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
The largest event to occur this week in this region was a light earthquake of magnitude 4.4, 16 miles WNW of Eureka, CA at 10:50 AM UTC Friday, 09 22, 2000 (03:50 AM PDT Friday, Sep 22, 2000).
This earthquake occurred offshore and was widely felt by residents living near Eureka. The earthquake occurred on a vertical fault exhibiting strike slip motion. The quake most likely occurred in the subducting Gorda plate. This area has experienced other large earthquakes, most notably the M5.4 on 12/26/1994.
The largest event to occur this week in this region was an earthquake of magnitude 2.9, 5 miles WNW of San Juan Bautista, CA at 02:18 PM UTC Tuesday, 09 26, 2000 (07:18 AM PDT Tuesday, Sep 26, 2000).
The largest event to occur this week in this region was a microearthquake of magnitude 2.2, 10 miles WSW of Toms Place, CA at 08:27 AM UTC Wednesday, 09 27, 2000 (01:27 AM PDT Wednesday, Sep 27, 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 SEP 21 0131 17.32 36 33.12 121 5.92 1.03 30 .08 .1 .7 BVL 2.0D 44 5 NN 2000 SEP 21 1806 24.50 36 49.85 121 17.69 5.13 54 .05 .1 .2 QUI 2.2D 46 2 NN 2000 SEP 21 1807 34.14 35 50.82 120 23.67 6.92 42 .05 .1 .2 GOL 2.7D 87 1 NN 2000 SEP 21 1808 58.61 35 50.87 120 23.67 7.13 46 .05 .1 .2 GOL 3.3D 69 1 NN 2000 SEP 21 1809 59.75 35 50.72 120 23.56 6.90 36 .05 .2 .2 GOL 2.6D 68 4 NN 2000 SEP 21 2125 28.88 39 23.83 123 17.19 6.75 22 .08 .2 .4 MAA 2.0D 51 5 NN 2000 SEP 22 0023 17.36 36 34.45 121 10.08 5.89 58 .05 .1 .3 PIN 2.5D 36 2 NN 2000 SEP 22 1050 27.19 40 51.16 124 27.71 13.07 95 .18 .5 .5 EUR 4.4L 225 33 NN 2000 SEP 22 1827 59.81 40 51.75 124 23.68 16.35 42 .08 .4 .3 EUR 3.1D 221 27 NN 2000 SEP 22 1856 14.85 38 46.77 122 45.87 2.36 30 .05 .1 .3 GEY 2.2D 45 4 NN 2000 SEP 23 0249 32.55 38 41.85 122 45.33 7.40 46 .07 .1 .3 NAP 2.5D 39 1 NN 2000 SEP 23 0929 50.85 38 48.83 122 47.91 2.34 37 .04 .1 .2 GEY 2.2D 36 1 NN 2000 SEP 23 2316 52.87 37 53.61 122 13.13 7.55 69 .09 .1 .3 HAY 2.1D 32 1 NN 2000 SEP 24 0128 35.05 39 49.23 122 39.93 4.75 27 .23 .4 3.3 SAC 2.3D 101 11 NN 2000 SEP 24 0802 46.99 36 34.05 121 8.81 9.98 51 .05 .1 .2 PIN 2.2D 44 4 NN 2000 SEP 26 0023 8.49 38 48.36 122 46.42 2.51 21 .04 .2 .4 GEY 2.2D 43 2 WW 2000 SEP 26 1418 37.17 36 53.05 121 37.17 7.04 66 .10 .2 .3 SJB 2.9D 52 2 NN 2000 SEP 27 0827 53.09 37 29.08 118 50.38 6.04 32 .05 .2 .9 MOR 2.2D 121 8 WW 2000 SEP 27 1018 55.26 37 51.01 122 13.93 5.60 51 .09 .1 .3 HAY 2.3D 32 4 WW 2000 SEP 27 1851 31.94 38 49.07 122 47.49 5.01 41 .05 .1 .3 GEY 3.2L 39 1 WW
