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 3.8, 12 miles SW of Toms Place, CA at 09:54 PM UTC Friday, 09 29, 2006 (02:54 PM PDT Friday, Sep 29, 2006).
The largest event to occur this week in this region was a microearthquake of magnitude 2.0, 1 miles ENE of Union City, CA at 03:23 PM UTC Thursday, 09 28, 2006 (08:23 AM PDT Thursday, Sep 28, 2006).
The largest event to occur this week in this region was a minor earthquake of magnitude 3.8, 12 miles SW of Toms Place, CA at 09:54 PM UTC Friday, 09 29, 2006 (02:54 PM PDT Friday, Sep 29, 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 SEP 28 0716 33.50 38 47.42 122 46.53 0.80 48 .07 .1 .2 GEY 2.6D 36 1 AA 2006 SEP 28 1503 49.24 38 49.06 122 47.41 3.63 44 .11 .2 .3 GEY 2.3D 44 1 AA 2006 SEP 28 1523 39.83 37 36.26 122 0.18 5.38 57 .11 .1 .3 HAY 2.0D 29 3 AW 2006 SEP 28 1838 49.23 38 49.77 122 48.50 2.26 43 .08 .2 .2 GEY 2.1D 38 2 AA 2006 SEP 28 2236 20.17 39 37.36 123 26.10 5.59 28 .11 .3 .6 MAA 2.5D 135 21 AA 2006 SEP 29 0722 54.04 36 3.02 120 3.16 9.81 37 .19 .5 .3 COA 2.4D 157 5 WW 2006 SEP 29 2154 9.46 37 26.96 118 50.55 8.92 47 .06 .3 .8 MOR 3.8L 79 11 IW 2006 SEP 29 2159 45.75 38 48.36 122 47.35 1.81 43 .11 .2 .3 GEY 2.3D 34 1 AA 2006 SEP 30 0231 45.63 38 56.43 123 16.86 0.31 13 .05 .3 2.0 PAR 2.1D 75 8 WW 2006 SEP 30 0333 54.44 40 33.16 122 19.72 19.65 11 .04 .6 1.1 SHA 2.3D 99 34 WW 2006 SEP 30 0503 48.32 39 27.67 123 6.83 0.03 34 .18 .3 2.0 BAR # 2.6D 61 16 WW 2006 SEP 30 0540 45.50 36 6.04 120 13.48 12.01 15 .06 .2 .5 COA 2.1D 85 11 WW 2006 SEP 30 0554 5.64 36 7.12 120 14.08 8.63 24 .23 .3 .7 COA 2.3D 76 13 WW 2006 SEP 30 0727 14.09 39 27.69 123 6.35 6.38 12 .04 .3 1.5 BAR 2.0D 97 16 WW 2006 SEP 30 1450 57.52 38 45.75 122 46.27 11.48 17 .37 4.0 9.6 GEY 2.0G 184 1 Y 2006 SEP 30 1856 37.48 39 27.66 123 6.94 3.63 16 .05 .2 1.8 BAR 2.2D 61 16 WW 2006 SEP 30 1857 3.24 39 27.66 123 6.73 1.26 9 .05 .3 9.0 BAR - 2.0D 134 13 WW 2006 SEP 30 2132 18.15 38 49.02 122 47.80 3.23 49 .07 .2 .3 GEY 2.6D 39 1 WW 2006 OCT 1 0540 36.90 39 27.69 123 6.44 5.62 31 .08 .2 .8 BAR 2.5D 45 13 AA 2006 OCT 1 1223 31.75 39 27.61 123 6.72 2.84 17 .04 .2 1.7 BAR 2.2D 60 13 WW 2006 OCT 1 1307 22.11 39 27.63 123 6.66 6.60 21 .04 .2 1.5 BAR 2.3D 60 13 WW 2006 OCT 1 1514 40.10 35 43.04 121 5.20 6.25 48 .09 .2 .4 SSM 2.2D 84 7 AA 2006 OCT 1 1816 57.12 39 27.41 123 6.74 4.31 32 .08 .2 .9 BAR 2.6D 47 13 AA 2006 OCT 1 2227 14.16 38 50.26 122 45.75 1.40 33 .07 .2 .3 GEY 2.1D 43 0 YW 2006 OCT 2 1454 22.65 40 58.21 121 39.85 15.29 10 .04 .4 3.4 SHA 2.0D 95 27 WW 2006 OCT 2 2206 4.59 39 27.74 123 6.34 4.45 43 .19 .3 1.2 BAR 2.9D 61 15 WW 2006 OCT 3 1118 25.04 35 34.83 120 52.06 7.00 31 .15 .3 .9 SSM 2.1D 59 6 WW 2006 OCT 3 1815 32.18 40 50.39 122 13.21 24.14 12 .43 1.7 2.4 SHA 2.5D 130 46 WW
