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 moderate earthquake of magnitude 5.4, 7 miles E of Milpitas, CA at 03:04 AM UTC Wednesday, 10 31, 2007 (07:04 PM PST Tuesday, Oct 30, 2007).
The largest event to occur this week in this region was a moderate earthquake of magnitude 5.4, 7 miles E of Milpitas, CA at 03:04 AM UTC Wednesday, 10 31, 2007 (07:04 PM PST Tuesday, Oct 30, 2007).
The largest event to occur this week in this region was a microearthquake of magnitude 2.2, 7 miles WSW of Toms Place, CA at 09:42 PM UTC Tuesday, 10 30, 2007 (01:42 PM PST Tuesday, Oct 30, 2007).
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 2007 OCT 25 0256 53.75 40 59.42 121 57.31 15.95 29 .08 .2 1.1 2.5D 46 23 2007 OCT 25 1405 18.00 40 59.25 121 57.19 16.55 18 .07 .3 1.3 2.1D 47 23 2007 OCT 26 1225 16.75 38 47.59 122 46.46 0.53 57 .06 .1 .2 2.9L 22 1 2007 OCT 26 1225 54.31 38 47.65 122 46.41 0.32 33 .06 .1 .2 2.6D 44 1 2007 OCT 26 1836 3.05 38 46.92 122 54.79 4.60 74 .08 .1 .3 2.7D 35 4 2007 OCT 26 2008 21.39 38 47.06 122 54.81 4.30 76 .09 .1 .4 2.6D 34 4 2007 OCT 26 2144 32.56 37 6.64 121 49.25 4.67 89 .10 .1 .2 2.8D 28 1 2007 OCT 26 2352 56.31 37 6.62 121 49.32 4.55 47 .08 .2 .3 2.0D 31 1 2007 OCT 27 0816 8.21 36 34.18 121 5.86 8.69 67 .08 .1 .3 2.2D 34 5 2007 OCT 27 1457 40.22 37 32.17 121 55.19 9.83116 .13 .1 .3 2.4D 24 3 2007 OCT 27 2122 46.17 38 47.50 122 45.39 2.04 58 .06 .1 .2 2.4D 42 1 2007 OCT 28 1112 1.98 36 42.78 121 20.93 1.15 35 .06 .2 .2 2.3D 67 1 2007 OCT 28 2341 24.65 37 24.69 118 36.09 11.36 37 .07 .2 .6 2.2D 68 5 2007 OCT 30 1944 40.22 38 45.42 122 42.43 2.31 55 .11 .1 .3 2.5D 34 2 2007 OCT 30 1955 35.23 37 58.62 122 2.82 15.37101 .16 .2 .3 2.9L 52 6 2007 OCT 30 2142 30.31 37 32.30 118 48.77 6.47 40 .04 .2 .5 2.2D 93 6 2007 OCT 30 2352 52.25 37 49.78 121 57.99 6.07 22 .09 .2 .5 2.2D 66 4 2007 OCT 31 0136 51.41 37 52.43 121 59.25 11.72 76 .11 .1 .2 2.3D 43 2 2007 OCT 31 0304 54.81 37 26.02 121 46.46 10.04157 .12 .1 .3 5.4W 50 3 2007 OCT 31 0341 31.05 37 23.82 121 44.81 8.67 54 .05 .1 .3 2.1D 35 3 2007 OCT 31 0602 16.86 37 25.63 121 46.37 9.35 54 .06 .1 .3 2.0D 50 4 2007 OCT 31 0805 51.23 37 25.44 121 46.23 4.76 62 .06 .1 .3 2.2D 46 4 2007 OCT 31 0957 51.02 37 22.10 121 43.61 8.78119 .09 .1 .2 2.8D 35 4 2007 OCT 31 1246 30.69 38 49.12 122 47.43 2.52 37 .07 .2 .2 2.5D 39 1 2007 OCT 31 1414 50.69 37 21.96 121 43.67 7.93 85 .06 .1 .2 2.3D 35 4 2007 OCT 31 1941 24.80 37 25.90 121 46.66 8.46 63 .06 .1 .3 2.2D 50 3 2007 OCT 31 1943 26.85 38 48.88 122 47.17 1.86 29 .06 .2 .3 2.2D 73 0 2007 OCT 31 2254 24.54 37 26.02 121 46.80 7.58101 .10 .1 .8 3.7L 51 12
