Northern California Seismicity Report for the week ending Jul 05, 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

• 43 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 4.1, 7 miles S of Tres Pinos, CA at 05:33 PM UTC Monday, 07 02, 2001 (10:33 AM PDT Monday, Jul 02, 2001).

This event has been followed by five aftershocks of magnitude greater than 3. This event and the 4.0 aftershock at 12:02 AM PDT Tuesday, Jul 03, 2001 are not atypical for this region. Since 1969 there have been eight events larger than magnitude 5 and 93 events larger than magnitude 4 located within 50 km of these most recent events.

• 7 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 1.9, 5 miles S of Gilroy, CA at 12:51 AM UTC Friday, 06 29, 2001 (05:51 PM PDT Thursday, Jun 28, 2001).

• 24 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 2.8, 10 miles SW of Toms Place, CA at 02:52 AM UTC Friday, 06 29, 2001 (07:52 PM PDT Thursday, Jun 28, 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 JUN 28 0930 49.69 37 29.67 118 50.43  3.71 26 .07  .3 1.3 MOR    2.3D 123  7 WW
2001 JUN 28 1423  3.72 38 46.22 122 43.27  2.49 15 .06  .2  .4 GEY    2.0D  88  0 WW
2001 JUN 28 2027 42.02 38 49.35 122 47.57  4.07 13 .03  .2  .6 GEY    2.1D  55  2 WW
2001 JUN 28 2318 16.60 37 28.51 118 50.27  4.91 34 .06  .3  .7 MOR    2.2D 129  8 NN
2001 JUN 29 0223  6.84 37 28.52 118 50.36  4.99 34 .05  .2  .6 MOR    2.2D 130  9 NN
 
2001 JUN 29 0252 39.09 37 28.51 118 50.22  4.70 35 .07  .3 1.0 MOR    2.8D 129  8 WW
2001 JUN 29 0608  7.44 37 28.21 118 49.98  3.21 25 .07  .3 1.8 MOR    2.2D 131 13 WW
2001 JUN 29 0952 54.87 37 28.65 118 50.23  4.74 25 .06  .3  .9 MOR    2.0D 128  8 WW
2001 JUN 29 1715 21.05 36 38.49 121 15.20  4.39 43 .05  .2  .4 STN    2.1D  66  3 WW
2001 JUN 30 0713 22.78 39 39.09 122 35.69 13.26 11 .16  .6 1.4 SAC    2.4D  79 10 WW
 
2001 JUN 30 0752 57.95 38 46.27 122 44.53  3.35 16 .06  .2  .6 GEY    2.0D  75  2 WW
2001 JUN 30 1651 12.54 36 43.42 120 46.07  0.03 31 .21  .7 2.6 ORT  # 2.4D 160  7 WW
2001 JUL  1 0338 35.94 38 48.63 122 46.33  2.45 16 .04  .2  .5 GEY    2.3D  45  2 WW
2001 JUL  1 1541 57.15 39 15.46 123 14.10  0.77 25 .05  .1  .8 MAA    2.2D  40  8 NN
2001 JUL  2 1521 23.22 36 41.92 121 19.82  4.01 58 .07  .1  .3 STN    3.2D  48  2 WW
 
2001 JUL  2 1532 21.38 36 41.67 121 19.42  3.92 57 .06  .1  .3 STN    2.8D  45  2 WW
2001 JUL  2 1732 32.53 36 41.81 121 19.68  4.61 61 .07  .1  .3 STN    3.4L  47  2 WW
2001 JUL  2 1733 53.73 36 41.65 121 19.88  6.13 25 .06  .2  .6 STN    4.1L  95  6 WW
2001 JUL  2 1744 47.88 36 41.62 121 19.35  4.40 46 .06  .2  .4 STN    2.3D  45  3 WW
2001 JUL  2 2247 38.05 36 41.79 121 19.79  5.40 62 .06  .1  .3 STN    3.0D  47  2 WW
 
2001 JUL  3 0330  2.92 38 48.30 122 46.61  0.45 29 .07  .2  .4 GEY    3.1L  42  2 WW
2001 JUL  3 0628 39.76 36 41.90 121 19.96  4.88 42 .05  .2  .4 STN    2.1D  48  2 WW
2001 JUL  3 1346 22.35 37 31.21 118 48.26 13.35 30 .05  .3  .6 MOR    2.2D 114  3 WW
2001 JUL  3 1729 43.52 36 41.66 121 19.60  5.24 62 .06  .1  .3 STN    2.8D  45  2 WW
2001 JUL  3 1902 50.79 36 41.72 121 19.69  5.94 65 .07  .1  .3 STN    4.0L  45  2 WW
 
2001 JUL  3 1907 16.20 36 41.09 121 19.20  5.65 47 .19  .5  .8 STN    3.9L 145  3 WW
2001 JUL  3 1909  4.17 36 41.88 121 20.04  4.59 19 .06  .3 1.7 STN    2.8D  94 17 WW
2001 JUL  3 1931 58.03 36 41.73 121 19.50  4.04 60 .07  .1  .3 STN    3.0L  46  2 WW
2001 JUL  3 2157 18.79 36 41.69 121 19.48  4.40 62 .06  .1  .3 STN    3.8L  46  2 WW
2001 JUL  3 2213 26.80 36 41.12 121 18.63  4.15 62 .07  .1  .3 STN    3.0L  36  4 WW
 
2001 JUL  3 2223 39.27 36 42.19 121 20.24  4.47 47 .06  .1  .3 STN    2.3D  51  1 WW
2001 JUL  3 2233 41.07 36 40.98 121 18.75  6.09 45 .05  .2  .4 STN    2.3D  35  4 WW
2001 JUL  4 0024 25.18 36 41.22 121 18.86  4.84 50 .05  .1  .3 STN    2.7D  38  4 WW
2001 JUL  4 0223 40.35 36 41.36 121 19.11  4.45 36 .05  .2  .4 STN    2.0D  40  3 WW
2001 JUL  4 0642 16.11 36 41.70 121 19.57  4.87 56 .05  .1  .3 STN    2.5D  45  2 WW
 
2001 JUL  4 0653 50.25 36 41.20 121 18.95  5.63 57 .05  .1  .3 STN    2.5D  38  4 WW
2001 JUL  4 0655 28.40 36 41.28 121 19.10  5.98 64 .07  .1  .4 STN    3.0L  39  3 WW
2001 JUL  4 0758 55.42 36 41.61 121 19.47  4.74 48 .05  .1  .3 STN    2.2D  44  2 WW
2001 JUL  4 1039 13.42 36 41.37 121 19.00  4.40 45 .06  .1  .4 STN    2.2D  40  3 WW
2001 JUL  4 1054 27.52 36 41.54 121 19.35  4.79 48 .06  .1  .4 STN    2.3D  43  3 WW
 
2001 JUL  4 1533 39.34 39 14.31 123  7.34  7.38 15 .03  .2 1.0 MAA    2.0D  87 13 WW
2001 JUL  4 1549 57.90 36 42.11 121 20.15  4.66 57 .06  .1  .3 STN    3.0D  51  1 WW
2001 JUL  4 2320 23.52 39 45.63 122 50.61 11.96 11 .12  .4  .8 SAC    2.0D 101 16 WW