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 minor earthquake of magnitude 3.4, 2 miles SW of Orinda, CA at 07:34 PM UTC Wednesday, 03 01, 2006 (11:34 AM PST Wednesday, Mar 01, 2006).
The largest event to occur this week in this region was a minor earthquake of magnitude 3.4, 2 miles SW of Orinda, CA at 07:34 PM UTC Wednesday, 03 01, 2006 (11:34 AM PST Wednesday, Mar 01, 2006).
The largest event to occur this week in this region was a microearthquake of magnitude 2.0, 7 miles SW of Toms Place, CA at 05:19 PM UTC Friday, 02 24, 2006 (09:19 AM PST Friday, Feb 24, 2006).
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 2006 FEB 23 1005 8.69 40 33.25 123 50.10 24.56 14 .17 .6 1.4 EUR 2.4D 93 14 XX 2006 FEB 23 1510 38.93 38 49.60 122 48.23 4.77 40 .05 .1 .3 GEY 3.2L 33 2 AA 2006 FEB 23 1758 18.10 38 49.34 122 48.46 4.37 32 .04 .1 .3 GEY 2.1D 36 2 AA 2006 FEB 23 1859 55.76 39 14.23 122 3.27 14.78 23 .21 .6 1.0 SAC 2.0D 58 18 AA 2006 FEB 24 0707 55.97 37 48.79 122 4.13 13.17112 .14 .2 .2 CON 2.4D 37 1 AN 2006 FEB 24 0744 39.39 37 48.59 122 4.40 12.72101 .15 .2 .3 CON 2.5D 37 1 AN 2006 FEB 24 1719 24.48 37 29.06 118 45.34 9.74 37 .05 .3 .9 WCN 2.0D 98 11 QQ 2006 FEB 24 2354 47.45 40 13.78 121 10.04 0.02 52 .14 .3 1.0 ALM # 3.2L 112 29 WW 2006 FEB 24 2357 2.45 40 14.21 121 9.79 5.69 33 .12 .3 1.8 ALM 2.5D 114 28 AA 2006 FEB 25 0219 51.86 37 11.75 118 15.75 12.62 37 .06 .4 .7 OWV 2.6D 145 16 QI 2006 FEB 25 0753 10.70 36 2.71 120 36.56 5.49 57 .08 .2 .4 SLA 2.5D 59 8 XX 2006 FEB 25 1433 15.48 36 50.93 121 34.82 6.02 70 .09 .1 .3 SJB 2.4D 47 3 NN 2006 FEB 25 2319 21.42 38 49.62 122 48.61 2.18 45 .09 .2 .2 GEY 2.0D 44 0 AA 2006 FEB 25 2321 55.60 36 14.24 120 17.36 11.54 52 .09 .2 .3 COA 2.3D 55 5 KK 2006 FEB 27 1424 40.82 39 43.54 123 4.12 0.01 20 .12 .3 2.2 BAR # 2.0D 51 21 XA 2006 FEB 27 2046 44.71 36 29.84 121 4.31 3.67 25 .06 .2 .4 BIT 2.1D 68 1 NN 2006 FEB 28 0109 55.61 39 0.68 122 48.40 3.40 21 .09 .3 1.1 BAR 2.2D 118 5 AA 2006 FEB 28 0332 42.85 35 40.17 121 5.51 4.71 25 .08 .3 .7 SSM 2.0D 115 6 XX 2006 FEB 28 1939 39.89 37 51.69 122 14.28 9.65 70 .09 .1 .3 HAY 2.3D 23 2 AW 2006 MAR 1 1924 2.03 37 51.61 122 12.25 8.93 79 .10 .1 .2 HAY 2.8D 27 3 WW 2006 MAR 1 1934 52.10 37 51.64 122 12.21 8.81 87 .10 .1 .3 HAY 3.4L 23 3 WW
