This report provides a brief summary of earthquake activity recorded by the U.S. Geological Survey Northern California Seismic Network in Menlo Park and the University of California Berkeley Seismological Laboratory. It is automatically generated each Wednesday shortly after midnight, Universal time (UT). UT (ie., Greenwich Mean Time) is 8 hours ahead of PST or 7 hours ahead of PDT.
Because it is not possible to review all of the earthquakes before this report is generated, it may contain errors. Please report errors or provide suggestions and comments to ncsn@andreas.wr.usgs.gov
Information about seismicity for other regions is available from the U.S. Geological Survey Earthquake Hazards Program Website. In addition, all earthquake data can be retrieved from the Northern California Earthquake Data Center.
Please note that some of the earthquake data in this report have been reviewed by seismic analysts. Consequently, the parameters that describe the hypocenter, magnitude, origin time, and solution statistics may differ slightly from the information provided at the Northern California Maps of Recent Earthquake Activity website. The differences reflect revised arrival times at seismic stations and the analysts' decisions to include or exclude information from seismic stations.
The minimum magnitude ( M) values in the following bullets reflect the smallest earthquake which the network can routinely record within the region. During the previous seven-day period ending at midnight (UT) Wednesday, our seismic networks recorded
The largest event to occur this week in this region was a light earthquake of magnitude 4.4, 20 miles WSW of Patterson, CA at 06:43 PM UTC Saturday, 02 05, 2005 (10:43 AM PST Saturday, Feb 05, 2005).
The largest event to occur this week in this region was a light earthquake of magnitude 4.4, 20 miles WSW of Patterson, CA at 06:43 PM UTC Saturday, 02 05, 2005 (10:43 AM PST Saturday, Feb 05, 2005).
The largest event to occur this week in this region was a microearthquake of magnitude 1.2, 8 miles WSW of Toms Place, CA at 11:37 AM UTC Saturday, 02 05, 2005 (03:37 AM PST Saturday, Feb 05, 2005).
The following table provides a listing of all M >2 earthquakes that occurred this week. An explanation of the entries in the table is available.
---ORIGIN TIME (UT)--- -LAT N-- --LON W-- DEPTH N RMS ERH ERZ LOC PREF AZ MIN S. PAGE 1 YEAR MON DA HRMN SEC DEG MIN DEG MIN KM RD SEC KM KM REMKS MAG GAP DS PF 2005 FEB 3 1325 22.30 41 10.51 121 58.66 7.66 20 .09 .2 2.6 SHA 2.1D 54 20 XX 2005 FEB 3 1537 13.37 35 33.94 120 47.40 5.48 39 .07 .3 .9 SSM 2.2D 64 11 XX 2005 FEB 3 1613 19.88 35 55.34 120 28.18 5.36 53 .07 .1 .2 MID 2.8D 43 4 XX 2005 FEB 3 1812 55.30 35 41.57 121 8.35 6.55 54 .08 .2 .4 SSM 3.2L 89 2 XW 2005 FEB 4 0554 41.91 35 33.94 120 47.36 5.68 50 .07 .2 1.4 ROB 2.1D 64 11 XX 2005 FEB 4 1552 46.62 40 12.89 123 7.38 37.79 21 .08 .3 1.1 KLA 2.2D 63 23 XX 2005 FEB 4 1731 6.18 35 53.85 120 26.33 5.81 46 .07 .2 .3 GOL 2.2D 51 4 XX 2005 FEB 4 2327 40.34 38 53.35 123 35.87 0.02 44 .47 1.2 3.2 PAR # 3.1L 215 9 AA 2005 FEB 5 0736 32.17 35 41.85 120 58.74 11.45 26 .22 .8 1.3 SSM 2.1D 201 12 WW 2005 FEB 5 1558 1.40 36 49.56 121 33.20 5.82 41 .09 .2 .3 SJB 2.0D 36 3 NN 2005 FEB 5 1843 30.41 37 23.68 121 29.20 7.01 93 .13 .2 .5 HAM 4.4L 67 7 WW 2005 FEB 6 1052 0.75 35 47.13 120 20.13 8.80 51 .05 .2 .3 GOL 2.1D 42 1 XX 2005 FEB 6 1730 34.18 39 12.51 122 41.00 7.80 13 .05 .3 1.1 BAR 2.2D 63 13 WW 2005 FEB 6 1736 44.82 38 46.94 122 45.57 1.06 39 .06 .1 .2 GEY 2.7D 30 4 AA 2005 FEB 6 2050 25.07 35 33.64 120 53.07 7.41 55 .05 .2 .6 SSM 2.8D 79 9 XN 2005 FEB 6 2147 14.69 40 12.66 123 7.49 39.08 11 .07 .8 1.8 KLA 99 24 XX 2005 FEB 7 0021 58.23 36 47.95 121 31.24 7.15 63 .08 .1 .2 SJB 2.2D 35 3 NN 2005 FEB 7 0515 20.24 35 43.18 121 3.72 6.34 49 .06 .2 .4 SSM 2.2D 65 9 XX 2005 FEB 7 2322 59.88 37 23.49 121 28.81 7.64 67 .08 .1 .3 HAM 2.3D 69 7 NN 2005 FEB 8 0038 2.91 35 32.40 121 16.86 3.39 46 .09 .5 .9 SSM 2.6D 220 20 XX 2005 FEB 8 0509 42.02 36 36.18 121 12.66 6.93 38 .04 .1 .4 PIN 2.1D 42 4 WW 2005 FEB 8 1019 10.00 39 20.18 122 54.37 5.81 22 .09 .3 1.5 BAR 2.1D 66 18 WW 2005 FEB 8 1310 33.62 36 50.69 121 34.55 4.92 56 .11 .2 .3 SJB 2.7D 64 2 WW 2005 FEB 8 1858 35.67 39 20.30 123 10.49 0.02 28 .08 .2 1.0 MAA # 2.4D 79 18 WW 2005 FEB 8 1921 45.55 39 20.00 123 11.03 0.02 14 .12 .4 2.0 MAA # 2.1D 80 17 WW 2005 FEB 8 2127 12.12 35 43.70 121 3.53 5.89 25 .08 .4 .7 SSM 2.3D 144 11 WW 2005 FEB 8 2200 48.89 35 57.13 120 30.35 9.66 56 .07 .2 .2 MID 3.5L 39 1 WW 2005 FEB 9 2204 10.13 37 2.46 119 17.28 31.83 32 .10 .6 1.4 KAI 2.6D 165 55 WW 2005 FEB 9 2333 45.39 35 43.06 121 2.92 5.70 57 .09 .4 .8 SSM 2.8D 162 19 WW
