March 2, 1995 Weekly Earthquake Report for Southern California ------------------------------------------------ February 23 - March 1, 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, February 23, Pacific Standard Time, to midnight Wednesday night, March 1, 1995, Pacific Standard Time. We recorded 281 earthquakes of M1.0 or larger during the 7-day period covered. The largest quakes this week were also the most widely felt. A pair of M3.7's occurred 20 seconds apart early Wednesday morning, about 11 miles W of Palos Verdes Point. They were felt in the South Bay and West L.A. areas, as well as San Fernando Valley. They were followed by four aftershocks ranging from 2.0 to 2.8 within the next four minutes. As regular readers of this Report know, the offshore region, known as the Continental Borderland, is a fairly active area, so these quakes were no surprise. They were not aftershocks of any previous quake. Two quakes near Yucca Valley (a M3.2 and a M3.0) were felt on Monday morning. These two were Landers aftershocks. Although the two active aftershock zones, Northridge and Landers, are both still very clear on the seismicity map, these two were the only events this week of any significance. Also, a small quake (M2.5) in the Santa Ana Mtns. was lightly felt last night. Like the offshore quakes, it was part of our routine seismic activity and not an aftershock. 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 ------------------------------------------------------------- 2/23 12:37 am 34 37.6 116 36.2 2.1 23 mi. ENE of Lucerne Valley 2/23 4:58 am 35 16.1 118 34.1 2.0 11 mi. NW of Tehachapi 2/23 1:02 pm 33 58.4 118 27.2 2.1 Under Marina del Rey 2/23 3:48 pm 36 12.4 118 20.4 2.5 19 mi. WSW of Olancha 2/23 5:25 pm 36 13.4 118 20.6 2.6 " 2/23 7:26 pm 33 56.2 116 39.7 2.5 7 mi. E Cabazon 2/23 10:51 pm 34 28.1 116 33.2 2.1 22 mi. NE of Big Bear City 2/24 2:58 am 34 14.0 116 26.6 2.3 7 mi. N of Yucca Valley 2/24 9:41 am 36 3.9 117 51.0 2.5 5 mi. ENE of Coso Junction 2/24 9:41 am 34 18.7 116 26.3 2.0 13 mi. N of Yucca Valley 2/24 10:12 am 34 2.3 118 54.6 2.4 1 mi. E of Leo Carrillo State Beach 2/24 1:46 pm 34 1.8 117 6.7 2.1 4 mi. ESE of Redlands 2/25 12:39 am 34 0.1 118 9.8 2.0 City of Commerce, 4 mi. S of the I10/I710 interchange 2/25 3:14 am 34 22.1 116 28.3 2.0 17 mi. N of Yucca Valley 2/25 7:48 am 34 16.5 116 47.8 2.4 3 mi. ENE of Big Bear City 2/25 8:34 am 32 50.6 118 18.4 2.9 2 mi. NE of San Clemente Is. 2/25 6:24 pm 34 18.4 116 26.5 2.2 13 mi. N of Yucca Valley 2/25 10:04 pm 36 4.0 117 51.2 2.2 5 mi. ENE of Coso Junction 2/25 11:22 pm 34 48.5 120 10.9 2.0 14 mi. N of Solvang 2/26 3:10 am 33 41.0 116 43.3 2.3 4 mi. S of Idyllwild 2/26 9:21 am 34 15.2 118 28.1 2.2 2 mi. SW of San Fernando 2/26 9:21 am 32 38.9 115 53.5 2.0 8 mi. SE of Ocotillo 2/26 12:02 pm 34 22.6 116 27.6 3.2 17 mi. N of Yucca Valley 2/26 12:08 pm 34 22.8 116 27.3 2.0 " 2/26 3:21 pm 34 48.8 116 7.2 2.0 31 mi. S of Baker 2/27 4:28 am 34 19.3 116 28.9 2.0 14 mi. N of Yucca Valley 2/27 5:49 am 34 58.4 116 58.9 2.3 6 mi. NNE of Barstow 2/27 8:36 am 34 3.1 116 26.1 3.2 4 mi. S of Yucca Valley FELT 2/27 10:05 am 34 4.0 116 22.5 2.5 5 mi. SE of Yucca Valley 2/27 10:53 am 34 3.1 116 26.2 3.0 4 mi. S of Yucca Valley FELT 2/27 10:59 am 33 57.0 119 58.1 2.2 8 mi. SSW of Santa Cruz Is. 2/27 12:30 pm 33 39.9 116 45.2 2.2 5 mi. SSW of Idyllwild 2/28 12:12 am 33 58.6 116 38.3 2.1 7 mi. W of Desert Hot Springs 2/28 3:36 am 35 39.8 117 37.7 2.1 3 mi. NE of Ridgecrest 2/28 7:36 am 34 0.5 117 0.9 2.7 5 mi. NNW of Beaumont 2/28 9:09 am 33 11.7 115 34.3 2.0 4 mi. SW of Niland 2/28 9:25 am 34 34.5 116 35.0 2.0 22 mi. ENE of Lucerne Valley 2/28 11:43 am 34 24.9 116 28.6 2.0 20 mi. N of Yucca Valley 2/28 11:56 am 34 33.9 116 31.7 2.2 25 mi. ENE of Lucerne Valley 2/28 11:05 pm 34 16.4 118 27.9 2.2 1 mi. WSW of San Fernando 3/1 2:49 am 36 3.8 117 51.0 2.1 5 mi. ENE of Coso Junction 3/1 3:09 am 35 21.2 118 36.9 2.2 15 mi. NE of Arvin 3/1 3:43 am 34 0.5 117 10.9 2.2 3 mi. S of Redlands 3/1 3:47 am 34 57.6 116 56.5 2.0 6 mi. NE of Barstow 3/1 5:49 am 34 20.4 116 28.0 2.1 15 mi. N of Yucca Valley 3/1 7:56 am 33 44.7 118 36.8 3.7 11 mi. W of Palos Verdes Point; FELT 3/1 7:56 am 33 45.2 118 36.0 3.7 (20 sec later) " FELT 3/1 7:58 am 33 44.8 118 37.8 2.0 " 3/1 7:58 am 33 44.6 118 36.6 2.8 " 3/1 7:59 am 33 44.9 118 36.4 2.6 " 3/1 7:59 am 33 45.2 118 36.5 2.2 " 3/1 11:18 am 34 18.1 116 27.0 2.0 12 mi. N of Yucca Valley 3/1 2:57 pm 34 2.3 117 31.2 2.3 2 mi. SE of the I10/I15 interchange 3/1 9:13 pm 33 44.6 117 29.9 2.5 Santa Ana Mtns., 9 mi. SSE of Corona; FELT 3/1 11:09 pm 34 9.8 116 26.5 2.3 3 mi. N of Yucca Valley -------------------------------------------------------------