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, 8 miles S of Tres Pinos, CA at 11:57 PM UTC Thursday, 06 19, 2008 (04:57 PM PDT Thursday, Jun 19, 2008).
The largest event to occur this week in this region was a microearthquake of magnitude 2.1, 7 miles E of Milpitas, CA at 06:14 PM UTC Saturday, 06 21, 2008 (11:14 AM PDT Saturday, Jun 21, 2008).
The largest event to occur this week in this region was a microearthquake of magnitude 2.3, 9 miles SW of Toms Place, CA at 12:39 AM UTC Thursday, 06 19, 2008 (05:39 PM PDT Wednesday, Jun 18, 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 JUN 18 0330 52.28 38 48.22 122 44.37 2.38 40 .06 .1 .2 2.2D 55 2 2008 JUN 18 1128 40.21 38 48.89 122 48.42 4.36 72 .08 .1 .2 2.8D 23 1 2008 JUN 18 1548 11.09 38 49.11 122 49.20 2.73 55 .07 .1 .2 2.1D 28 1 2008 JUN 18 1713 10.68 35 31.46 120 49.80 3.50 67 .13 .2 .7 2.2D 31 7 2008 JUN 18 1911 7.13 35 31.52 120 49.74 3.67 69 .14 .2 .7 2.0D 31 7 2008 JUN 19 0039 54.77 37 27.97 118 46.95 11.15 42 .05 .2 .6 2.3D 113 6 2008 JUN 19 0237 19.57 40 33.13 122 16.93 18.76 12 .05 .5 .8 2.1D 172 22 2008 JUN 19 0540 26.76 37 25.50 120 4.24 24.15 18 .12 1.2 1.1 2.1D 146 31 2008 JUN 19 0925 54.11 40 33.05 122 17.44 18.94 17 .08 .4 .7 2.5D 92 21 2008 JUN 19 2049 23.56 35 43.42 121 3.91 7.01 59 .09 .2 .4 2.1D 50 8 2008 JUN 19 2357 51.68 36 40.86 121 18.52 6.17 71 .07 .1 .3 3.8W 31 4 2008 JUN 20 0000 14.32 36 40.68 121 18.28 5.64 65 .05 .1 .2 2.7D 35 3 2008 JUN 20 0205 37.03 38 46.02 122 43.90 2.24 67 .08 .1 .2 3.0D 42 2 2008 JUN 20 0210 51.57 36 40.66 121 18.19 5.38 65 .06 .1 .3 2.5D 36 3 2008 JUN 21 1107 5.16 36 40.65 121 18.24 5.44 67 .05 .1 .3 2.0D 35 3 2008 JUN 21 1814 47.62 37 25.36 121 46.17 6.88 69 .11 .1 .4 2.1D 33 4 2008 JUN 22 0023 36.12 36 4.56 120 38.37 6.55 91 .11 .2 .4 3.2L 26 4 2008 JUN 22 0513 22.80 38 48.36 122 47.44 2.26 53 .07 .1 .2 2.1D 35 0 2008 JUN 23 0327 32.66 38 45.52 122 43.49 1.77 57 .08 .1 .2 2.5D 31 2 2008 JUN 23 0439 30.38 36 40.46 121 18.21 6.62 46 .04 .1 .5 2.1D 36 5 2008 JUN 23 0532 58.04 41 20.93 122 9.26 8.14 10 .05 .3 .7 2.5D 105 3 2008 JUN 23 0630 46.62 36 40.49 121 18.31 6.22 49 .06 .1 .3 2.2D 36 5 2008 JUN 23 0631 6.96 41 0.68 124 53.55 17.00 22 .16 1.831.6 2.6D 233 75 2008 JUN 23 0834 3.01 37 21.44 119 59.00 15.54 31 .26 1.7 .6 2.1D 130 24 2008 JUN 23 1400 40.81 38 20.09 122 46.06 3.64 45 .11 .2 .5 2.0D 49 4 2008 JUN 23 2051 16.91 39 1.46 123 6.69 5.13 26 .09 .2 .5 2.3D 57 5 2008 JUN 24 1057 49.60 36 30.39 120 59.40 5.66 39 .16 .3 1.1 2.6D 63 8
