SOUTHERN CALIFORNIA SEISMOGRAPHIC NETWORK A Cooperative Project of Caltech and the U.S. Geological Survey December 21, 1995 Weekly Earthquake Report for Southern California ------------------------------------------------ December 14 - 20, 1995 Prepared by: Kate Hutton, Seismological Laboratory (kate@bombay.gps.caltech.edu) 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, December 14, Universal Time (ie. GMT), to midnight Wednesday night, December 20, 1995, Universal Time. In local time, the period of coverage is from 4 p.m., December 14 to 4 p.m., December 20 Pacific Standard Time. We detected and processed 462 earthquakes during the 7-day period covered. The seismicity this week is back to the rate and geo- graphic distribution that we have become accustomed to this year. There were only three M3+ quakes. The first was a M3.2 Ridge- crest event last Thursday evening. The second was another M3.2 quake near Temecula on Tuesday morning. The third was also a M3.2, this time a Landers aftershock on Tuesday evening. As far as we know, the Temecula quake was the only one that was felt. 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 ------------------------------------------------------------- 12/13 8:44 pm 35 44.0 117 37.5 2.0 8 mi. NNE of Ridgecrest 12/14 12:58 am 34 16.6 118 25.3 2.0 1 mi. ESE of San Fernando 12/14 1:00 am 34 16.5 118 25.9 2.0 Under Pacoima 12/14 6:31 am 35 46.6 117 41.0 2.0 10 mi. N of Ridgecrest 12/14 7:52 am 35 50.5 117 40.1 2.4 15 mi. N of Ridgecrest 12/14 2:43 pm 35 46.2 117 39.0 2.0 10 mi. N of Ridgecrest 12/14 2:54 pm 35 45.4 118 29.9 2.2 8 mi. NNW of town of Lake Isabella 12/14 10:03 pm 35 44.1 117 38.2 3.2 8 mi. NNE of Ridgecrest 12/14 10:16 pm 34 25.8 116 29.9 2.1 21 mi. N of Yucca Valley 12/14 10:22 pm 35 44.0 117 38.4 2.6 7 mi. N of Ridgecrest 12/15 11:17 am 35 46.9 117 39.1 2.3 11 mi. N of Ridgecrest 12/15 3:53 pm 33 40.3 117 57.9 2.1 3 mi. SSW of Fountain Valley 12/15 5:01 pm 35 50.7 117 40.0 2.4 15 mi. N of Ridgecrest 12/16 3:58 am 34 17.8 117 48.5 2.6 9 mi. W of Mt. Baldy 12/16 12:05 pm 35 44.2 117 37.8 2.0 8 mi. NNE of Ridgecrest 12/16 7:30 pm 34 52.3 116 29.5 2.1 30 mi. E of Barstow 12/17 12:26 am 33 58.3 117 13.8 2.3 5 mi. SSE of Loma Linda 12/17 7:21 am 35 47.4 117 39.2 2.1 11 mi. N of Ridgecrest 12/17 11:41 am 33 36.3 116 38.3 2.4 3 mi. NNE of Anza 12/17 11:56 am 35 45.5 117 39.8 2.3 9 mi. N of Ridgecrest 12/17 12:37 pm 34 31.9 116 32.7 2.0 25 mi. NE of Big Bear 12/17 1:25 pm 33 52.8 118 21.4 2.0 2 mi. S of Hawthorne 12/17 2:32 pm 34 37.1 116 37.9 2.5 21 mi. NE of Lucerne Valley 12/17 3:00 pm 34 9.7 116 26.2 2.2 3 mi. N of Yucca Valley 12/17 9:05 pm 34 22.7 116 27.5 2.8 17 mi. N of Yucca Valley 12/17 11:16 pm 35 41.7 116 39.7 2.0 26 mi. NNE of Goldstone Lake 12/18 11:53 am 34 17.2 118 42.4 2.7 Under Simi Valley 12/18 12:38 pm 33 16.5 115 59.2 2.3 1 mi. W of Salton City 12/18 3:03 pm 34 14.0 118 29.6 2.1 2 mi. S of Granada Hills 12/19 1:55 am 35 48.4 117 56.0 2.1 16 mi. S of Coso Junction 12/19 9:26 am 33 34.2 117 6.2 3.2 6 mi. NNE of Temecula FELT 12/19 10:33 am 34 9.6 116 25.9 2.1 2 mi. NNE of Yucca Valley 12/19 12:43 pm 36 1.2 117 53.4 2.0 3 mi. ESE of Coso Junction 12/19 3:31 pm 35 49.0 116 35.5 2.6 21 mi. WSW of Shoshone 12/19 5:44 pm 34 9.6 116 11.6 2.9 7 mi. ENE of Joshua Tree 12/19 6:12 pm 36 2.6 117 44.1 2.2 11 mi. E of Coso Junction 12/19 6:58 pm 34 23.0 116 27.5 2.7 18 mi. N of Yucca Valley 12/19 7:46 pm 34 23.0 116 27.2 2.4 " 12/19 8:26 pm 34 23.2 116 27.4 2.2 " 12/19 8:28 pm 34 23.1 116 27.3 3.2 " 12/19 8:31 pm 34 22.9 116 27.5 2.0 " 12/19 8:33 pm 34 23.0 116 27.6 2.2 " 12/19 8:33 pm 34 23.0 116 27.4 2.1 " 12/19 9:16 pm 34 23.1 116 27.5 2.0 " 12/19 11:47 pm 34 23.1 116 27.3 2.3 " 12/20 4:41 am 34 13.0 118 33.7 2.0 1 mi. WNW of Reseda 12/20 8:37 am 34 23.2 116 27.5 2.4 18 mi. N of Yucca Valley 12/20 12:08 pm 34 10.0 116 26.1 2.0 3 mi. N of Yucca Valley 12/20 2:14 pm 34 2.0 117 12.2 2.1 2 mi. SW of Redlands -------------------------------------------------------------