Northern California Seismicity Report for the week ending Feb 15, 2001

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

The report no longer includes maps showing earthquakes for the entire US or world. Those maps are now available from the U.S.G.S. National Earthquake Information Center. 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 contained on the real-time earthquake web page. 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

• 20 M >2.0 earthquakes in Northern and Central California (map) (within dashed polygon of figure).

The largest event to occur this week in this region was a light earthquake of magnitude 4.0, 4 miles SSE of San Juan Bautista, CA at 11:04 PM UTC Sunday, 02 11, 2001 (03:04 PM PST Sunday, Feb 11, 2001).

This earthquake occurred on the San Andreas fault south of the 1989 Loma Prieta earthquake rupture zone. It is on a section of the fault that commonly produces light earthquakes. On 8/12/1998 this same section of the fault was the site of a M5.4 earthquake. This earthquake was felt throughout the area, including the San Francisco Peninsula and the Monterey area.

• 24 M >1.2 earthquakes in the San Francisco Bay area (map).

The largest event to occur this week in this region was a light earthquake of magnitude 4.0, 4 miles SSE of San Juan Bautista, CA at 11:04 PM UTC Sunday, 02 11, 2001 (03:04 PM PST Sunday, Feb 11, 2001).

See above comments

• 15 M >1.2 earthquakes in the Long Valley region (map).

The largest event to occur this week in this region was a microearthquake of magnitude 2.3, 8 miles WSW of Toms Place, CA at 11:55 AM UTC Thursday, 02 08, 2001 (03:55 AM PST Thursday, Feb 08, 2001).

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

2001 FEB  8 0443 49.16 37 51.02 119 51.23 35.11 18 .04  .7  .4 YOS    2.3D 143 15 NN
2001 FEB  8 1155 16.53 37 31.72 118 49.04  5.84 29 .06  .3  .6 MOR    2.3D 113  7 WW
2001 FEB  8 1401 34.64 36 51.85 121 35.86  7.58 49 .09  .2  .3 SJB    2.1D  50  2 WW
2001 FEB  8 2101 46.05 39 44.99 122 51.21  0.35 34 .28  .3 1.7 SAC  # 2.2D  72 16 NN
2001 FEB  8 2147 34.90 39 19.14 123 13.09  7.41 34 .03  .1  .7 MAA    2.5D  39 14 NN
 
2001 FEB  9 0357 47.31 39 44.97 122 51.11  0.55 56 .44  .3 2.7 SAC    2.9D  40 16 NN
2001 FEB  9 2016 56.21 37 21.37 121 43.17  8.26 66 .04  .1  .2 ALU    2.2D  37  3 NN
2001 FEB  9 2113 31.00 38 46.69 122 42.47  2.32 16 .07  .2  .4 GEY    2.0D  54  1 WW
2001 FEB 10 1751 28.37 37 37.62 118 54.90  4.88 23 .08  .3  .4 SMO    2.1D  50  1 NN
2001 FEB 10 1933 30.31 37 20.09 118 32.31 13.63 33 .05  .3  .5 KAI    2.3D 145  3 NN
 
2001 FEB 11 1814 19.87 39  0.61 123 21.56  5.64 25 .06  .2  .8 PAR    2.1D  68 16 NN
2001 FEB 11 1852 54.24 36 52.87 121 36.63  5.78 56 .09  .1  .2 SJB    2.3D  50  2 NN
2001 FEB 11 2304  6.55 36 47.65 121 30.75  6.70 65 .14  .2  .3 SJB    4.0L  35  3 NN
2001 FEB 12 0149 19.78 36 47.95 121 30.71  5.68 54 .09  .1  .3 SJB    2.2D  34  2 NN
2001 FEB 12 0257 30.36 36 47.68 121 30.64  7.01 54 .10  .2  .4 SJB    2.3D  35  3 WW
 
2001 FEB 12 0814 41.48 36 35.24 121 19.06  9.42 65 .07  .1  .3 STN    3.0D  31  3 NN
2001 FEB 13 1857 11.74 37 28.15 118 36.23 12.50 28 .04  .3  .6 RVL    2.0D  62  4 WW
2001 FEB 13 2058 41.99 37  7.86 121 31.72  8.02 55 .06  .2  .4 CYN    2.1D  73  2 WW
2001 FEB 13 2129 33.29 35 51.53 120 24.15  5.91 31 .05  .2  .2 GOL    2.5D 117  3 WW
2001 FEB 14 2324 14.51 40 39.31 122 26.43 23.97 12 .14  .6 1.1 SHA    2.3D  76  7 WW