SOUTHERN CALIFORNIA SEISMOGRAPHIC NETWORK A Cooperative Project of Caltech and the U.S. Geological Survey May 4, 1995 Weekly Earthquake Report for Southern California ------------------------------------------------ April 27 - May 3, 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 27, Pacific Daylight Time, to midnight Wednesday night, May 3, 1995, Pacific Daylight Time. We recorded 273 earthquakes of M1.0 or larger during the 7-day period covered. The largest, and most widely felt, quake this wee was part of a small cluster in the Inglewood area yesterday (Wednesday) afternoon. This sequence included a M3.1 in the early afternoon and a M2.8 at the same location at 5 pm. Both occurred near the comlicated Newport-Inglewood Fault zone, and both showed strike-slip mechanisms consistent with that zone's north-northwesterly strike. Both of them were felt, the M3.1 as far away as downtown L.A. As the map shows, there were a number of other very small quakes in Los Angeles County. The only other one to be felt, however, was a M2.3 in the Long Beach area last Thursday evening, which was felt by a Seismo Lab staff member. 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 ------------------------------------------------------------- 4/27 7:10 pm 34 34.8 116 35.4 2.1 22 mi. ENE of Lucerne Valley 4/27 7:56 pm 33 46.7 118 7.7 2.3 2 mi. ENE of downtown Long Beach; FELT 4/27 8:02 pm 34 22.5 116 28.0 2.0 17 mi. N of Yucca Valley 4/28 12:44 am 34 22.9 116 27.8 2.1 " 4/28 1:07 am 34 20.0 118 37.4 2.1 6 mi. SSW of Magic Mtn. 4/28 3:01 pm 33 15.0 118 19.8 2.4 6 mi. S of Avalon, Catalina Island 4/28 3:09 pm 33 57.7 116 22.2 2.0 7 mi. E of Desert Hot Springs 4/28 5:16 pm 36 9.7 118 13.4 2.7 14 mi. SW of Olancha 4/28 9:02 pm 33 54.7 117 4.7 2.2 5 mi. W of Beaumont 4/29 8:02 am 34 23.0 116 27.3 2.8 18 mi. N of Yucca Valley 4/29 11:27 am 34 20.9 116 28.0 2.0 15 mi. N of Yucca Valley 4/29 2:19 pm 36 9.5 118 13.3 2.5 14 mi. SW of Olancha 4/29 2:26 pm 33 27.5 116 32.5 2.4 10 mi. SE of Anza 4/29 2:53 pm 34 15.1 118 36.0 2.0 3 mi. N of Canoga Park 4/29 2:56 pm 34 21.3 118 37.5 2.0 5 mi. SSW of Magic Mtn. 4/30 3:55 am 34 15.6 116 24.2 2.1 10 mi. NNE of Yucca Valley 4/30 6:53 am 33 4.3 116 35.8 2.1 Under Julian 4/30 7:49 am 34 17.5 118 27.8 2.1 1 mi. WNW of San Fernando 4/30 10:27 am 35 59.6 117 41.4 2.3 14 mi. ESE of Coso Junction 4/30 1:25 pm 34 19.0 118 36.8 2.0 5 mi. ENE of Simi Valley 4/30 2:23 pm 33 7.5 115 38.0 2.2 6 mi. N of Westmorland 4/30 4:47 pm 34 23.2 116 27.3 2.0 18 mi. N of Yucca Valley 4/30 5:13 pm 33 48.6 116 56.8 2.1 4 mi. NNE of Hemet 4/30 7:28 pm 33 59.4 117 0.1 2.0 4 mi. NNW of Beaumont 5/1 9:34 am 34 16.8 118 34.7 2.2 3 mi. NW of Northridge 5/1 2:51 pm 33 58.8 116 18.7 2.5 10 mi. E of Desert Hot Springs 5/1 4:42 pm 34 26.0 116 31.9 2.0 22 mi. NNW of Yucca Valley 5/1 10:29 pm 34 22.5 116 28.5 2.2 17 mi. N of Yucca Valley 5/1 11:17 pm 33 17.2 116 7.6 2.2 9 mi. N of Ocotillo Wells 5/2 4:29 am 33 35.4 118 18.0 2.4 7 mi. S of Pt. Fermin, San Pedro 5/2 10:54 am 34 19.6 116 28.8 2.1 14 mi. N of Yucca Valley 5/2 11:15 am 36 3.0 117 31.1 2.6 20 mi. S of Panamint Springs 5/2 11:13 pm 36 2.6 117 31.3 2.5 " 5/3 10:20 am 35 36.4 118 22.2 2.0 5 mi. ESE of the town of Lake Isabella 5/3 12:32 pm 33 57.0 118 22.4 3.1 2 mi. W of Hollywood Park Racetrack; FELT 5/3 4:23 pm 33 57.1 118 22.4 2.0 " 5/3 5:00 pm 33 57.0 118 22.5 2.8 " FELT 5/3 6:32 pm 34 23.0 117 24.7 2.0 11 mi. N of the I15/I215 interchange in Cajon Pass 5/3 6:43 pm 35 59.7 117 41.2 2.7 15 mi. ESE of Coso Junction -------------------------------------------------------------