Northern California Seismicity Report for the week ending Oct 21, 1999

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@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

The largest event to occur this week in this region was a minor earthquake of magnitude 3.4 8 miles WSW of Lakeport, CA at 12:17 AM UTC Saturday, Oct 16, 1999 (05:17 PM PDT Friday, Oct 15, 1999).
The largest event to occur this week in this region was a microearthquake of magnitude 2.8 3 miles WNW of San Juan Bautista, CA at 04:15 AM UTC Friday, Oct 15, 1999 (09:15 PM PDT Thursday, Oct 14, 1999).
The largest event to occur this week in this region was a microearthquake of magnitude 2.8 3 miles E of Mammoth Lakes, CA at 08:15 AM UTC Tuesday, Oct 19, 1999 (01:15 AM PDT Tuesday, Oct 19, 1999).

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 N RMS ERH ERZ LOC   PREF
YR MON DA HRMN  SEC  DEG MIN  DEG  MIN    KM  RD S SEC  KM  KM REMKS MAG 

99 OCT 14 2325 23.58 40 18.37 124 30.93 21.65 24 1 .08  .9  .3 MEN # 2.3D
99 OCT 15  415 40.33 36 51.83 121 35.72  6.60 65 3 .10  .1  .3 SJB   2.8D
99 OCT 15 1500 16.73 36 37.30 121 13.65  5.62 57 1 .06  .1  .3 STN   3.1L
99 OCT 15 1500 57.03 36 37.42 121 13.65  5.33 52 1 .04  .1  .5 STN   2.0D
99 OCT 16   17 38.70 39  1.18 123  4.02  1.89 34   .08  .2 1.0 MAA   3.4L

99 OCT 16   20 55.79 39  1.49 123  4.26  2.51 30 2 .04  .1 1.1 MAA   2.1D
99 OCT 16 1037 36.27 37 38.96 119  1.39  3.22  8   .04  .9  .7 MAM   2.2D
99 OCT 16 2134 12.96 38 50.74 123 40.29  6.03 29   .10  .5  .7 PAR   2.7D
99 OCT 16 2245 22.68 36  7.72 120 11.23  8.50 33   .05  .2  .5 COA   2.2D
99 OCT 17  211 18.05 37 33.50 118 47.58  7.65 35   .06  .2  .5 MOR   2.4D

99 OCT 17 1144 30.72 40 15.09 124 18.26 26.14 26   .10  .6  .6 MEN   2.9D
99 OCT 17 1555  8.58 39  1.36 123  4.25  1.70 30   .08  .1  .8 MAA   2.3D
99 OCT 17 1603 20.42 38 46.48 122 44.73  3.28 32   .07  .1  .4 GEY   2.2D
99 OCT 18  436 27.05 36  0.04 120 33.58  4.58 41 2 .05  .2  .2 SLA   2.1D
99 OCT 18  814 20.18 38 47.53 122 44.77  3.40 39   .05  .1  .3 GEY   2.5D

99 OCT 19  548 59.01 37 37.95 119  3.22  4.00 24   .08  .4  .5 MAM   2.2D
99 OCT 19  815 44.31 37 38.92 118 55.29  7.35 36 2 .07  .3  .3 SMO   2.8D
99 OCT 19 1400 46.56 40 18.18 124 29.62  8.08 15   .06  .9  .4 MEN   2.7D
99 OCT 19 2329 13.79 36 14.33 120 21.19  7.99 23   .25 1.5  .7 COA   2.1D
99 OCT 20 1545 43.67 36 36.00 121 12.43  9.12 57   .08  .2  .3 PIN   3.2L

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