SOUTHERN CALIFORNIA SEISMOGRAPHIC NETWORK A Cooperative Project of Caltech and the U.S. Geological Survey November 2, 1995 Weekly Earthquake Report for Southern California ------------------------------------------------ October 26 - November 1, 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, October 26, Universal Time (ie. GMT), to midnight Wednesday night, November 1, 1995, Universal Time. In local time, the period of coverage is from 5 p.m., October 25 Pacific Daylight Time to 4 p.m., November 1 Pacific Standard Time. Please note that using a G.M.T. time block constitutes a change in procedure for the Weekly Report, beginning with this issue. The reason for the change is so that we don't have to work all night on Wednesdays to finish the processing. Event times will still be tabulated in local time. We detected and processed 739 earthquakes during the 7-day period covered. There were only three quakes above M3 this week. The first was a Ridgecrest aftershock, M3.0, on Saturday morning. The second occurred on Halloween evening northwest of Tehachapi and had a magnitude of M3.1. The third, M3.0, was an aftershock of the June 28, '92 Mw 6.4 Big Bear quake (itself an aftershock of the Mw7.3 Landers quake on the same day). We only got "felt" inquiries about the Big Bear one. 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 ------------------------------------------------------------- 10/25 7:31 pm 35 47.2 117 37.8 2.4 11 mi. N of Ridgecrest 10/25 10:25 pm 35 47.5 117 38.6 2.2 " 10/26 10:55 am 34 0.9 116 19.4 2.1 8 mi. S of Joshua Tree 10/26 11:32 am 35 1.6 116 58.6 2.2 9 mi. NNE of Barstow 10/26 11:33 am 35 47.0 118 1.9 2.0 18 mi. SSW of Coso Junction 10/26 1:50 pm 34 25.0 116 28.3 2.0 20 mi. N of Yucca Valley 10/26 7:43 pm 34 8.7 116 25.1 2.0 2 mi. NE of Yucca Valley 10/26 8:45 pm 34 12.7 116 50.5 2.3 3 mi. S of Big Bear City 10/26 11:09 pm 35 47.2 117 37.7 2.1 11 mi. N of Ridgecrest 10/27 2:05 am 33 40.8 118 2.7 2.1 Under Bolsa Chica Beach 10/27 5:34 am 34 6.2 116 55.7 2.4 5 mi. W of Mt. San Gorgonio 10/27 12:36 pm 34 22.7 119 1.3 2.4 6 mi. WSW of Fillmore 10/27 2:28 pm 34 59.4 116 59.3 2.1 7 mi. NNE of Barstow 10/27 8:01 pm 34 2.5 117 33.0 2.0 5 mi. SSE of Rancho Cucamonga 10/27 9:52 pm 36 31.5 120 32.2 2.6 28 mi. NNW of Coalinga 10/27 10:11 pm 34 8.8 116 25.1 2.4 2 mi. NE of Yucca Valley 10/27 10:15 pm 34 8.9 116 25.5 2.3 " 10/28 3:16 am 34 8.9 116 25.1 2.4 " 10/28 4:50 am 34 13.7 116 50.5 2.4 2 mi. SSE of Big Bear City 10/28 5:42 am 35 48.6 117 38.1 2.1 13 mi. N of Ridgecrest 10/28 5:53 am 35 47.6 117 38.6 2.2 11 mi. N of Ridgecrest 10/28 6:36 am 34 13.6 116 50.6 2.2 2 mi. SSE of Big Bear City 10/28 9:17 am 35 47.1 117 39.0 3.0 11 mi. N of Ridgecrest 10/28 9:25 am 35 47.1 117 39.0 2.4 " 10/28 11:40 am 34 8.9 116 25.1 2.0 2 mi. NE of Yucca Valley 10/28 2:27 pm 34 14.4 118 28.5 2.1 1 mi. NW of Panorama City 10/28 2:50 pm 35 51.5 117 41.0 2.0 16 mi. N of Ridgecrest 10/28 3:03 pm 34 57.2 116 56.4 2.1 6 mi. NE of Barstow 10/28 3:13 pm 34 8.6 116 25.1 2.0 2 mi. NE of Yucca Valley 10/28 9:20 pm 34 16.5 118 30.2 2.0 Under Granada Hills 10/28 10:49 pm 34 24.5 116 28.0 2.0 20 mi. N of Yucca Valley 10/29 12:01 am 35 47.3 117 38.6 2.0 11 mi. N of Ridgecrest 10/29 3:03 am 34 16.2 116 26.3 2.0 10 mi. N of Yucca Valley 10/29 5:49 am 34 45.5 119 2.2 2.2 6 mi. SW of Frazier Park 10/29 6:10 am 34 15.8 116 26.2 2.2 10 mi. N of Yucca Valley 10/29 6:49 am 34 54.6 119 0.4 2.0 4 mi. WSW of Grapevine 10/29 8:08 am 34 22.3 116 28.2 2.0 17 mi. N of Yucca Valley 10/29 8:11 am 34 9.0 117 28.0 2.0 3 mi. NNW of Fontana 10/29 10:19 am 34 21.0 116 28.3 2.9 16 mi. N of Yucca Valley 10/29 10:30 am 35 44.6 117 37.8 2.0 8 mi. NNE of Ridgecrest 10/29 5:28 pm 34 16.2 118 26.0 2.2 1 mi. SSE of Pacoima 10/29 7:01 pm 34 16.0 116 26.1 2.1 10 mi. N of Yucca Valley 10/29 9:11 pm 36 29.3 117 31.2 2.2 10 mi. NNW of Panamint Springs 10/30 3:57 pm 32 49.1 115 28.0 2.2 5 mi. ENE of El Centro 10/30 5:24 pm 33 58.8 116 16.9 2.0 11 mi. S of Joshua Tree 10/30 7:12 pm 35 44.6 117 38.0 2.1 8 mi. NNE of Ridgecrest 10/30 7:20 pm 35 47.1 117 37.9 2.0 11 mi. N of Ridgecrest 10/31 1:06 am 35 20.9 118 34.1 2.1 16 mi. NNW of Tehachapi 10/31 1:36 am 35 20.8 118 34.2 2.5 " 10/31 11:59 am 33 0.9 115 22.8 2.0 9 mi. ENE of Brawley 10/31 3:49 pm 33 16.6 115 40.0 2.4 6 mi. SE of Bombay Beach 10/31 7:11 pm 35 20.8 118 34.3 3.1 16 mi. NNW of Tehachapi 10/31 10:50 pm 34 58.6 116 57.5 2.2 7 mi. NNE of Barstow 10/31 10:59 pm 34 25.2 116 30.1 2.0 21 mi. N of Yucca Valley 11/1 12:51 am 35 20.8 118 34.3 2.2 16 mi. NNW of Tehachapi 11/1 12:59 am 34 27.7 116 31.3 2.5 24 mi. N of Yucca Valley 11/1 7:39 am 34 13.6 116 50.5 3.0 2 mi. SSE of Big Bear City, FELT 11/1 7:43 am 36 7.2 119 57.3 2.6 22 mi. E of Coalinga 11/1 8:17 am 34 13.6 116 50.5 2.1 2 mi. SSE of Big Bear City 11/1 8:19 am 34 13.8 116 50.5 2.2 " 11/1 1:22 pm 35 45.5 117 38.5 2.1 9 mi. N of Ridgecrest -------------------------------------------------------------