SOUTHERN CALIFORNIA SEISMOGRAPHIC NETWORK A Cooperative Project of Caltech and the U.S. Geological Survey January 18, 1996 Weekly Earthquake Report for Southern California ------------------------------------------------ January 11 - 17, 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, January 11, Universal Time (ie. GMT), to midnight Wednesday night, January 17, 1995, Universal Time. In local time, the period of coverage is from 4 p.m., January 10 to 4 p.m., January 17, Pacific Standard Time. We detected and processed 674 earthquakes during the 7-day period covered. The Ridgecrest sequence continued this week, the largest ones being a M3.6 late last Thursday night and a M3.7 Friday afternoon. There was also a M3.4 late Monday afternoon. The public does not seem to be bothered enough by these quakes to call us, but I'm sure the M3+'s were felt. There was also a little more action from the Northridge sequence this weekend. Three quakes were felt: a M2.7 near Pacoima and a M2.9 near Valencia, both on Friday night. The next morning, a M3.4 occurred under the mountains north of San Fernando. As of yesterday, the second anniversary of the Northridge quake, there have been a total of 12,587 aftershocks recorded. Two quakes in the Big Bear area were also felt: a M3.0 early Tuesday morning and a M3.4 Wednesday afternoon. Probably these are aftershocks of the Mw6.2 Big Bear quake, part of the Landers/Big Bear sequence. 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 ------------------------------------------------------------- 1/10 6:58 pm 36 1.2 120 0.6 3.3 21 mi. ESE of Coalinga 1/10 9:26 pm 36 1.9 120 0.5 2.5 20 mi. ESE of Coalinga 1/10 10:23 pm 35 43.9 117 37.8 2.6 7 mi. NNE of Ridgecrest 1/10 10:27 pm 35 46.9 117 38.3 3.0 11 mi. N of Ridgecrest 1/10 10:28 pm 35 47.4 117 38.8 2.8 " 1/10 10:29 pm 35 44.1 117 37.5 2.1 8 mi. NNE of Ridgecrest 1/10 10:30 pm 35 44.0 117 37.8 3.2 7 mi. NNE of Ridgecrest 1/10 10:33 pm 35 47.0 117 38.2 2.8 11 mi. N of Ridgecrest 1/10 10:38 pm 35 44.0 117 37.7 2.4 8 mi. NNE of Ridgecrest 1/10 11:20 pm 35 43.7 117 37.3 3.3 7 mi. NNE of Ridgecrest 1/10 11:34 pm 35 45.3 117 38.1 3.6 9 mi. N of Ridgecrest 1/11 12:11 am 35 45.9 117 38.3 2.5 10 mi. N of Ridgecrest 1/11 12:26 am 35 44.0 117 37.7 2.3 8 mi. NNE of Ridgecrest 1/11 12:46 am 34 59.6 116 56.6 2.3 8 mi. NNE of Barstow 1/11 4:25 am 35 17.6 118 30.4 2.1 11 mi. NNW of Tehachapi 1/11 7:37 am 35 44.1 117 37.5 2.6 8 mi. NNE of Ridgecrest 1/11 9:06 am 36 31.2 120 28.3 3.2 27 mi. NNW of Coalinga 1/11 10:11 am 35 43.1 119 34.2 2.3 35 mi. NE of Simmler 1/11 12:12 pm 35 46.5 117 39.0 2.0 10 mi. N of Ridgecrest 1/11 4:35 pm 35 47.3 117 39.4 3.7 11 mi. N of Ridgecrest 1/11 5:09 pm 35 44.4 117 37.7 2.2 8 mi. NNE of Ridgecrest 1/11 8:02 pm 35 44.0 117 37.7 2.5 7 mi. NNE of Ridgecrest 1/11 8:49 pm 34 21.2 116 28.6 2.6 16 mi. N of Yucca Valley 1/11 9:35 pm 35 11.5 118 37.5 2.2 10 mi. WNW of Tehachapi 1/11 9:35 pm 32 16.8 115 21.1 2.7 28 mi. SSE of Calexico 1/11 11:21 pm 35 47.5 120 20.9 2.1 5 mi. NNW of Cholame 1/11 11:50 pm 34 5.6 116 24.4 2.3 2 mi. SE of Yucca Valley 1/12 1:36 am 34 21.6 116 28.6 2.0 16 mi. N of Yucca Valley 1/12 2:26 am 34 21.5 116 28.2 2.1 " 1/12 3:27 am 36 8.6 119 56.3 3.1 23 mi. E of