SOUTHERN CALIFORNIA SEISMOGRAPHIC NETWORK A Cooperative Project of Caltech and the U.S. Geological Survey June 1, 1995 Weekly Earthquake Report for Southern California ------------------------------------------------ May 25 - 31, 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, May 25, Pacific Daylight Time, to midnight Wednesday night, May 31, 1995, Pacific Daylight Time. We recorded 242 earthquakes of M1.0 or larger during the 7-day period covered. It was another week of routine seismicity. There were two quakes above M3, both of which were felt. One was an aftershock, the other was not. The Northridge aftershock, M3.1 early last Thursday morning, occurred near the eastern edge of the aftershock zone, near San Fernando. Like almost all of the Northridge after- shocks, it had a thrust focal mechanism. Early Monday evening, there was a M3.2 near Palomar Mountain, between the San Jacinto and Elsinore Fault zones. It was felt in the Palm Springs and Palm Desert areas. The focal mechanism was strike-slip, with a strike that is somewhat more northerly than either of the above mentioned two major fault zones. 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 ------------------------------------------------------------- 5/25 12:15 am 34 23.7 116 27.7 2.3 19 mi. N of Yucca Valley 5/25 12:29 am 34 11.0 116 26.3 2.3 4 mi. N of Yucca Valley 5/25 4:41 am 34 34.0 116 34.4 2.3 22 mi. ENE of Lucerne Valley 5/25 5:23 am 34 16.5 118 27.5 3.1 1 mi. WSW of San Fernando FELT 5/25 5:50 am 34 8.6 116 26.0 2.1 1 mi. NNE of Yucca Valley 5/25 11:51 am 34 17.3 118 32.5 2.2 3 mi. N of Northridge 5/25 5:28 pm 34 1.5 117 14.1 2.0 3 mi. WSW of Redlands 5/25 10:30 pm 35 5.4 117 26.6 2.3 27 mi. WNW of Barstow 5/26 11:34 pm 34 21.4 118 39.7 2.2 6 mi. NNE of Simi Valley 5/27 5:11 am 33 55.5 116 20.0 2.0 10 mi. ESE of Desert Hot Springs 5/27 11:18 am 34 20.4 118 30.3 2.4 2 mi. SSE of Newhall 5/27 3:02 pm 33 46.5 116 8.3 2.6 6 mi. NE of Indio 5/27 5:14 pm 32 36.5 117 44.9 2.5 33 mi. WSW of La Jolla 5/27 10:50 pm 34 38.2 116 31.4 2.1 27 mi. ENE of Lucerne Valley 5/28 2:10 am 34 10.5 116 24.6 2.0 4 mi. NNE of Yucca Valley 5/28 9:20 am 34 30.8 116 38.0 2.1 18 mi. ENE of Lucerne Valley 5/28 9:20 am 34 33.6 116 32.2 2.0 24 mi. ENE of Lucerne Valley 5/29 1:07 am 34 29.6 120 47.5 2.1 9 mi. SW of Pt. Arguello 5/29 4:41 am 34 37.2 118 37.6 2.1 7 mi. NNW of Castaic Lake 5/29 8:19 am 34 22.1 116 28.0 2.4 17 mi. N of Yucca Valley 5/29 6:02 pm 33 58.3 116 21.0 2.4 8 mi. E of Desert Hot Springs 5/29 6:44 pm 33 30.0 116 49.5 3.2 10 mi. NNE of Palomar Observatory; FELT 5/29 6:47 pm 35 55.6 117 40.1 2.4 17 mi. ESE of Coso Junction 5/29 10:12 pm 36 7.0 117 51.8 2.5 Coso Range, 4 mi. ESE of Haiwee Reservoir 5/30 10:06 am 32 41.2 115 56.0 2.0 4 mi. SE of Ocotillo 5/30 6:53 pm 34 2.5 116 21.6 2.0 7 mi. SE of Yucca Valley 5/30 9:19 pm 34 54.6 116 55.0 2.1 6 mi. ENE of Barstow 5/30 9:38 pm 33 46.6 116 7.7 2.2 6 mi. NE of Indio 5/31 9:19 am 35 57.5 117 23.2 2.5 13 mi. N of Trona 5/31 3:32 pm 33 46.5 116 7.7 2.4 6 mi. NE of Indio 5/31 3:33 pm 34 19.9 117 3.9 2.0 8 mi. NNE of Running Springs 5/31 8:00 pm 34 19.9 116 27.4 2.2 14 mi. N of Yucca Valley -------------------------------------------------------------