SOUTHERN CALIFORNIA SEISMOGRAPHIC NETWORK A Cooperative Project of Caltech and the U.S. Geological Survey April 27, 1995 Weekly Earthquake Report for Southern California ------------------------------------------------ April 20 - 26, 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, April 20, Pacific Daylight Time, to midnight Wednesday night, April 26, 1995, Pacific Daylight Time. We recorded 243 earthquakes of M1.0 or larger during the 7-day period covered. We had a very quiet week this week. The largest event in our coverage area was a M3.2 in the Big Bear Lake area, last Thursday afternoon. It could well have been felt; however, we did not receive any inquiries. Some might read significance into the quiet, but, just as we say there is no great significance to a week with ten M3+ quakes, there is also no significance to a quiet week. Just random fluctuation. 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 ------------------------------------------------------------- 4/20 2:38 pm 34 18.1 116 54.7 3.2 4 mi. N of town of Big Bear Lake 4/20 9:17 pm 35 38.8 117 39.7 2.4 1 mi. N of Ridgecrest 4/20 10:19 pm 33 29.3 116 29.6 2.1 11 mi. ESE of Anza 4/21 7:26 am 35 2.2 116 59.9 2.3 10 mi. N of Barstow 4/21 11:26 am 34 37.5 116 32.4 2.0 26 mi. ENE of Lucerne Valley 4/21 1:16 pm 34 49.7 116 41.6 2.3 19 mi. ESE of Barstow 4/21 2:33 pm 35 29.6 120 4.1 2.1 10 mi. NNW of Simmler 4/21 5:28 pm 33 12.9 115 38.1 2.0 Obsidian Butte area, 6 mi. WSW of Niland 4/21 7:11 pm 34 18.1 118 27.8 2.2 1 mi. NW of San Fernando 4/22 12:55 am 36 6.7 117 51.3 2.1 5 mi. ESE of Haiwee Reservoir 4/22 11:59 am 35 29.8 120 4.5 2.1 10 mi. NNW of Simmler 4/22 5:37 pm 35 19.5 118 35.5 2.8 15 mi. NNW of Tehachapi 4/22 5:44 pm 34 58.2 116 57.8 2.5 6 mi. NNE of Barstow 4/22 6:48 pm 34 8.4 116 24.7 2.1 2 mi. NE of Yucca Valley 4/22 9:49 pm 34 15.2 118 35.9 2.0 3 mi. N of Canoga Park 4/23 12:52 am 34 20.7 116 28.5 2.2 15 mi. N of Yucca Valley 4/23 6:02 am 33 38.6 116 45.8 2.0 7 mi. SSW of Idyllwild 4/23 2:56 pm 34 15.4 116 49.7 2.0 1 mi. ESE of Big Bear City 4/23 7:52 pm 34 19.5 118 38.6 2.2 4 mi. NE of Simi Valley 4/23 10:27 pm 34 25.2 118 38.3 2.3 2 mi. W of Magic Mtn. 4/24 2:44 am 34 14.9 116 44.2 2.3 6 mi. E of Big Bear City 4/24 3:59 am 34 25.6 116 29.2 2.0 21 mi. N of Yucca Valley 4/24 6:09 am 32 55.3 117 42.0 2.3 26 mi. SW of Oceanside 4/24 2:01 pm 34 51.6 118 45.9 2.2 6 mi. NE of Gorman 4/24 9:01 pm 33 57.9 116 19.5 2.4 10 mi. E of Desert Hot Springs 4/25 1:16 am 35 2.7 119 11.8 2.2 Wheeler Ridge area, 13 mi. W of the I5/99 interchange 4/25 1:18 pm 34 21.5 118 38.3 2.0 5 mi. SSW of Magic Mtn. 4/25 2:48 pm 33 56.8 116 24.0 2.0 5 mi. E of Desert Hot Springs 4/26 6:19 am 34 53.1 116 31.8 2.1 27 mi. E of Barstow 4/26 7:40 am 33 48.4 117 50.3 2.0 4 mi. E of Disneyland 4/26 10:15 pm 33 51.0 117 2.0 2.0 6 mi. SSW of Beaumont -------------------------------------------------------------