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 3.2, 5 miles SSE of Parkfield, CA at 07:55 AM UTC Thursday, 05 15, 2008 (12:55 AM PDT Thursday, May 15, 2008).
The largest event to occur this week in this region was a microearthquake of magnitude 3.0, 2 miles W of San Juan Bautista, CA at 05:10 PM UTC Saturday, 05 17, 2008 (10:10 AM PDT Saturday, May 17, 2008).
The largest event to occur this week in this region was a microearthquake of magnitude 2.9, 9 miles SW of Toms Place, CA at 07:58 PM UTC Tuesday, 05 20, 2008 (12:58 PM PDT Tuesday, May 20, 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 MAY 14 0356 58.06 38 49.44 122 45.79 1.26 60 .08 .1 .2 2.7D 49 1 2008 MAY 14 2306 50.41 40 52.61 123 43.10 28.23 14 .06 .4 .6 2.8D 61 1 2008 MAY 15 0647 4.58 37 22.68 121 43.70 10.67144 .12 .1 .3 2.8D 34 4 2008 MAY 15 0702 54.46 37 32.66 118 52.27 8.35 47 .05 .2 .4 2.7D 63 6 2008 MAY 15 0755 18.49 35 50.28 120 23.37 9.24 87 .09 .1 .2 3.2L 33 1 2008 MAY 15 2348 16.65 36 51.08 121 18.79 7.56 66 .07 .1 .4 2.0D 67 8 2008 MAY 16 0654 4.62 38 49.54 122 51.95 2.32 52 .07 .1 .2 2.0D 53 1 2008 MAY 16 1939 20.76 37 24.46 121 45.13 7.13 84 .11 .1 .4 2.0D 28 4 2008 MAY 17 1710 18.57 36 50.67 121 34.72 6.32 84 .13 .2 .4 3.0L 41 2 2008 MAY 17 2105 56.89 36 50.76 121 34.72 5.96 77 .11 .1 .3 2.8D 41 2 2008 MAY 17 2141 47.01 39 53.23 123 12.34 8.99 20 .08 .3 .4 2.2D 60 1 2008 MAY 18 0523 43.26 41 1.69 123 23.12 29.26 18 .12 .4 1.6 2.3D 63 28 2008 MAY 18 1623 13.97 37 24.17 121 44.90 9.29 97 .08 .1 .3 2.2D 27 4 2008 MAY 18 1706 59.66 38 46.08 122 26.07 4.14 59 .17 .2 1.1 2.3D 49 12 2008 MAY 18 1707 32.09 38 45.59 122 25.68 8.90 41 .13 .2 .9 2.2D 55 13 2008 MAY 19 0431 21.56 36 51.06 121 18.85 7.35 74 .08 .1 .3 2.5D 37 4 2008 MAY 20 1015 0.16 39 47.24 123 10.29 7.62 19 .13 .3 1.0 2.1D 52 12 2008 MAY 20 1150 0.02 36 38.80 121 13.91 7.81 45 .06 .2 .4 2.1D 41 5 2008 MAY 20 1625 36.40 37 45.76 121 58.47 10.68 92 .13 .2 .3 2.3D 46 8 2008 MAY 20 1643 54.22 37 45.77 121 58.54 10.55 94 .14 .2 .3 2.3D 46 8 2008 MAY 20 1839 58.74 36 34.90 121 4.71 9.15 73 .12 .1 .3 2.7D 33 4 2008 MAY 20 1958 54.97 37 28.25 118 48.34 8.71 45 .05 .2 .6 2.9D 71 8 2008 MAY 20 2128 59.59 36 59.66 121 39.42 4.56 59 .09 .1 .3 2.3D 36 6 2008 MAY 20 2300 14.10 36 35.72 121 12.23 9.11 68 .07 .1 .3 3.0L 32 8
