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, 10 miles WSW of Toms Place, CA at 06:44 AM UTC Saturday, 04 22, 2000 (11:44 PM PDT Friday, Apr 21, 2000).
The largest event to occur this week in this region was an earthquake of magnitude 2.5, 2 miles SW of San Juan Bautista, CA at 06:05 AM UTC Wednesday, 04 26, 2000 (11:05 PM PDT Tuesday, Apr 25, 2000).
The largest event to occur this week in this region was a minor earthquake of magnitude 3.1, 10 miles WSW of Toms Place, CA at 06:44 AM UTC Saturday, 04 22, 2000 (11:44 PM PDT Friday, Apr 21, 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 APR 20 0004 43.82 40 20.24 124 22.91 26.79 18 .07 .9 .5 MEN 2.2D 222 16 NN 2000 APR 20 1127 50.12 39 24.38 123 4.40 4.49 42 .12 .2 1.0 BAR 2.7D 53 16 NN 2000 APR 20 1141 31.69 39 24.36 123 4.40 4.70 34 .08 .1 1.0 BAR 2.4D 54 16 NN 2000 APR 20 1206 40.58 39 24.30 123 4.32 5.93 35 .10 .2 .8 BAR 3.1D 54 16 NN 2000 APR 20 1501 14.89 39 24.17 123 4.51 2.60 22 .08 .2 2.1 BAR 2.2D 58 16 NN 2000 APR 20 1700 51.04 38 49.26 122 47.86 4.56 43 .05 .1 .2 GEY 2.6D 37 1 NN 2000 APR 21 0909 30.56 35 56.99 120 3.26 29.06 24 .09 .5 .7 COA 2.1D 141 13 NN 2000 APR 21 1137 34.29 38 49.26 122 48.15 4.29 35 .04 .1 .3 GEY 2.1D 35 2 NN 2000 APR 21 1824 35.23 37 33.66 118 48.80 1.90 34 .06 .2 .4 MOR 2.1D 102 4 NN 2000 APR 22 0644 22.75 37 29.28 118 50.37 3.94 37 .07 .2 .8 MOR 3.1D 78 8 NN 2000 APR 22 0908 12.51 37 28.93 118 50.39 4.44 35 .06 .2 .6 MOR 2.1D 79 8 NN 2000 APR 22 1934 55.03 37 29.09 118 50.29 7.66 30 .05 .3 .7 MOR 2.1D 121 8 WW 2000 APR 23 0434 55.42 40 18.32 124 31.71 21.90 28 .08 .9 .3 MEN 2.5D 229 25 NN 2000 APR 23 1326 25.24 39 28.94 123 0.40 10.65 25 .08 .2 .4 BAR 2.1D 48 7 NN 2000 APR 24 0544 37.42 37 9.88 122 0.27 12.38 52 .06 .1 .2 BLM 2.0D 59 2 NN 2000 APR 25 0452 25.45 37 28.83 118 50.39 5.02 35 .05 .2 .6 MOR 2.5D 79 8 NN 2000 APR 25 0504 42.22 38 47.67 122 48.54 4.52 22 .05 .2 .4 GEY 2.0D 38 2 WW 2000 APR 26 0459 9.41 40 14.59 124 9.52 10.89 10 .06 .5 .5 MEN 2.1D 136 6 WW 2000 APR 26 0605 45.39 36 49.80 121 33.42 6.24 46 .09 .2 .4 SJB 2.5D 27 4 WW 2000 APR 26 1334 6.82 36 36.29 121 12.97 8.94 29 .06 .2 .5 PIN 2.1D 42 4 WW
