SOUTHERN CALIFORNIA SEISMOGRAPHIC NETWORK A Cooperative Project of Caltech and the U.S. Geological Survey March 7, 1996 Weekly Earthquake Report for Southern California ------------------------------------------------ February 29 - March 6, 1996 Prepared by: Nick Scheckel, 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, February 29, Universal Time (ie. GMT), to midnight Wednesday night, March 6, Universal Time. In local time, the period of coverage is from 4 p.m., February 28 to 4 p.m., March 6, Pacific Standard Time. We detected and processed 442 earthquakes during the 7-day period covered. There was only one event this week over M3. A M3.1 which occurred Thursday evening north of Claremont. This event is within the area of the Upland aftershock zone (M5.3, 28-FEB-1990), but because it's been 4 years since there was any earthquake above a M2.5 in that region, we do not consider it to be an aftershock. Though it occurred in a populated area and was large enough to feel there were no felt reports received from this event, or any other, in the lab this week. 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 ------------------------------------------------------------- 2/28 4:30 pm 34 20.2 116 27.8 2.2 15 mi. N of Yucca Valley 2/28 4:30 pm 34 20.6 116 28.2 2.2 " 2/28 7:01 pm 32 30.9 115 14.2 2.3 18 mi. SE of Calexico 2/28 9:07 pm 34 20.3 116 28.3 2.4 15 mi. N of Yucca Valley 2/28 10:38 pm 34 9.1 117 44.0 3.1 3 mi. N of Claremont Colleges 2/29 1:31 am 35 44.0 117 37.7 2.1 8 mi. NNE of Ridgecrest 2/29 7:31 am 35 59.9 120 31.5 2.7 8 mi. NW of Parkfield 2/29 9:55 am 33 9.8 117 53.4 2.4 22 mi. SSW of Dana Point 2/29 12:57 pm 34 23.2 116 28.3 2.5 18 mi. N of Yucca Valley 2/29 4:40 pm 35 44.6 117 40.0 2.1 8 mi. N of Ridgecrest 2/29 9:20 pm 35 36.6 118 29.5 2.2 2 mi. SW of town of Lake Isabella 2/29 10:39 pm 33 11.8 115 36.0 2.0 2 mi. NE of Obsidian Butte 2/29 10:41 pm 33 11.6 115 36.3 2.0 " 2/29 11:53 pm 34 19.2 116 26.7 2.2 13 mi. N of Yucca Valley 3/ 1 5:49 am 33 28.4 116 27.2 2.4 15 mi. NNW of Borrego Springs 3/ 1 10:38 am 34 20.3 116 28.2 2.9 15 mi. N of Yucca Valley 3/ 1 11:44 am 34 20.4 116 27.9 2.0 " 3/ 1 4:32 pm 32 30.7 117 26.5 2.3 21 mi. SSW of Mission Beach 3/ 1 4:50 pm 33 11.4 115 36.2 2.7 2 mi. NE of Obsidian Butte 3/ 2 2:02 am 35 0.9 116 58.4 2.5 9 mi. NNE of Barstow 3/ 2 3:42 am 36 51.9 116 11.6 2.5 46 mi. NE of Furnace Creek 3/ 2 6:58 am 35 43.7 117 40.7 2.0 7 mi. N of Ridgecrest 3/ 2 7:42 am 35 43.9 117 40.7 2.1 " 3/ 2 7:52 am 35 43.9 117 40.7 2.0 " 3/ 2 10:26 am 34 7.8 116 23.1 2.0 3 mi. ENE of Yucca Valley 3/ 2 1:08 pm 34 13.4 116 47.3 2.1 4 mi. SE of Big Bear City 3/ 2 7:25 pm 34 33.8 116 29.6 2.4 30 mi. N of Yucca Valley 3/ 2 8:03 pm 34 20.0 116 28.1 2.4 14 mi. N of Yucca Valley 3/ 2 8:52 pm 34 17.2 118 32.2 2.2 2 mi. WNW of Granada Hills 3/ 2 11:07 pm 36 11.4 117 53.7 2.3 4 mi. NE of Haiwee Reservoir 3/ 3 1:51 am 35 44.5 117 37.5 2.0 8 mi. NNE of Ridgecrest 3/ 3 4:46 am 32 22.1 115 22.0 2.1 22 mi. SSE of Calexico 3/ 3 4:48 am 32 21.5 115 21.5 2.1 " 3/ 3 10:22 am 35 43.9 117 40.8 2.5 7 mi. N of Ridgecrest 3/ 3 10:23 am 35 43.9 117 40.5 2.3 " 3/ 3 8:30 pm 34 18.3 116 26.6 2.1 12 mi. N of Yucca Valley 3/ 4 8:08 am 34 30.0 116 31.4 2.0 26 mi. N of Yucca Valley 3/ 4 10:30 am 34 9.3 116 25.6 2.2 2 mi. NNE of Yucca Valley 3/ 4 2:29 pm 36 10.9 117 54.4 2.0 3 mi. NE of Haiwee Reservoir 3/ 4 3:00 pm 36 11.3 117 53.5 2.2 4 mi. NE of Haiwee Reservoir 3/ 4 3:00 pm 35 19.1 118 32.1 2.0 14 mi. NNW of Tehachapi 3/ 4 11:52 pm 35 43.7 117 40.6 2.3 7 mi. N of Ridgecrest 3/ 6 2:00 am 34 35.5 116 37.0 2.0 21 mi. ENE of Lucerne Valley 3/ 6 7:31 am 35 45.4 117 38.7 2.3 9 mi. N of Ridgecrest 3/ 6 9:18 am 35 44.2 117 37.5 2.2 8 mi. NNE of Ridgecrest 3/ 6 10:26 am 32 0.6 115 48.0 2.3 48 mi. SSW of Calexico 3/ 6 10:27 am 32 2.1 115 48.6 2.1 47 mi. SSW of Calexico 3/ 6 12:16 pm 33 51.8 116 23.0 2.3 7 mi. NE of Cathedral City -------------------------------------------------------------