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 4.6, 10 miles NNW of Trinidad, CA at 05:56 AM UTC Sunday, 08 17, 2008 (10:56 PM PDT Saturday, Aug 16, 2008).
The largest event to occur this week in this region was a microearthquake of magnitude 2.3, 3 miles S of Santa Rosa, CA at 10:42 PM UTC Saturday, 08 16, 2008 (03:42 PM PDT Saturday, Aug 16, 2008).
The largest event to occur this week in this region was a microearthquake of magnitude 1.8, 9 miles SW of Toms Place, CA at 07:23 PM UTC Tuesday, 08 19, 2008 (12:23 PM PDT Tuesday, Aug 19, 2008).
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 2008 AUG 13 0318 37.02 38 48.34 122 44.17 2.44 25 .05 .2 .4 2.0D 58 2 2008 AUG 13 0459 43.44 40 24.89 124 11.11 28.32 13 .05 .5 1.2 2.6D 88 5 2008 AUG 13 1634 29.73 40 24.81 124 10.85 27.60 11 .05 .5 1.4 2.1D 98 5 2008 AUG 13 1846 31.13 37 17.99 118 19.64 5.90 22 .06 .5 .6 2.0D 130 8 2008 AUG 14 0621 35.40 35 32.69 120 49.48 3.36 29 .13 .6 1.8 2.4D 94 8 2008 AUG 14 1718 23.95 36 38.13 121 14.77 5.52 39 .04 .1 .4 2.1D 40 4 2008 AUG 14 1832 33.74 38 46.34 122 43.15 2.02 32 .06 .2 .2 2.2D 52 2 2008 AUG 14 2035 36.71 38 49.44 122 47.72 3.34 35 .06 .2 .3 2.2D 78 2 2008 AUG 15 0338 49.26 37 32.24 118 28.26 11.00 39 .06 .2 .5 2.4D 75 3 2008 AUG 15 1121 4.13 40 11.64 122 43.01 0.04 24 .30 .5 2.2 2.9D 62 18 2008 AUG 15 1731 34.70 38 48.49 122 47.46 0.03 14 .07 .4 .9 2.1D 72 7 2008 AUG 15 1852 15.85 40 11.40 122 47.44 10.05 16 .31 .6 1.0 2.7D 54 10 2008 AUG 16 2242 26.62 38 23.64 122 42.91 7.76 76 .12 .1 .3 2.3D 46 5 2008 AUG 17 0359 7.86 37 28.50 121 47.90 6.71 45 .05 .1 .4 2.1D 43 3 2008 AUG 17 0537 11.95 40 11.08 122 47.23 8.86 19 .22 .3 .6 2.6D 54 10 2008 AUG 17 0556 59.37 41 11.31 124 12.96 16.75 15 .06 .5 .4 4.6W 172 17 2008 AUG 17 0906 27.17 41 26.12 121 42.72 2.39 12 .18 .6 5.9 2.2D 131 17 2008 AUG 17 1458 50.09 37 39.69 122 31.38 8.75 44 .07 .2 .3 2.2D 109 5 2008 AUG 17 2057 7.52 38 49.70 122 47.75 1.72 31 .10 .2 .5 2.3D 45 2 2008 AUG 18 1232 16.55 38 57.07 123 1.91 5.60 31 .08 .2 .6 2.5D 59 6 2008 AUG 18 1708 20.91 36 53.28 121 36.78 1.36 10 .12 .4 .7 2.0D 68 2 2008 AUG 18 2012 49.79 35 56.00 119 53.92 9.37 49 .25 .4 1.0 2.1D 142 9 2008 AUG 19 0926 2.38 37 23.75 118 40.64 14.12 44 .05 .3 .7 2.8D 62 3 2008 AUG 19 1059 47.85 37 23.29 118 40.67 15.17 44 .08 .3 .6 3.1L 67 3 2008 AUG 19 1831 35.71 36 41.49 121 19.26 4.48 61 .06 .1 .3 2.9L 27 3 2008 AUG 19 1904 8.00 36 41.54 121 19.44 4.36 52 .06 .1 .3 2.6D 27 3 2008 AUG 19 1944 44.72 36 33.13 121 6.96 8.39 28 .05 .2 .4 2.3D 59 6
