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 3.0, 8 miles E of Ukiah, CA at 06:19 PM UTC Friday, 07 18, 2008 (11:19 AM PDT Friday, Jul 18, 2008).
The largest event to occur this week in this region was a microearthquake of magnitude 2.7, 7 miles E of Milpitas, CA at 02:22 AM UTC Saturday, 07 19, 2008 (07:22 PM PDT Friday, Jul 18, 2008).
The largest event to occur this week in this region was an earthquake of magnitude 1.6, 3 miles WSW of Mammoth Lakes, CA at 12:58 AM UTC Sunday, 07 20, 2008 (05:58 PM PDT Saturday, Jul 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 JUL 16 0044 17.56 36 18.45 119 43.57 6.33 12 .10 .5 1.3 2.0D 76 69 2008 JUL 16 0514 58.74 38 3.36 122 0.38 19.48 33 .11 .3 .2 2.1D 129 3 2008 JUL 16 0523 51.48 38 3.08 121 59.97 19.34 40 .15 .4 .3 2.1D 129 3 2008 JUL 16 2131 39.65 35 30.59 120 48.57 3.95 67 .14 .2 .7 2.1D 43 9 2008 JUL 17 0559 58.97 35 30.35 120 48.45 5.20 65 .12 .2 .6 2.3D 41 9 2008 JUL 18 0640 16.67 38 48.89 122 48.15 2.99 34 .07 .2 .3 2.2D 31 1 2008 JUL 18 0854 21.81 40 24.36 122 5.41 25.05 24 .12 .3 .6 2.5D 31 22 2008 JUL 18 1819 41.60 39 8.69 123 3.69 7.69 32 .09 .2 .4 3.0D 35 2 2008 JUL 18 1829 43.49 35 16.12 120 53.07 3.90 62 .10 .2 .2 2.3D 135 1 2008 JUL 19 0157 28.78 38 48.81 122 47.77 3.70 45 .08 .2 .3 2.2D 47 1 2008 JUL 19 0200 33.32 37 25.78 121 46.45 8.97 88 .07 .1 .3 2.5D 18 3 2008 JUL 19 0222 1.25 37 25.84 121 46.27 11.28115 .10 .1 .3 2.7D 35 3 2008 JUL 19 0510 29.32 37 19.99 118 44.23 18.23 41 .07 .3 .6 2.7D 76 6 2008 JUL 19 1044 9.85 38 24.78 122 39.82 9.99 75 .09 .1 .2 2.5D 41 3 2008 JUL 20 0701 47.14 36 34.47 121 6.90 9.70 34 .06 .2 .4 2.0D 54 7 2008 JUL 20 0716 30.36 40 24.45 124 18.69 29.05 14 .05 .6 .9 2.8L 165 8 2008 JUL 21 0018 16.52 39 48.66 123 10.71 9.38 22 .06 .2 .4 2.2D 42 9 2008 JUL 21 0116 44.01 39 48.73 123 10.61 9.75 27 .10 .2 .4 2.4D 31 9 2008 JUL 21 0949 39.72 37 27.33 121 48.52 7.07111 .10 .1 .3 2.4D 37 1 2008 JUL 22 0837 9.82 36 36.07 121 12.30 7.12 70 .06 .1 .3 2.8D 38 3 2008 JUL 22 0841 39.99 36 36.19 121 12.46 7.15 65 .06 .1 .3 2.6D 38 4 2008 JUL 22 0924 56.63 36 35.99 121 12.27 7.05 59 .05 .1 .3 2.5D 38 3 2008 JUL 22 1326 41.47 38 52.24 122 28.90 7.15 55 .12 .2 .3 2.1D 57 3 2008 JUL 22 1746 54.47 39 34.78 122 1.42 20.64 15 .06 .3 4.1 2.0D 83 36 2008 JUL 22 1820 36.35 41 10.50 123 29.04 35.37 8 .03 .4 .6 2.4D 65 12 2008 JUL 22 1854 23.14 41 10.04 123 28.78 36.78 19 .16 .4 .9 2.5D 49 13 2008 JUL 22 1858 51.71 41 11.64 123 27.67 35.36 13 .21 1.0 1.4 2.7D 82 9
