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 3.2, 1 miles NNE of Punta Gorda, CA at 09:17 AM UTC Tuesday, 01 04, 2000 (01:17 AM PST Tuesday, Jan 04, 2000).
The largest event to occur this week in this region was a microearthquake of magnitude 2.4, 5 miles E of Watsonville, CA at 11:29 PM UTC Friday, 12 31, 1999 (03:29 PM PST Friday, Dec 31, 1999).
The largest event to occur this week in this region was a microearthquake of magnitude 2.1, 3 miles SSE of Toms Place, CA at 11:57 PM UTC Thursday, 12 30, 1999 (03:57 PM PST Thursday, Dec 30, 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 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 1999 DEC 30 0732 52.86 39 5.70 121 24.80 17.75 22 .08 .4 .7 AUB 2.2D 127 15 NN 1999 DEC 30 2357 34.75 37 31.47 118 40.24 14.27 35 .07 .3 .7 WCN 2.1D 67 6 NN 1999 DEC 31 0621 50.01 37 29.69 118 49.88 8.11 32 .05 .3 .6 MOR 2.1D 171 7 NN 1999 DEC 31 2329 44.19 36 54.51 121 39.38 10.24 70 .07 .1 .3 SJB 2.4D 34 5 NN 2000 JAN 4 0917 22.20 40 16.60 124 21.43 20.94 17 .11 1.1 .4 MEN 3.2D 212 18 WW 2000 JAN 4 1348 10.01 36 38.39 121 15.38 3.81 51 .12 .2 .6 STN 2.6D 40 3 WW 2000 JAN 4 2057 5.78 36 55.07 122 12.10 5.25 38 .11 .4 1.0 MON 2.2D 200 16 WW 2000 JAN 5 0656 35.52 38 47.46 122 45.40 1.88 25 .04 .1 .5 GEY 2.4D 41 4 WW
