January 12, 1995 Weekly Earthquake Report for Southern California ------------------------------------------------ January 5 - 11, 1995 Prepared by: Kate Hutton, Seismological Laboratory (kate@bombay.gps.caltech.edu) Lucy Jones, U.S. Geological Survey California Institute of Technology This document is a commentary on current seismic activity. The earthquakes discussed have been detected and processed automatically. All epicenters and magnitudes have been reviewed to exclude obvious blunders; however, they must still be considered preliminary. 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 5, Pacific Standard Time, to midnight Wednesday night, January 11, 1995, Pacific Standard Time. We recorded 225 earthquakes of M1.0 or larger during the 7-day period covered. We had another very quiet week. The only quake in our area that was felt was M3.0 near Barstow on Friday afternoon. With the exception of a M3.7 in Baja, which occurred on Tuesday evening, it was also the week's largest event. A total of 41% of the week's earthquakes were aftershocks: 12% from Northridge and 29% from Landers). 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 ------------------------------------------------------------- 1/5 2:44 am 34 34.3 116 32.5 2.0 24 mi. ENE of Lucerne Valley 1/5 5:08 am 34 17.0 118 23.4 2.1 2 mi. E of San Fernando 1/5 5:46 am 34 16.0 116 28.1 2.0 10 mi. N of Yucca Valley 1/5 7:15 am 34 15.9 118 34.8 2.0 3 mi. NW of Northridge 1/5 7:57 pm 36 14.8 120 50.0 2.9 27 mi. WNW of Coalinga 1/5 10:53 pm 34 33.7 116 31.2 2.7 25 mi. ENE of Lucerne Valley 1/5 10:55 pm 34 33.9 116 31.6 2.2 " 1/5 10:56 pm 34 15.4 118 39.8 2.0 2 mi. ESE of Simi Valley 1/5 11:30 pm 32 54.6 117 52.7 2.5 27 mi. ENE of San Clemente Is. 1/6 4:05 am 36 7.8 117 50.5 2.3 5 mi. E of Haiwee Reservoir 1/6 6:03 am 34 29.7 116 30.7 2.2 26 mi. N of Yucca Valley 1/6 6:59 am 34 4.2 119 37.9 2.1 7 mi. WNW of Santa Cruz Is. 1/6 6:59 am 33 4.0 116 25.9 2.2 9 mi. E of Julian 1/6 8:46 am 35 54.7 117 56.3 2.3 9 mi. S of Coso Junction 1/6 8:59 am 36 7.3 117 50.1 2.0 6 mi. E of Haiwee Reservoir 1/6 10:20 am 34 2.3 117 30.3 2.3 2 mi. SE of the I10/I15 interchange 1/6 2:14 pm 35 1.8 116 59.4 3.0 10 mi. N of Barstow; FELT 1/6 5:17 pm 34 28.9 116 30.0 2.5 25 mi. N of Yucca Valley 1/6 6:54 pm 36 7.3 117 50.6 2.6 5 mi. E of Haiwee Reservoir 1/6 7:53 pm 33 48.8 116 12.1 2.5 6 mi. N of Indio 1/7 2:38 am 33 48.9 116 12.0 2.9 " 1/7 5:12 am 35 55.9 117 40.1 2.6 17 mi. ESE of Coso Junction 1/7 7:51 am 33 21.9 116 22.5 2.3 7 mi. N of Borrego Springs 1/7 11:14 am 35 55.9 117 40.0 2.3 17 mi. ESE of Coso Junction 1/7 3:43 pm 35 44.1 118 20.8 2.6 9 mi. NE of the town of Lake Isabella 1/7 10:08 pm 34 1.0 116 19.3 2.0 9 mi. SE of Yucca Valley 1/8 12:31 am 33 28.5 118 30.0 2.5 13 mi. NW of Avalon, Catalina Island 1/8 12:29 pm 36 4.5 117 27.9 2.0 18 mi. S of Panamint Springs 1/8 1:20 pm 34 17.3 118 28.6 2.1 2 mi. WNW of San Fernando 1/8 4:26 pm 36 7.1 117 50.8 2.3 5 mi. ESE of Haiwee Reservoir 1/8 6:08 pm 34 12.6 117 39.5 2.3 5 mi. S of Mt. Baldy 1/9 7:31 am 34 0.9 116 21.0 2.2 8 mi. SE of Yucca Valley 1/9 11:33 am 36 7.1 117 50.2 2.1 6 mi. ESE of Haiwee Reservoir 1/9 3:22 pm 33 18.6 116 17.9 2.2 5 mi. NE of Borrego Springs 1/10 1:39 am 34 13.5 118 35.5 2.0 1 mi. NNE of Canoga Park 1/10 5:09 am 34 17.4 118 23.3 2.6 2 mi. ENE of San Fernando 1/10 8:47 am 34 47.0 116 17.5 2.1 35 mi. SSW of Baker 1/10 11:03 am 33 15.3 116 17.7 2.2 4 mi. E of Borrego Springs 1/10 8:51 pm 32 20.0 115 16.4 3.7 26 mi. SSE of Calexico 1/10 8:59 pm 34 20.1 118 26.1 2.4 3 mi. N of San Fernando 1/10 9:15 pm 34 1.6 117 13.4 2.0 3 mi. SW of Redlands 1/11 4:08 am 36 13.1 119 22.1 2.2 8 mi. SSW of Visalia 1/11 10:32 am 34 3.1 117 30.3 2.4 2 mi. ESE of the I10/I15 interchange 1/11 11:08 am 35 56.2 117 40.0 2.3 17 mi. ESE of Coso Junction 1/11 5:47 pm 33 28.8 116 28.5 2.3 12 mi. ESE of Anza 1/11 8:20 pm 34 20.8 118 40.6 2.1 5 mi. NNE of Simi Valley 1/11 9:54 pm 34 22.6 116 27.4 2.4 17 mi. N of Yucca Valley ------------------------------------------------------------- Figure 1. A map of southern California showing the earthquakes recorded during the past week by the Caltech/USGS Seismic Network. Major faults are marked, as well as the metropolitan areas of Los Angeles (L.A.), Palm Springs (P.S.), San Diego (S.D.), and Santa Barbara (S.B.). The circles denote the earthquakes, the size of the circle indicating the magnitude.