SOUTHERN CALIFORNIA SEISMOGRAPHIC NETWORK A Cooperative Project of Caltech and the U.S. Geological Survey August 29, 1996 Weekly Earthquake Report for Southern California ------------------------------------------------ August 22 - 28, 1996 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, August 22, Universal Time (ie. GMT), to midnight Wednesday night, August 28, Universal Time. In local time, the period of coverage is from 5 p.m., August 21, Pacific Daylight Time, to 5 p.m., August 28, Pacific Daylight Time. We detected and processed 283 earthquakes during the seven-day period covered. There was nothing particularly exciting about the seismicity this week. There were two earthquakes felt. The first one was a M3.1 along the coast between Malibu and Ventura. It happened on Sunday morning and was felt in Simi Valley. It had a strike-slip focal mechanism and was not an aftershock. The other felt quake was very small, M2.3 near Chatsworth on Monday evening. It was a Northridge aftershock. 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 ------------------------------------------------------------- 8/21 5:22 pm 34 14.5 119 42.8 2.3 12 mi. S of downtown Santa Barbara 8/21 7:05 pm 34 14.9 119 42.1 2.3 " 8/21 7:32 pm 33 59.5 116 16.5 2.3 10 mi. SSE of Joshua Tree 8/21 7:37 pm 34 15.1 119 41.6 2.4 11 mi. S of downtown Santa Barbara 8/21 8:15 pm 35 52.1 118 25.5 2.0 16 mi. N of town of Lake Isabella 8/22 10:21 am 33 40.8 116 42.8 2.0 4 mi. S of Idyllwild 8/22 11:36 am 34 59.9 116 57.2 2.2 8 mi. NNE of Barstow 8/22 11:08 pm 34 57.3 116 55.9 2.2 6 mi. NE of Barstow 8/22 11:39 pm 34 54.1 116 55.6 2.0 5 mi. E of Barstow 8/23 1:36 am 35 49.3 117 42.2 2.1 14 mi. N of Ridgecrest 8/23 3:48 am 34 12.7 119 31.4 2.0 12 mi. N of Santa Cruz Is. 8/23 6:56 am 33 27.3 116 30.0 2.0 12 mi. SE of Anza 8/23 2:13 pm 35 49.5 117 42.3 2.5 14 mi. N of Ridgecrest 8/23 5:55 pm 35 49.5 117 42.2 2.2 " 8/25 1:27 am 35 5.8 118 18.4 2.7 8 mi. WNW of Mojave 8/25 4:44 am 35 49.4 117 42.4 2.1 14 mi. N of Ridgecrest 8/25 5:08 am 35 7.4 119 5.2 2.3 11 mi. NW of Wheeler Ridge 8/25 7:02 am 34 2.4 118 57.8 3.1 1 mi. W of Leo Carrillo State Beach; FELT 8/25 9:10 am 35 19.8 120 59.0 2.9 8 mi. WSW of Morro Bay 8/25 9:17 am 35 46.9 117 37.6 2.0 11 mi. NNE of Ridgecrest 8/25 4:31 pm 34 11.1 116 24.1 2.2 5 mi. NNE of Yucca Valley 8/25 6:57 pm 34 37.0 116 35.3 2.0 23 mi. ENE of Lucerne Valley 8/26 7:31 am 34 18.9 116 26.3 2.1 13 mi. N of Yucca Valley 8/26 9:36 am 34 30.7 116 31.8 2.0 27 mi. N of Yucca Valley 8/26 10:09 am 35 47.1 117 38.5 2.5 11 mi. N of Ridgecrest 8/26 11:00 am 34 33.3 116 29.3 2.0 30 mi. N of Yucca Valley 8/26 1:20 pm 34 12.4 118 37.4 2.1 1 mi. WNW of Canoga Park 8/26 6:02 pm 35 49.6 117 42.3 2.5 14 mi. N of Ridgecrest 8/26 10:59 pm 34 14.4 118 38.5 2.3 2 mi. WSW of Chatsworth FELT 8/27 2:03 am 34 20.2 116 52.2 2.0 5 mi. N of Big Bear City 8/27 3:14 am 33 11.1 115 35.7 2.0 2 mi. ENE of Obsidian Butte 8/27 4:08 am 35 49.5 117 42.3 2.1 14 mi. N of Ridgecrest 8/27 10:37 am 34 22.8 116 27.3 2.3 18 mi. N of Yucca Valley 8/27 12:49 pm 34 22.9 116 24.5 2.5 17 mi. NNW of Joshua Tree 8/27 2:36 pm 36 4.6 117 52.8 2.5 4 mi. ENE of Coso Junction 8/28 6:23 am 34 6.4 116 55.2 2.4 5 mi. W of Mt. San Gorgonio -------------------------------------------------------------