February 9, 1995 Weekly Earthquake Report for Southern California ------------------------------------------------ February 2 - 8, 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 2, Pacific Standard Time, to midnight Wednesday night, February 8, 1995, Pacific Standard Time. We recorded 257 earthquakes of M1.0 or larger during the 7-day period covered. It was another quiet week, dominated by Landers/Big Bear and Northridge aftershocks. As we predicted based on the mainshock sizes, the Northridge aftershock sequence is decaying faster than the Landers sequence is and is now at a lower overall level, in spite of the fact that the Northridge quake happened more recently. The largest event of the week happened to be a Northridge aftershock M3.4 very early Wednesday morning. It was felt in the northern San Fernando Valley. In Pasadena, it seems to have been felt only by dogs, who proceded to wake everyone else up. A M2.4 in the same area about two and a half hours earlier was felt by a few people. 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 ------------------------------------------------------------- 2/2 3:59 am 36 38.6 118 12.3 2.3 8 mi. WNW of Lone Pine 2/2 4:04 am 34 36.8 116 30.7 2.0 27 mi. ENE of Lucerne Valley 2/2 2:33 pm 33 48.8 116 11.7 2.2 6 mi. N of Indio 2/2 3:14 pm 33 2.9 117 59.4 2.5 25 mi. NE of San Clemente Is. 2/2 8:37 pm 36 7.3 117 50.2 2.0 Coso Range, 6 mi. E of Haiwee Reservoir 2/2 11:37 pm 36 9.1 119 38.8 2.1 23 mi. WSW of Visalia 2/3 1:18 am 34 22.6 116 27.6 2.1 17 mi. N of Yucca Valley 2/3 8:16 am 36 7.5 117 50.5 2.0 Coso Range, 5 mi. E of Haiwee Reservoir 2/3 2:34 pm 34 47.3 116 17.7 2.4 35 mi. SSW of Baker 2/3 5:51 pm 33 54.2 118 17.9 2.0 Gardena, 3 mi. NNW of the I110/I405 interchange 2/4 7:43 am 34 9.8 116 26.4 2.0 3 mi. N of Yucca Valley 2/4 1:49 pm 33 48.2 116 57.0 2.6 4 mi. NNE of Hemet 2/4 3:58 pm 33 12.8 116 2.0 2.0 5 mi. SW of Salton City 2/4 5:02 pm 34 1.2 116 19.1 2.0 9 mi. SE of Yucca Valley 2/5 12:29 am 34 37.4 116 33.3 2.4 25 mi. ENE of Lucerne Valley 2/5 6:58 am 34 9.0 116 25.5 2.9 2 mi. NNE of Yucca Valley 2/5 5:33 pm 33 53.7 117 39.7 2.4 5 mi. WNW of Corona 2/5 7:35 pm 35 37.5 116 8.0 2.2 25 mi. N of Baker 2/6 5:18 am 34 0.9 116 20.4 2.1 9 mi. SE of Yucca Valley 2/6 8:25 am 34 2.0 116 55.8 2.1 7 mi. NNE of Beaumont 2/6 8:27 am 34 47.5 116 17.4 2.5 34 mi. SSW of Baker 2/6 8:45 am 34 24.7 116 28.5 2.0 20 mi. N of Yucca Valley 2/6 8:51 am 33 11.4 115 35.8 2.1 Obsidian Butte, 5 mi. SW of Niland 2/6 1:46 pm 32 43.2 115 55.3 2.2 4 mi. ESE of Ocotillo 2/6 3:12 pm 34 7.4 116 23.4 2.1 3 mi. E of Yucca Valley 2/7 3:15 am 35 49.0 120 18.3 2.9 6 mi. N of Cholame 2/7 7:02 am 34 22.2 116 28.0 2.6 17 mi. N of Yucca Valley 2/7 7:49 am 33 40.8 116 43.0 2.6 4 mi. S of Idyllwild 2/7 11:43 am 33 41.6 118 26.1 2.1 5 mi. S of Palos Verdes Point 2/7 1:58 pm 34 37.0 116 34.9 2.1 23 mi. ENE of Lucerne Valley 2/7 4:14 pm 34 42.5 120 56.2 2.0 18 mi. WNW of Pt. Arguello 2/7 8:43 pm 34 26.0 116 28.0 2.1 21 mi. N of Yucca Valley 2/7 10:02 pm 34 18.7 118 26.2 2.4 2 mi. N of San Fernando FELT 2/8 12:46 am 34 16.6 118 22.9 3.4 3 mi. E of San Fernando FELT 2/8 5:41 am 34 22.3 118 33.7 2.2 2 mi. WSW of Newhall 2/8 8:36 am 35 55.6 117 40.1 2.2 17 mi. ESE of Coso Junction 2/8 2:37 pm 34 16.6 118 23.4 2.1 2 mi. E of San Fernando 2/8 4:09 pm 35 45.5 120 16.8 2.6 2 mi. NNE of Cholame 2/8 9:34 pm 34 59.3 116 56.9 2.4 8 mi. NNE of Barstow -------------------------------------------------------------