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 3.1, 7 miles ENE of Laytonville, CA at 04:55 PM UTC Sunday, 02 11, 2007 (08:55 AM PST Sunday, Feb 11, 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 09:20 PM UTC Tuesday, 02 13, 2007 (01:20 PM PST Tuesday, Feb 13, 2007).
The largest event to occur this week in this region was a microearthquake of magnitude 2.1, 10 miles SW of Toms Place, CA at 07:00 AM UTC Sunday, 02 11, 2007 (11:00 PM PST Saturday, Feb 10, 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 FEB 9 1714 53.36 35 48.66 121 18.52 6.01 14 .00 .6 .7 2.0D 31 4 2007 FEB 9 2343 52.75 35 32.63 120 50.86 7.98 38 .00 .5 1.1 2.5D 49 10 2007 FEB 9 2355 31.86 36 0.08 120 33.62 3.32 50 .00 .2 .2 2.3D 47 2 2007 FEB 10 0538 55.57 35 41.94 121 1.14 7.02 58 .00 .2 .4 2.4D 50 4 2007 FEB 10 1434 22.68 38 49.63 122 47.76 3.74 23 .00 .2 .4 2.1D 58 2 2007 FEB 11 0248 49.00 38 49.66 122 47.62 0.00 40 .00 .1 .7 2.5D 35 8 2007 FEB 11 0405 1.95 39 26.62 123 6.55 0.01 30 .00 .2 1.1 2.0D 46 15 2007 FEB 11 0700 54.15 38 49.42 122 49.72 3.07 18 .00 .2 .5 2.1D 46 3 2007 FEB 11 0700 57.13 37 27.82 118 49.30 6.54 33 .00 .2 .8 2.1D 122 9 2007 FEB 11 1329 37.59 39 43.47 123 21.43 5.02 22 .00 .2 .8 2.7D 54 11 2007 FEB 11 1332 56.41 39 43.42 123 21.36 3.94 20 .00 .2 1.0 2.5D 53 11 2007 FEB 11 1509 56.08 40 38.03 123 39.97 22.91 12 .00 .4 .6 2.3D 53 17 2007 FEB 11 1655 44.33 39 43.66 123 21.41 0.10 27 .00 .2 1.9 3.1L 54 11 2007 FEB 11 1732 49.57 39 43.65 123 21.22 0.50 27 .00 .2 5.4 2.6D 53 12 2007 FEB 11 1832 25.89 35 59.99 120 33.93 4.54 70 .00 .2 .3 2.0D 44 3 2007 FEB 12 0354 28.23 35 57.15 121 36.56 4.28 66 .00 .8 4.0 2.1D 203 23 2007 FEB 12 1430 18.14 40 42.18 123 54.67 21.91 12 .00 .5 .6 2.1D 108 16 2007 FEB 12 1843 2.50 36 45.83 121 16.64 5.32 62 .00 .2 .4 2.0D 74 6 2007 FEB 12 1926 24.92 39 26.28 123 6.50 2.84 39 .00 .1 1.4 2.2D 32 15 2007 FEB 13 0813 38.58 39 43.57 123 21.33 0.67 18 .00 .3 2.1 2.3D 65 14 2007 FEB 13 0919 50.46 36 13.10 120 47.70 5.41 42 .00 .3 .4 2.2D 93 1 2007 FEB 13 0933 34.26 38 47.66 122 45.02 4.42 17 .00 .2 .4 2.0D 51 4 2007 FEB 13 2003 45.61 40 33.08 123 32.48 10.54 15 .00 .6 .6 2.3D 63 3 2007 FEB 13 2120 48.75 37 19.38 122 6.43 0.09 12 .00 .2 .6 2.2D 81 2 2007 FEB 14 0902 24.80 38 50.55 122 50.28 1.85 21 .00 .2 .7 2.4D 52 5 2007 FEB 14 0924 23.67 36 32.15 121 7.22 3.03 29 .00 .2 .5 2.4D 59 5 2007 FEB 14 1445 7.73 36 1.69 121 34.03 2.52 40 .00 .7 2.0 2.8D 179 23 2007 FEB 14 2137 44.53 36 31.07 121 6.22 10.20 37 .00 .2 .4 2.3D 52 3
