SOUTHERN CALIFORNIA SEISMOGRAPHIC NETWORK A Cooperative Project of Caltech and the U.S. Geological Survey March 28, 1996 Weekly Earthquake Report for Southern California ------------------------------------------------ March 21 - 28, 1996 Prepared by: Debbie Wells, 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, March 21, Universal Time (ie. GMT), to midnight Wednesday night, March 27, Universal Time. In local time, the period of coverage is from 4 p.m., March 20 to 4 p.m., March 27, Pacific Standard Time. We detected and processed 292 earthquakes during the 7-day period covered. Things were very quiet this week. The only quake above M3.0 was also the only one that was felt. It was a M3.2 after- shock of the Northridge earthquake (M6.7, January 17, 1994), located near Chatsworth, on Monday morning. The swarm that began last week near Coso Junction has slowed down substantially, producing nothing above M2.0. 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 ------------------------------------------------------------- 3/20 6:17 pm 34 29.1 116 30.3 2.0 25 mi. N of Yucca Valley 3/21 1:38 am 34 37.0 118 37.4 2.2 6 mi. N of Castaic Lake dam 3/21 2:46 am 34 34.7 116 32.7 2.2 24 mi. ENE of Lucerne Valley 3/21 2:46 am 34 35.0 116 33.3 2.3 " 3/21 3:23 am 34 37.7 116 38.5 2.1 21 mi. NE of Lucerne Valley 3/21 1:22 pm 34 19.0 116 27.9 2.1 13 mi. N of Yucca Valley 3/21 4:35 pm 34 8.9 116 24.5 2.0 2 mi. NE of Yucca Valley 3/21 4:46 pm 36 2.6 120 34.6 2.6 12 mi. NW of Parkfield 3/22 3:29 am 34 0.8 119 9.1 2.0 9 mi. SSE of Port Hueneme 3/22 6:43 am 35 1.4 119 7.6 2.2 10 mi. W of Wheeler Ridge 3/22 7:00 am 34 37.8 116 39.4 2.0 20 mi. NE of Lucerne Valley 3/22 3:47 pm 34 16.8 116 25.3 2.8 11 mi. N of Yucca Valley 3/22 8:46 pm 34 9.9 118 29.2 2.0 Under Encino 3/23 12:21 pm 32 57.6 117 38.6 2.2 22 mi. SW of Oceanside 3/24 9:34 am 35 48.2 118 20.1 2.3 13 mi. NNE of town of Lake Isabella 3/25 1:18 am 36 7.9 120 41.1 2.5 18 mi. W of Coalinga 3/25 5:54 am 34 14.2 118 36.3 3.2 1 mi. S of Chatsworth; FELT 3/25 11:24 am 34 5.8 116 53.9 2.7 4 mi. W of Mt. San Gorgonio 3/26 12:52 am 33 21.3 116 15.9 2.1 9 mi. NE of Borrego Springs 3/26 1:21 am 35 47.4 117 37.6 2.1 11 mi. N of Ridgecrest 3/26 3:10 am 34 24.7 116 29.0 2.1 20 mi. N of Yucca Valley 3/26 8:52 am 35 46.5 117 39.1 2.1 10 mi. N of Ridgecrest 3/26 10:13 am 34 19.7 118 16.5 2.0 5 mi. NNE of Sunland 3/26 12:37 pm 35 5.3 119 2.8 2.2 8 mi. NW of Wheeler Ridge 3/26 6:27 pm 34 36.7 118 37.3 2.5 6 mi. N of Castaic Lake dam 3/27 1:27 am 36 27.3 120 22.8 2.8 21 mi. N of Coalinga 3/27 6:42 am 34 20.0 116 28.8 2.6 15 mi. N of Yucca Valley 3/27 1:24 pm 34 44.9 116 26.4 2.1 35 mi. NE of Lucerne Valley -------------------------------------------------------------