Northern California Seismicity Report for the week ending Nov 29, 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

• 15 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 3.2, 10 miles NW of Alder Springs, CA at 02:20 AM UTC Tuesday, 11 27, 2001 (06:20 PM PST Monday, Nov 26, 2001).

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

The largest event to occur this week in this region was a microearthquake of magnitude 2.4, 6 miles SSE of Brentwood, CA at 05:01 AM UTC Saturday, 11 24, 2001 (09:01 PM PST Friday, Nov 23, 2001).

• 16 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 1.8, 7 miles WNW of Toms Place, CA at 07:48 PM UTC Friday, 11 23, 2001 (11:48 AM PST Friday, Nov 23, 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 NOV 23 0215 43.84 38 49.54 122 47.71  4.85 35 .06  .1  .3 GEY    2.6D  37  2 NN
2001 NOV 23 1701 56.96 40 20.97 123 23.10 29.25 20 .08  .4  .6 MEN    2.2D  49  2 NN
2001 NOV 23 1956 54.06 39 37.39 122 31.53 20.68 30 .35  .8  .5 SAC    2.8D  42 12 NN
2001 NOV 23 2106 23.40 37 42.13 122  4.49 10.22 58 .08  .1  .2 HAY    2.1D  63  4 NN
2001 NOV 23 2357 48.79 40 46.62 123 15.05 28.21 12 .21 1.5 1.9 KLA    2.3D 113 13 WW
 
2001 NOV 24 0501  7.25 37 50.80 121 38.64  0.16 22 .27  .9 4.9 JQN  # 2.4D 169 15 WW
2001 NOV 25 1406 17.94 38 49.22 122 47.83  4.49 16 .02  .2  .5 GEY    2.2D 102  1 WW
2001 NOV 26 1952 58.21 35 55.40 120 28.12  5.33 42 .06  .2  .2 MID  # 2.8D  42  2 NN
2001 NOV 27 0220 20.99 39 45.18 122 52.04 16.57 48 .24  .3  .5 SAC    3.2D  51 32 NN
2001 NOV 27 0253  6.70 39 44.35 122 49.64  3.16 27 .10  .2 5.1 SAC    2.4D 100 24 NN
 
2001 NOV 27 1127 20.43 38 49.87 122 47.03  1.29 17 .03  .2  .6 GEY    2.2D  40  3 WW
2001 NOV 28 0115 24.97 40 42.55 123 53.81 22.29 11 .12  .8 2.0 EUR    2.6D 175 38 WW
2001 NOV 28 1026 34.15 39 16.19 123 17.85  3.71 17 .10  .3 1.7 MAA    2.2D 132  7 WW
2001 NOV 28 1205 45.67 40 47.88 123 24.36 23.18  8 .14  .9 1.6 KLA    2.8D 112 22 WW
2001 NOV 28 1319 16.29 40 50.58 123 16.94 12.50 10 .20 1.7 1.5 KLA    2.4D 175 21 WW