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 microearthquake of magnitude 2.9, 7 miles NNE of Cambria, CA at 09:09 PM UTC Monday, 06 01, 2009 (02:09 PM PDT Monday, Jun 01, 2009).
The largest event to occur this week in this region was a microearthquake of magnitude 2.8, 9 miles WNW of Rio Vista, CA at 01:02 AM UTC Tuesday, 06 02, 2009 (06:02 PM PDT Monday, Jun 01, 2009).
The largest event to occur this week in this region was a microearthquake of magnitude 2.2, 2 miles W of Toms Place, CA at 12:10 PM UTC Wednesday, 05 27, 2009 (05:10 AM PDT Wednesday, May 27, 2009).
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 2009 MAY 27 0031 52.65 37 39.98 122 30.23 9.48 93 .09 .1 .2 2.2D 96 2 2009 MAY 27 0308 8.23 39 29.41 123 6.83 3.99 29 .06 .1 .7 2.5D 43 10 2009 MAY 27 1210 54.03 37 33.47 118 42.88 10.41 25 .09 .3 1.2 2.2D 87 11 2009 MAY 28 1523 15.58 37 28.67 121 49.76 7.77 64 .06 .1 .4 2.0D 32 4 2009 MAY 28 2001 21.09 37 28.56 121 49.79 7.84 67 .08 .1 .4 2.1D 29 4 2009 MAY 28 2058 6.65 38 49.30 122 49.50 2.33 46 .07 .1 .2 2.2D 34 1 2009 MAY 29 1751 39.87 38 46.38 122 44.70 2.10 45 .07 .2 .2 2.3D 40 1 2009 MAY 29 2132 58.63 37 39.75 122 30.40 9.72 65 .08 .2 .3 2.3D 99 3 2009 MAY 29 2210 55.64 36 29.33 121 3.82 2.41 56 .09 .1 .3 2.4D 73 3 2009 MAY 30 0729 0.13 38 57.30 122 37.64 3.65 61 .13 .2 .7 2.5D 48 4 2009 MAY 30 1634 30.72 38 46.01 122 42.93 1.91 48 .08 .1 .2 2.2D 55 1 2009 MAY 30 2115 44.03 40 41.49 121 29.47 10.71 13 .06 .3 1.2 2.4D 138 14 2009 MAY 31 0510 12.22 39 37.81 123 24.70 5.17 25 .08 .2 .3 2.3D 88 2 2009 JUN 1 1846 44.36 35 39.44 121 0.77 7.70 57 .11 .2 .4 2.2D 53 2 2009 JUN 1 2109 13.83 35 39.33 121 0.89 7.90 72 .09 .1 .4 2.9D 54 3 2009 JUN 1 2205 43.25 35 39.47 121 0.78 7.89 66 .08 .1 .4 2.4D 53 2 2009 JUN 2 0032 0.13 38 46.44 122 42.79 2.53 59 .10 .1 .2 2.5D 23 0 2009 JUN 2 0102 53.82 38 12.41 121 50.04 21.40 81 .28 .3 .2 2.8D 100 6 2009 JUN 2 0115 26.28 36 37.45 119 17.65 23.20 39 .25 .6 .7 2.4D 75 13 2009 JUN 2 1049 5.00 39 22.54 122 54.37 11.51 38 .15 .3 .7 2.1D 61 13