Coalinga 1/12 4:06 am 35 10.3 120 43.5 2.1 5 mi. WNW of Pismo Beach 1/12 5:21 am 35 1.2 116 58.0 2.2 9 mi. NNE of Barstow 1/12 7:16 am 35 44.5 117 37.8 2.3 8 mi. NNE of Ridgecrest 1/12 9:45 am 35 47.1 118 2.1 3.0 18 mi. SSW of Coso Junction 1/12 10:08 am 35 44.5 117 38.1 2.1 8 mi. NNE of Ridgecrest 1/12 10:25 am 35 44.4 117 38.2 2.3 " 1/12 1:53 pm 32 3.3 115 46.4 2.5 45 mi. SSW of Calexico 1/12 2:04 pm 34 1.8 116 19.7 2.2 7 mi. S of Joshua Tree 1/12 2:34 pm 34 4.9 116 22.4 2.0 4 mi. ESE of Yucca Valley 1/12 6:23 pm 34 8.9 116 25.8 2.3 2 mi. NNE of Yucca Valley 1/12 7:59 pm 33 32.8 116 41.0 2.0 Under Anza 1/12 10:13 pm 34 3.3 117 15.3 2.3 Under Loma Linda 1/12 10:13 pm 34 15.7 118 26.5 2.7 1 mi. S of Pacoima FELT 1/12 11:40 pm 34 23.5 118 37.9 2.9 3 mi. W of Valencia FELT 1/13 1:36 am 36 1.2 120 1.9 2.5 20 mi. ESE of Coalinga 1/13 3:13 am 32 30.7 116 59.4 2.4 4 mi. SE of San Ysidro 1/13 8:30 am 32 39.9 116 1.1 2.2 5 mi. SSW of Ocotillo 1/13 9:55 am 34 21.8 118 26.8 3.5 5 mi. N of San Fernando FELT 1/13 12:36 pm 35 44.9 117 37.9 2.3 8 mi. NNE of Ridgecrest 1/13 4:22 pm 33 51.8 118 18.5 2.0 2 mi. NW of Carson 1/13 4:39 pm 36 0.2 117 49.0 2.1 7 mi. ESE of Coso Junction 1/13 4:40 pm 36 0.6 117 48.8 2.2 " 1/13 8:13 pm 34 24.6 118 38.1 2.2 4 mi. WNW of Valencia 1/13 8:50 pm 33 11.5 115 33.9 2.1 4 mi. SW of Niland 1/13 9:49 pm 35 46.2 117 39.3 2.1 10 mi. N of Ridgecrest 1/13 10:14 pm 35 44.8 117 36.5 2.0 9 mi. NNE of Ridgecrest 1/13 11:09 pm 34 21.5 118 27.0 2.3 5 mi. N of San Fernando FELT 1/14 3:07 am 34 2.7 116 19.6 2.1 6 mi. S of Joshua Tree 1/14 3:47 am 33 9.5 115 58.7 2.2 8 mi. S of Salton City 1/14 5:20 am 35 45.1 117 38.1 2.3 9 mi. N of Ridgecrest 1/14 7:40 am 34 19.1 116 28.1 2.3 13 mi. N of Yucca Valley 1/14 12:16 pm 35 45.9 117 37.7 2.1 10 mi. NNE of Ridgecrest 1/14 3:00 pm 35 45.2 117 36.3 2.0 9 mi. NNE of Ridgecrest 1/14 3:01 pm 35 44.5 117 35.6 2.0 " 1/14 5:31 pm 35 45.8 117 38.7 2.4 " 1/14 6:12 pm 35 44.5 117 38.1 2.5 " 1/14 10:33 pm 35 45.1 117 37.5 2.5 " 1/14 10:37 pm 35 44.8 117 37.3 2.0 " 1/14 10:38 pm 35 44.9 117 36.2 2.0 " 1/14 10:52 pm 33 51.7 117 42.0 2.2 6 mi. ESE of Yorba Linda 1/14 10:55 pm 35 45.2 117 37.5 2.2 9 mi. NNE of Ridgecrest 1/14 11:01 pm 35 45.3 117 37.4 2.2 " 1/14 11:35 pm 35 44.6 117 37.5 2.2 " 1/15 6:04 am 35 45.1 117 36.8 2.0 " 1/15 6:30 am 35 46.0 117 38.8 2.0 10 mi. N of Ridgecrest 1/15 12:09 pm 35 44.8 117 38.1 2.2 8 mi. NNE of Ridgecrest 1/15 3:24 pm 35 46.1 117 38.8 2.2 10 mi. N of Ridgecrest 1/15 5:50 pm 35 44.5 117 37.2 3.4 8 mi. NNE of Ridgecrest FELT 1/15 6:03 pm 35 44.5 117 37.0 2.0 " 1/15 8:30 pm 35 20.8 118 34.1 2.5 16 mi. NNW of Tehachapi 1/16 4:47 am 34 13.4 116 55.3 3.0 1 mi. SSW of town of Big Bear Lake; FELT 1/16 10:10 am 35 0.8 116 58.0 2.0 9 mi. NNE of Barstow 1/16 7:21 pm 35 44.7 117 37.9 2.3 8 mi. NNE of Ridgecrest 1/16 10:33 pm 35 47.5 117 38.9 2.7 11 mi. N of Ridgecrest 1/17 12:50 am 35 18.8 118 32.7 2.1 13 mi. NNW of Tehachapi 1/17 6:50 am 33 13.4 115 34.7 2.0 3 mi. WSW of Niland 1/17 11:56 am 35 44.4 117 40.8 2.1 8 mi. N of Ridgecrest 1/17 12:16 pm 35 47.2 117 38.9 2.1 11 mi. N of Ridgecrest 1/17 3:09 pm 34 14.5 116 49.7 3.4 2 mi. SE of Big Bear City FELT -------------------------------------------------------------