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 3.6, 8 miles SE of Mammoth Lakes, CA at 04:39 AM UTC Friday, 01 21, 2000 (08:39 PM PST Thursday, Jan 20, 2000).
The largest event to occur this week in this region was a microearthquake of magnitude 2.6, 4 miles NW of Glen Ellen, CA at 10:45 AM UTC Tuesday, 01 25, 2000 (02:45 AM PST Tuesday, Jan 25, 2000).
The largest event to occur this week in this region was a minor earthquake of magnitude 3.6, 8 miles SE of Mammoth Lakes, CA at 04:39 AM UTC Friday, 01 21, 2000 (08:39 PM PST Thursday, Jan 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 JAN 20 0021 45.64 37 31.98 118 48.92 5.96 29 .03 .3 .6 MOR 2.2D 129 6 WW 2000 JAN 20 0354 35.25 38 44.70 122 55.15 6.02 27 .09 .2 .6 ROG 2.3D 43 7 WW 2000 JAN 20 1435 28.81 37 51.62 122 14.04 8.71 37 .06 .1 .3 HAY 2.1D 31 3 WW 2000 JAN 20 1652 25.51 37 36.49 118 56.00 6.87 29 .07 .3 .4 SHE 2.2D 89 2 WW 2000 JAN 20 2333 13.26 40 9.93 124 23.97 0.08 24 .33 1.4 4.4 MEN # 3.0D 229 19 WW 2000 JAN 21 0258 14.24 38 31.60 122 38.48 6.46 35 .09 .2 .4 NAP 2.3D 31 3 WW 2000 JAN 21 0422 25.47 37 34.34 118 51.62 9.56 31 .06 .3 .5 MOR 2.8D 100 3 WW 2000 JAN 21 0439 50.11 37 34.23 118 51.68 9.53 31 .05 .3 .4 MOR 3.6D 100 4 WW 2000 JAN 21 0540 55.82 37 34.32 118 51.69 9.48 32 .06 .3 .5 MOR 2.9D 100 3 WW 2000 JAN 21 0610 9.42 37 34.08 118 51.80 9.57 30 .04 .3 .4 MOR 2.1D 100 4 WW 2000 JAN 21 1725 16.93 38 49.05 122 47.75 1.04 10 .03 .2 .4 GEY 2.1D 101 1 WW 2000 JAN 22 0535 5.89 37 34.25 118 51.58 9.47 33 .05 .3 .5 MOR 2.8D 100 3 WW 2000 JAN 23 0848 3.34 38 49.09 122 50.35 0.93 11 .04 .2 .6 GEY 2.2D 77 4 WW 2000 JAN 23 1646 12.26 37 35.64 118 48.22 7.91 32 .06 .3 .5 MOR 2.6D 78 2 WW 2000 JAN 23 1711 43.05 38 48.61 122 47.97 2.27 19 .05 .2 .3 GEY 2.2D 42 0 WW 2000 JAN 24 0001 25.46 36 8.16 121 36.21 10.73 32 .05 .4 1.1 SUR 2.2D 164 18 WW 2000 JAN 24 2353 22.14 36 35.19 121 10.97 4.71 48 .06 .1 .3 PIN 2.6D 32 1 WW 2000 JAN 25 0828 49.40 39 19.29 122 48.42 6.35 14 .03 .3 1.6 BAR 2.2D 114 22 WW 2000 JAN 25 1045 41.99 38 24.35 122 33.96 7.59 43 .09 .2 .4 NAP 2.6D 35 6 WW 2000 JAN 25 1328 24.42 38 45.17 122 55.03 6.27 28 .09 .2 .6 ROG 2.1D 42 6 WW 2000 JAN 25 1431 33.85 36 44.72 121 24.97 6.67 46 .14 .2 .4 SJB 2.2D 27 0 WW 2000 JAN 25 1712 24.61 36 34.36 121 9.95 5.52 44 .06 .2 .4 PIN 2.3D 37 2 WW 2000 JAN 26 0706 40.72 37 33.04 118 45.20 10.16 29 .06 .3 .6 WCN 2.5D 67 3 WW 2000 JAN 26 0728 9.66 37 34.19 118 51.56 9.68 30 .04 .3 .4 MOR 2.0D 100 3 WW 2000 JAN 26 1154 6.06 38 48.73 122 48.77 4.08 20 .03 .2 .4 GEY 2.0D 62 2 WW 2000 JAN 26 2148 55.42 37 22.45 118 36.41 17.34 30 .05 .3 .7 KAI 2.5L 138 5 WW 2000 JAN 26 2305 51.06 37 31.85 118 49.00 5.41 26 .05 .3 .5 MOR 2.1D 111 4 WW
