SOUTHERN CALIFORNIA SEISMOGRAPHIC NETWORK A Cooperative Project of Caltech and the U.S. Geological Survey January 30, 1997 Weekly Earthquake Report for Southern California ------------------------------------------------ January 23 - 29, 1997 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 818-395-6327. For daily updates, call our Earthquake Information Hotline: 818-395-6977. -------------------------------- This week's Report covers the time period from midnight Thursday morning, January 23, Universal Time (ie. GMT), to midnight Wednesday night, January 29, Universal Time. In local time, the period of coverage is from 4 p.m., January 22, Pacific Standard Time, to 4 p.m., January 29, Pacific Standard Time. We detected and processed 285 earthquakes during the seven-day period covered. There were only two earthquakes above M3 this week, both of them felt and neither of them a Northridge or Landers after- shock. The first one, a M3.2 on Friday morning, was a member of the Coso sequence. The other one, a M3.1, occurred 45 minutes later in the Cajon Pass area. The two were, of course, unrelated. Table 1 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 ------------------------------------------------------------- 1/22 5:24 pm 36 4.6 117 39.3 2.2 16 mi. E of Coso Junction 1/23 5:16 am 36 4.6 117 38.0 2.1 " 1/23 2:03 pm 35 49.9 116 48.0 2.1 28 mi. SE of Telescope Peak 1/23 4:05 pm 33 11.7 115 33.8 2.0 3 mi. SW of Niland 1/23 7:23 pm 33 11.8 115 33.4 2.0 " 1/23 10:11 pm 34 58.9 116 57.1 2.3 7 mi. NNE of Barstow 1/24 12:46 am 35 16.6 118 33.6 2.2 11 mi. NNW of Tehachapi 1/24 4:48 am 33 27.9 116 24.5 2.0 14 mi. N of Borrego Springs 1/24 8:10 am 36 6.1 118 13.7 2.8 16 mi. WNW of Coso Junction 1/24 9:42 am 36 6.0 118 13.7 3.2 " FELT 1/24 10:15 am 36 6.1 118 13.5 2.2 " 1/24 10:27 am 34 13.4 117 25.8 3.1 1 mi. W of Devore FELT 1/24 3:01 pm 36 5.4 117 39.5 2.0 16 mi. E of Coso Junction 1/24 10:30 pm 33 50.9 118 35.9 2.0 11 mi. WNW of Palos Verdes Point 1/25 5:26 am 36 5.9 118 13.7 2.0 16 mi. WNW of Coso Junction 1/25 11:55 am 33 59.3 116 48.5 2.0 4 mi. NNW of Cabazon 1/25 1:57 pm 34 28.3 116 30.2 2.2 24 mi. N of Yucca Valley 1/25 3:56 pm 35 30.1 116 26.2 2.1 26 mi. NW of Baker 1/25 4:58 pm 35 12.1 117 16.8 2.3 25 mi. NW of Barstow 1/26 12:07 am 36 6.3 118 13.6 2.0 17 mi. SW of Olancha 1/26 12:19 am 36 6.2 118 13.6 2.1 " 1/26 2:43 am 36 6.1 118 13.4 2.7 " 1/26 3:57 am 34 20.1 116 53.1 2.0 5 mi. NNW of Big Bear City 1/26 4:08 am 36 6.3 118 13.9 2.0 17 mi. SW of Olancha 1/26 4:48 am 34 20.4 116 28.2 2.7 15 mi. N of Yucca Valley 1/26 8:53 am 34 7.4 116 54.6 2.1 5 mi. WNW of Mt. San Gorgonio 1/26 9:17 am 36 6.1 118 13.5 2.0 17 mi. SW of Olancha 1/26 9:20 am 36 5.8 118 13.3 2.0 " 1/26 10:04 am 36 6.3 118 13.7 2.3 " 1/26 10:14 am 36 6.8 118 13.9 2.1 " 1/26 9:09 pm 36 4.5 117 39.5 2.5 16 mi. E of Coso Junction 1/27 5:03 am 34 21.4 118 44.2 2.0 5 mi. NNW of Simi Valley 1/27 7:52 am 34 21.5 118 44.1 2.5 " 1/27 4:15 pm 36 3.7 117 38.5 2.4 17 mi. E of Coso Junction 1/27 5:56 pm 34 0.9 117 0.3 2.3 2 mi. SE of Yucaipa 1/28 7:19 am 34 59.4 116 56.8 2.3 8 mi. NNE of Barstow 1/28 11:21 am 33 25.3 116 23.1 2.4 11 mi. N of Borrego Springs 1/28 1:08 pm 36 4.2 117 38.7 2.2 17 mi. E of Coso Junction 1/28 1:13 pm 36 4.2 117 38.5 2.2 " 1/28 4:16 pm 36 57.7 117 39.9 2.2 33 mi. NE of Lone Pine 1/29 11:33 am 33 14.5 115 41.5 2.4 5 mi. NNW of Obsidian Butte -------------------------------------------------------------