SOUTHERN CALIFORNIA SEISMOGRAPHIC NETWORK A Cooperative Project of Caltech and the U.S. Geological Survey January 9, 1997 Weekly Earthquake Report for Southern California ------------------------------------------------ January 2 - 8, 1997 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 818-395-6327. For daily updates, call our Earthquake Information Hotline: 818-395-6977. -------------------------------- This week's Report covers the time period from midnight Thursday morning, January 2, Universal Time (ie. GMT), to midnight Wednesday night, January 8, Universal Time. In local time, the period of coverage is from 4 p.m., January 1, Pacific Standard Time, to 4 p.m., January 8, Pacific Standard Time. We detected and processed 349 earthquakes during the seven-day period covered. Seismicity was slightly high this week due to a small swarm of aftershocks to the Nov. 27, 1996 Mw5.3 Coso earthquake. The largest of this week's events was a M3.8 on Saturday morning. An earthquake of this size is quite noticable and might have been felt, but we got no reports. The epicentral area is unpopulated. The M3.8 had a M3.1 aftershock 27 minutes later, but otherwise there were no events above M3, and no events reported felt. Table 1 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 ------------------------------------------------------------- 1/1 6:19 pm 33 33.7 118 11.0 2.5 11 mi. SSE of Pt. Fermin 1/1 9:06 pm 34 17.7 118 33.3 2.0 3 mi. WNW of Granada Hills 1/2 6:38 am 36 5.4 117 39.4 2.5 16 mi. E of Coso Junction 1/3 4:05 am 32 0.5 115 45.0 2.5 48 mi. SSW of Calexico 1/3 5:36 pm 32 56.7 117 40.6 2.0 24 mi. SW of Oceanside 1/3 5:53 pm 36 3.8 117 38.7 2.7 16 mi. E of Coso Junction 1/3 6:10 pm 36 5.8 117 39.7 2.0 16 mi. E of Haiwee Reser- voir 1/3 11:21 pm 36 4.0 117 38.9 2.2 16 mi. E of Coso Junction 1/4 2:15 am 36 4.1 117 38.8 2.6 " 1/4 4:52 am 36 3.8 117 40.4 2.2 15 mi. E of Coso Junction 1/4 6:58 am 36 4.1 117 38.9 3.8 16 mi. E of Coso Junction 1/4 7:00 am 36 4.1 117 38.5 2.0 17 mi. E of Coso Junction 1/4 7:25 am 36 3.8 117 38.7 3.1 " 1/4 8:17 am 36 3.8 117 38.4 2.2 " 1/4 9:00 am 36 4.2 117 39.1 2.5 16 mi. E of Coso Junction 1/4 9:26 am 36 4.6 117 38.9 2.0 " 1/4 10:02 am 36 3.8 117 38.6 2.5 17 mi. E of Coso Junction 1/4 10:49 am 36 3.8 117 38.7 2.6 " 1/4 2:48 pm 36 4.6 117 38.9 2.0 16 mi. E of Coso Junction 1/4 3:15 pm 36 4.0 117 38.4 2.3 17 mi. E of Coso Junction 1/4 4:07 pm 34 37.7 116 35.7 2.1 23 mi. ENE of Lucerne Valley 1/4 8:29 pm 36 4.8 117 39.2 2.0 16 mi. E of Coso Junction 1/4 10:49 pm 35 47.8 117 38.3 2.6 12 mi. N of Ridgecrest 1/4 10:50 pm 34 19.3 118 31.3 2.0 3 mi. NNW of Granada Hills 1/5 2:07 am 36 4.0 117 38.8 2.3 16 mi. E of Coso Junction 1/5 3:52 am 33 21.5 116 17.0 2.0 8 mi. NE of Borrego Springs 1/5 3:52 am 33 21.7 116 17.1 2.1 " 1/5 5:48 am 36 3.8 117 38.6 2.1 17 mi. E of Coso Junction 1/6 8:25 am 36 3.8 117 38.7 2.0 " 1/6 9:04 am 33 42.9 118 1.8 2.0 1 mi. NNE of Bolsa Chica Beach 1/6 12:50 pm 32 7.8 115 34.0 2.9 37 mi. S of Calexico 1/6 1:05 pm 36 3.4 117 37.5 2.4 18 mi. E of Coso Junction 1/7 5:56 pm 32 39.2 115 40.4 2.1 10 mi. W of Calexico 1/8 1:54 am 36 3.6 117 37.7 2.0 17 mi. E of Coso Junction 1/8 7:30 am 34 2.5 117 15.0 2.6 Under Loma Linda 1/8 2:11 pm 36 4.8 117 39.1 2.5 16 mi. E of Coso Junction -------------------------------------------------------------