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 3.3, 6 miles SW of Lake Pillsbury, CA at 11:21 PM UTC Monday, 05 29, 2000 (04:21 PM PDT Monday, May 29, 2000).
This earthquake is a continuation of the sequence that began on April 20, 2000. To date, the largest event has been the M 4.1 earthquake of May 17. The sequence continues to produce many smaller quakes. There have been 128 events recorded since April 20.
The largest event to occur this week in this region was a microearthquake of magnitude 2.6, 3 miles WSW of Cupertino, CA at 02:10 AM UTC Tuesday, 05 30, 2000 (07:10 PM PDT Monday, May 29, 2000).
The largest event to occur this week in this region was a microearthquake of magnitude 2.3, 8 miles W of Toms Place, CA at 10:26 PM UTC Saturday, 05 27, 2000 (03:26 PM PDT Saturday, May 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 MAY 25 0001 19.02 39 22.44 123 3.02 6.12 29 .09 .2 1.1 BAR 2.3D 58 17 NN 2000 MAY 25 0023 30.49 39 22.48 123 3.48 6.94 36 .08 .1 .8 BAR 2.3D 56 17 NN 2000 MAY 25 0423 24.67 36 49.12 121 32.53 6.71 58 .09 .2 .3 SJB 2.3D 31 4 NN 2000 MAY 25 1935 40.37 39 22.20 123 3.06 2.75 17 .08 .2 2.8 BAR 2.2D 57 17 NN 2000 MAY 25 2349 28.62 39 22.19 123 3.18 6.79 32 .08 .2 .8 BAR 2.5D 57 17 NN 2000 MAY 26 0621 15.74 37 59.39 122 10.91 9.10 62 .17 .2 .3 CON 2.2D 41 3 NN 2000 MAY 26 1423 20.40 37 57.10 122 43.31 7.67 36 .09 .2 .4 MAR 2.3D 105 3 WW 2000 MAY 26 1655 27.80 37 18.00 118 42.21 6.92 8 .07 1.9 8.4 KAI - 2.3D 225 21 WW 2000 MAY 26 2304 48.33 39 21.62 123 2.88 6.37 30 .08 .2 .8 BAR 2.4D 56 18 NN 2000 MAY 27 0026 26.83 38 48.17 122 47.15 1.05 32 .03 .1 .2 GEY 2.5D 48 1 NN 2000 MAY 27 1430 34.63 39 21.85 123 3.01 0.02 46 .18 .2 1.8 BAR # 2.7D 57 18 NN 2000 MAY 27 1829 7.66 36 34.77 121 10.44 5.67 48 .05 .1 .3 PIN 2.3D 28 2 NN 2000 MAY 27 1959 21.33 39 21.82 123 2.97 7.40 30 .07 .2 .9 BAR 2.0D 57 18 NN 2000 MAY 27 2226 39.25 37 33.04 118 49.26 4.64 33 .07 .2 .5 MOR 2.3D 105 4 NN 2000 MAY 27 2303 20.10 39 21.93 123 3.15 6.58 24 .06 .2 1.2 BAR 2.0D 57 18 NN 2000 MAY 28 1529 28.92 39 22.64 123 3.64 7.37 29 .08 .2 .7 BAR 2.1D 57 17 NN 2000 MAY 28 2253 14.24 39 6.10 123 5.48 8.42 30 .08 .2 .4 MAA 2.3D 33 3 NN 2000 MAY 29 0120 42.68 40 33.05 123 8.26 32.00 16 .11 .4 .8 KLA 2.3D 69 14 NN 2000 MAY 29 1656 20.65 39 21.46 123 2.78 7.30 29 .07 .2 .9 BAR 2.2D 57 18 NN 2000 MAY 29 2321 33.95 39 20.99 123 2.49 6.83 47 .14 .2 .7 BAR 3.3D 57 19 NN 2000 MAY 29 2331 48.26 39 21.09 123 2.65 1.15 29 .09 .2 8.3 BAR - 2.3D 57 19 NN 2000 MAY 30 0210 58.51 37 18.43 122 4.67 4.97 74 .11 .1 .3 BLM 2.6D 32 3 NN 2000 MAY 30 0328 49.35 36 18.19 120 25.05 11.15 33 .07 .2 .2 COA 2.2D 89 6 NN 2000 MAY 30 0750 59.38 39 21.50 123 2.77 7.56 39 .07 .1 .7 BAR 2.6D 57 18 NN 2000 MAY 30 0817 19.96 37 20.66 121 42.51 7.63 50 .05 .1 .4 ALU 2.1D 52 5 WW 2000 MAY 30 0821 33.28 37 20.74 121 42.61 8.06 68 .04 .1 .2 ALU 2.1D 38 4 NN 2000 MAY 30 1031 7.59 40 19.70 124 23.08 7.24 10 .21 1.4 1.2 MEN 2.5D 229 17 WW 2000 MAY 30 1447 21.58 39 21.49 123 2.79 7.83 39 .09 .2 .7 BAR 2.8D 57 18 NN 2000 MAY 30 2347 2.81 37 30.63 118 25.28 9.28 27 .05 .3 .7 CHV 2.4D 106 5 WW 2000 MAY 31 0028 34.91 37 30.60 118 25.11 9.24 30 .07 .3 .8 CHV 2.3D 108 5 WW 2000 MAY 31 0114 59.42 39 21.81 123 2.84 5.45 26 .09 .2 1.1 BAR 2.4D 57 18 WW 2000 MAY 31 2150 11.36 38 48.15 122 48.29 4.52 20 .07 .2 .5 GEY 2.1D 55 1 WW
