SOUTHERN CALIFORNIA SEISMOGRAPHIC NETWORK A Cooperative Project of Caltech and the U.S. Geological Survey August 10, 1995 Weekly Earthquake Report for Southern California ------------------------------------------------ August 3 - 9, 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, August 3, Pacific Daylight Time, to midnight Wednesday night, August 9, 1995, Pacific Daylight Time. We recorded 273 earthquakes of during the 7-day period covered. There were five quake of M3 or better this week. Two of these were actually in Mexico, but close enough to feel in the U.S. Another (M3.3 last night) took place near Coalinga; readers should see the Northern California Report for further details on that one. The two quakes in Mexico were: a M3.4 very early on Sunday morning, southeast of San Ysidro, and a M3.4 south of the Imperial Valley on Wednesday morning. There was also a M3.3 on Monday afternoon, in the Coso Range, east of Coso Junction. Then, early Wednesday morning, there was a M3.3 under the Santa Barbara Channel. The Santa Barbara Channel focal mechanism is thrust, which is typical for that area. The only quakes that were reported to us as felt were the M3.4 San Ysidro quake, and a small (M2.6) quake in the Panorama City area on Tuesday morning. 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 ------------------------------------------------------------- 8/3 10:35 am 34 23.4 116 28.1 2.2 18 mi. N of Yucca Valley 8/3 10:44 am 34 23.2 116 28.2 2.1 " 8/3 12:48 pm 34 23.2 116 28.2 2.0 " 8/3 7:37 pm 33 48.5 116 54.2 2.5 5 mi. NE of Hemet 8/3 11:22 pm 35 2.0 116 59.4 2.0 10 mi. N of Barstow 8/4 5:32 pm 34 19.4 116 25.6 2.3 14 mi. N of Yucca Valley 8/5 2:49 pm 34 22.0 116 28.3 2.4 17 mi. N of Yucca Valley 8/5 3:46 pm 34 37.2 116 34.9 2.0 24 mi. ENE of Lucerne Valley 8/6 12:55 am 33 18.9 116 19.9 2.0 4 mi. NNE of Borrego Springs 8/6 1:28 am 34 20.6 118 34.0 2.3 3 mi. S of Valencia 8/6 4:22 am 32 8.9 116 43.1 3.4 33 mi. SE of San Ysidro FELT 8/6 5:41 pm 34 32.9 116 32.5 2.0 24 mi. ENE of Lucerne Valley 8/6 8:09 pm 34 45.1 118 54.4 2.1 4 mi. SW of Gorman 8/6 8:21 pm 33 55.5 117 6.3 2.2 7 mi. W of Beaumont 8/6 11:37 pm 34 29.4 116 30.6 2.4 25 mi. N of Yucca Valley 8/7 3:10 am 34 17.5 118 25.6 2.5 Under San Fernando 8/7 9:15 am 32 43.6 115 55.3 2.1 4 mi. E of Ocotillo 8/7 11:22 am 34 23.3 116 28.2 2.0 18 mi. N of Yucca Valley 8/7 1:16 pm 36 1.5 117 53.1 2.0 3 mi. ESE of Coso Junction 8/7 5:45 pm 36 0.9 117 49.0 3.3 7 mi. ESE of Coso Junction 8/7 10:21 pm 34 28.2 116 30.8 2.1 24 mi. N of Yucca Valley 8/8 12:53 am 32 32.6 117 14.7 2.5 12 mi. SSW of San Diego 8/8 8:09 am 33 21.0 116 21.9 2.1 6 mi. N of Borrego Springs 8/8 8:01 pm 34 12.9 118 28.7 2.6 1 mi. WSW of Panorama City FELT 8/8 8:58 pm 32 26.3 115 26.0 2.6 16 mi. SSE of Calexico 8/9 5:16 am 34 14.3 119 38.8 3.3 13 mi. SSE of downtown Santa Barbara 8/9 6:53 am 32 19.0 115 15.6 3.4 27 mi. SSE of Calexico 8/9 9:01 am 34 13.7 118 35.3 2.0 2 mi. SSE of Chatsworth 8/9 9:58 am 33 9.4 115 38.9 2.1 1 mi. SW of Obsidian Butte 8/9 12:39 pm 35 56.0 117 44.7 2.0 13 mi. SE of Coso Junction 8/9 10:17 pm 36 25.7 120 4.5 3.3 25 mi. NE of Coalinga -------------------------------------------------------------