Northern California Seismicity Report for the week ending
Feb 01, 2007

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, 25 miles NNE of Covelo, CA at 12:14 PM UTC Wednesday, 01 31, 2007 (04:14 AM PST Wednesday, Jan 31, 2007).
The largest event to occur this week in this region was a microearthquake of magnitude 2.2, 4 miles W of Cupertino, CA at 08:40 PM UTC Thursday, 01 25, 2007 (12:40 PM PST Thursday, Jan 25, 2007).
The largest event to occur this week in this region was a microearthquake of magnitude 1.8, 10 miles WSW of Toms Place, CA at 11:19 AM UTC Monday, 01 29, 2007 (03:19 AM PST Monday, Jan 29, 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 JAN 25 1112  6.71 39 43.60 123 21.26  2.54 24 .00  .2 1.3        2.0D  48 11   
2007 JAN 25 1515 31.68 38 49.73 122 52.07  3.01 45 .00  .1  .7        2.7D  29  5   
2007 JAN 25 1612 58.99 38 49.69 122 51.97  3.69 37 .00  .1  .5        2.6D  34  7   
2007 JAN 25 2040 43.74 37 19.32 122  6.17  0.01 31 .00  .131.6        2.2D  46  2   
2007 JAN 25 2112  9.59 41 32.13 121 53.64  0.04 14 .00  .5 1.6        2.3D  78  9   
 
2007 JAN 26 0236  7.04 37 17.69 121 40.54  2.75 85 .00  .1  .4        2.1D  56  4   
2007 JAN 26 0536  5.30 38 49.10 122 48.65  4.74 37 .00  .1  .3        2.1D  36  2   
2007 JAN 26 1726  7.90 38 49.99 122 48.88  4.91  8 .00  .731.6        2.1D 118  3   
2007 JAN 26 1941  6.72 36  1.58 120  8.00 13.03 30 .00  .6  .8        2.1D 109  4   
2007 JAN 26 2006 19.86 36 53.55 121 37.24  0.01 24 .00  .431.6        2.1D  47  3   
 
2007 JAN 27 1316 27.32 37 16.43 119 23.00 38.94  8 .00  .6 2.0        2.0D  96 21   
2007 JAN 28 1100 17.99 39 22.55 123 15.94  2.33 34 .00  .231.6        2.2D  45 19   
2007 JAN 28 1132 53.75 38 47.80 122 44.08  2.78 38 .00  .1  .3        2.1D  47  3   
2007 JAN 29 1230 15.31 38 46.12 122 43.98  2.43 35 .00  .1  .3        2.2D  29  1   
2007 JAN 29 1323 12.99 37  7.10 121 31.35  6.92 87 .00  .1  .3        2.1D  74  1   
 
2007 JAN 29 2119 31.94 36 32.30 121  7.88  8.63 50 .00  .1  .3        2.1D  42  6   
2007 JAN 30 1655 51.61 40 18.52 124 33.30 18.83 14 .00 1.1  .3        2.9D 234 22   
2007 JAN 31 1214 52.27 40  7.26 123  2.72 42.19 53 .00  .3  .9        3.2L  28 23   
2007 JAN 31 1302 12.69 37 37.80 121 52.10  7.19 65 .00  .1  .2        2.0D  31  4