May 12, 1994 Weekly Earthquake Report for Southern California ------------------------------------------------ May 5 - 11, 1994 Prepared by: Nick Scheckel, Seismological Laboratory Debbie Wells, 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, May 5, Pacific Daylight Time, to midnight Wednesday night, May 11, Pacific Daylight Time. We recorded 384 earthquakes this week. This week's rate differs just slightly below last week's with only two events felt. A M3.0 Landers aftershock occurring Sunday evening and a Northridge aftershock, a M3.2, occurring (almost 24 hours later) on Monday. Another M3.0 Landers after- shock went unfelt on Thursday morning near Big Bear City. The table lists the quakes 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 Daylight Time listed. Table 1 ------- Date Time N Lat. W Long. Mag ------------------------------------------------------------- 5/ 5 12:49 am 34 33.9 116 25.6 2.4 30 mi. N of Yucca Valley 5/ 5 1:21 am 35 0.7 116 57.8 2.1 9 mi. NNE of Barstow 5/ 5 4:11 am 34 29.3 116 30.3 2.2 25 mi. N of Yucca Valley 5/ 5 6:02 am 32 4.1 114 56.2 2.1 47 mi. SSW of Yuma, Arizona 5/ 5 7:17 am 34 19.4 116 50.0 3.0 4 mi. NNE of Big Bear City 5/ 5 9:58 am 34 58.5 116 57.3 2.1 7 mi. NNE of Barstow 5/ 5 11:30 am 36 55.0 117 25.2 2.1 26 mi. NW of Stovepipe Wells 5/ 5 7:18 pm 34 29.5 116 27.3 2.3 25 mi. N of Yucca Valley 5/ 5 8:17 pm 36 1.6 117 24.2 2.3 18 mi. N of Trona 5/ 5 8:52 pm 34 17.6 116 53.6 2.4 3 mi. NW of Big Bear City 5/ 5 9:29 pm 35 18.3 118 31.3 2.2 12 mi. NNW of Tehachapi 5/ 5 9:32 pm 35 55.2 117 50.4 3.0 10 mi. SE of Coso Junction 5/ 5 10:30 pm 34 21.1 118 32.7 2.2 2 mi. SSW of Newhall 5/ 5 11:41 pm 36 41.3 121 14.3 2.7 14 mi. SE of Hollister 5/ 6 12:57 am 34 22.2 116 28.2 2.4 17 mi. N of Yucca Valley 5/ 6 9:25 am 34 14.5 118 45.2 2.1 3 mi. SW of Simi Valley 5/ 6 10:40 am 33 41.3 117 24.6 2.1 15 mi. SSE of the I15/91 interchange 5/ 6 11:42 am 34 10.0 118 31.7 2.0 4 mi. S of Northridge 5/ 7 6:57 am 32 52.8 115 31.1 2.0 5 mi. S of Brawley 5/ 7 1:11 pm 34 30.9 118 55.6 2.2 8 mi. N of Fillmore 5/ 7 3:00 pm 35 1.3 116 58.3 2.2 9 mi. NNE of Barstow 5/ 7 3:59 pm 36 25.7 117 54.9 2.4 11 mi. NNE of Olancha 5/ 7 5:01 pm 35 18.5 119 21.7 2.0 12 mi. NNE of Taft 5/ 7 6:35 pm 34 18.4 118 27.3 2.1 1 mi. NNW of San Fernando 5/ 7 11:27 pm 35 47.5 117 40.3 2.3 11 mi. N of Ridgecrest 5/ 8 11:19 am 34 21.9 118 39.0 2.3 5 mi. SW of Magic Mtn. 5/ 8 11:28 am 34 22.3 118 38.4 2.1 4 mi. SW of Magic Mtn. 5/ 8 4:54 pm 34 23.7 116 27.2 3.0 19 mi. N of Yucca Valley; FELT 5/ 9 12:58 am 34 18.8 116 27.6 2.4 13 mi. N of Yucca Valley 5/ 9 3:38 am 34 17.1 118 33.1 2.0 3 mi. NNW of Northridge 5/ 9 10:15 am 35 12.1 119 18.8 2.7 8 mi. ENE of Taft 5/ 9 11:27 am 34 21.7 118 32.8 2.1 1 mi. SW of Newhall 5/ 9 1:37 pm 34 3.3 116 23.7 2.2 5 mi. SSE of Yucca Valley 5/ 9 1:51 pm 34 3.3 116 23.7 2.2 " 5/ 9 2:01 pm 34 19.8 118 27.3 2.8 3 mi. NNW of San Fernando 5/ 9 2:38 pm 34 23.2 116 27.9 2.2 18 mi. N of Yucca Valley 5/ 9 3:45 pm 35 56.3 118 20.7 2.8 21 mi. NNE of the town of Lake Isabella 5/ 9 4:45 pm 34 19.8 118 27.5 3.2 3 mi. NNW of San Fernando; FELT 5/ 9 5:57 pm 34 19.2 118 27.4 2.2 " 5/ 9 7:52 pm 35 20.5 118 38.3 2.0 14 mi. NE of Arvin 5/10 12:57 am 34 7.4 116 24.7 2.5 1 mi. E of Yucca Valley 5/10 7:15 am 35 2.3 117 0.1 2.2 10 mi. N of Barstow 5/10 9:20 am 34 59.0 116 57.1 2.1 7 mi. NNE of Barstow 5/10 10:47 am 34 33.5 116 26.7 2.2 30 mi. N of Yucca Valley 5/10 7:52 pm 34 7.0 116 59.6 2.4 8 mi. SE of Running Springs 5/10 10:20 pm 34 19.6 118 26.2 2.2 3 mi. N of San Fernando 5/10 10:40 pm 35 2.4 117 0.5 2.0 10 mi. N of Barstow 5/11 7:20 pm 34 19.2 118 27.4 2.2 2 mi. NNW of San Fernando 5/11 7:22 pm 34 17.6 118 27.5 2.1 1 mi. NW of San Fernando 5/11 11:13 pm 34 23.0 116 28.4 2.0 18 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.