borrego Springs 12/5 4:48 pm 35 58.3 117 51.8 2.5 6 mi. SE of Coso Junction 12/5 5:55 pm 34 28.7 116 29.8 2.2 25 mi. N of Yucca Valley 12/5 6:03 pm 35 45.5 117 38.6 2.0 9 mi. N of Ridgecrest 12/5 6:50 pm 34 16.7 118 27.6 2.1 1 mi. WSW of Pacoima 12/5 9:34 pm 35 21.0 118 34.2 2.7 16 mi. NNW of Tehachapi 12/6 2:31 pm 35 46.8 117 39.1 2.0 11 mi. N of Ridgecrest 12/6 2:34 pm 34 37.1 116 36.4 2.4 22 mi. ENE of Lucerne Valley -------------------------------------------------------------