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 3.1, 2 miles ESE of The Geysers, CA at 04:34 PM UTC Monday, 07 24, 2000 (09:34 AM PDT Monday, Jul 24, 2000).
The largest event to occur this week in this region was a microearthquake of magnitude 2.7, 2 miles SSW of San Juan Bautista, CA at 06:30 PM UTC Monday, 07 24, 2000 (11:30 AM PDT Monday, Jul 24, 2000).
The largest event to occur this week in this region was a microearthquake of magnitude 2.4, 8 miles WSW of Toms Place, CA at 08:39 AM UTC Thursday, 07 20, 2000 (01:39 AM PDT Thursday, Jul 20, 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 JUL 20 0236 59.27 37 19.09 119 40.78 29.64 12 .07 .4 .7 KAI 2.2D 140 13 NN 2000 JUL 20 0826 2.51 36 54.16 121 1.07 3.25 46 .05 .1 2.1 ORT 2.0D 69 14 NN 2000 JUL 20 0839 0.82 37 32.08 118 48.89 6.67 35 .05 .2 .5 MOR 2.4D 109 4 NN 2000 JUL 20 1320 48.79 38 47.04 122 43.37 2.87 40 .08 .1 .3 GEY 2.7D 39 1 NN 2000 JUL 22 1951 22.79 38 48.21 122 45.23 1.99 38 .07 .1 .3 GEY 2.4D 50 4 NN 2000 JUL 23 1955 6.83 38 48.58 122 47.54 4.99 42 .05 .1 .3 GEY 2.5D 37 0 NN 2000 JUL 24 0431 38.96 40 43.07 124 14.72 10.93 18 .04 .5 .4 EUR 2.2D 180 25 NN 2000 JUL 24 0431 38.96 40 43.07 124 14.72 10.93 18 .04 .5 .4 EUR 2.2D 180 25 NN 2000 JUL 24 1634 19.76 38 46.99 122 46.11 4.22 47 .07 .1 .3 GEY 3.1D 27 4 NN 2000 JUL 24 1830 4.85 36 49.38 121 32.88 6.34 55 .09 .2 .3 SJB 2.7D 26 3 NN 2000 JUL 25 0541 47.71 38 50.09 122 52.84 3.84 33 .07 .1 .4 GEY 2.2D 47 4 NN 2000 JUL 26 1535 24.89 38 49.13 122 47.73 4.36 32 .05 .2 .4 GEY 2.2D 38 1 WW
