Northern California Seismicity Report for the week ending Dec 07, 2000

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

• 26 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 minor earthquake of magnitude 3.9, 3 miles WSW of Tres Pinos, CA at 10:54 PM UTC Tuesday, 12 05, 2000 (02:54 PM PST Tuesday, Dec 05, 2000).

This earthquake occurred on the San Andreas fault. The fault plane solution exhibits right-lateral strike-slip motion on a vertical fault, as is typical of other earthquakes observed in this locale. The earthquake was felt as far away as Santa Cruz, Monterey, and King City, and the maximum intensity was estimated to be IV. The peak recorded acceleration was 2% at Hollister City Hall.

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

The largest event to occur this week in this region was a minor earthquake of magnitude 3.9, 3 miles WSW of Tres Pinos, CA at 10:54 PM UTC Tuesday, 12 05, 2000 (02:54 PM PST Tuesday, Dec 05, 2000).

See above comment.

• 12 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 2.2, 9 miles WSW of Toms Place, CA at 03:36 AM UTC Thursday, 11 30, 2000 (07:36 PM PST Wednesday, Nov 29, 2000).

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

2000 NOV 30 0158 15.34 35 55.71 120 28.50  5.31 34 .06  .2  .2 MID    2.2D  70  2 NN
2000 NOV 30 0336  2.55 37 30.86 118 49.71  2.31 24 .07  .3 2.8 MOR    2.2D 136  8 NN
2000 NOV 30 1408  4.11 35 54.32 120 26.88  6.31 38 .05  .1  .2 GOL    2.9D  49  4 NN
2000 NOV 30 1853 53.84 40 37.75 122 24.30 24.00 15 .07  .4  .5 SHA    2.4D  74 11 NN
2000 NOV 30 2210 36.96 40 38.22 122 24.72 21.16  9 .05  .6  .9 SHA    2.1D  83 23 NN
 
2000 DEC  1 1216 44.58 38 47.62 122 48.65  4.65 32 .05  .1  .3 GEY    2.1D  38  2 NN
2000 DEC  1 1804 33.68 37 37.24 122 22.19 11.41 57 .06  .2  .3 SFP    2.2D  58  5 NN
2000 DEC  1 2032 46.98 38 46.38 122 44.62  3.29 37 .06  .1  .4 GEY    2.1D  32  2 NN
2000 DEC  1 2257 54.08 37 38.68 119 21.98 19.88 46 .09  .2  .8 KAI    3.0D  53 25 NN
2000 DEC  2 1100 21.06 37 26.37 121 48.27  4.53 74 .06  .1  .2 ALU    2.5D  53  1 NN
 
2000 DEC  2 1355 48.50 35 46.92 121 16.22  3.17 31 .03  .5 1.0 SSM    2.1D 172 15 NN
2000 DEC  2 1732 38.64 38 49.28 122 49.37  0.62 11 .03  .2  .7 GEY    2.1D  52  3 WW
2000 DEC  3 1207 57.80 40 37.87 122 24.41 23.40 18 .10  .3  .5 SHA    3.1D  76 10 NN
2000 DEC  3 1214 29.52 40 38.28 122 24.10 23.93 11 .05  .4  .4 SHA    2.4D  79 11 NN
2000 DEC  3 1342  3.05 35 51.29 120 23.83  5.03 39 .06  .1  .2 GOL    2.3D  70  2 NN
 
2000 DEC  4 1227 34.31 38 47.53 122 44.57  1.74 31 .07  .1  .3 GEY    2.2D  44  3 NN
2000 DEC  4 1257 29.96 36 40.41 121 17.65  3.85 63 .07  .1  .3 STN    2.9D  40  2 NN
2000 DEC  4 2048 11.40 37 26.56 118 51.19  6.87  8 .03  .6 1.9 MOR     .6X 190 13 NN
2000 DEC  5 0126  6.81 41  1.78 123 42.85 22.19  9 .06  .4  .7 EUR    2.0D 113 17 NN
2000 DEC  5 0857 52.95 40 27.63 123 34.86 25.35 12 .05  .5  .9 EUR    2.2D  80 10 WW
 
2000 DEC  5 1654 42.46 38 47.95 122 45.11  2.21 36 .07  .1  .4 GEY    2.3D  48  4 NN
2000 DEC  5 1731 56.21 37  6.14 121 49.06  5.63 46 .07  .1  .2 LOM    2.0D  56  2 NN
2000 DEC  5 2254 54.50 36 46.65 121 22.72  8.95 71 .08  .2  .3 HOL    3.9D  37  3 WW
2000 DEC  6 0947 36.34 39 38.27 122  0.09 21.04 14 .10  .4  .7 SAC    2.4D 140 33 WW
2000 DEC  6 1250  1.68 38 34.38 122 15.55  8.76 39 .21  .3  .7 GVL    2.4D  62  1 WW
 
2000 DEC  6 2004 12.95 38 49.89 122 45.90  1.03 19 .06  .2  .5 GEY    2.2D  53  4 WW