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 light earthquake of magnitude 4.2, 7 miles WSW of The Geysers, CA at 11:26 PM UTC Tuesday, 01 18, 2000 (03:26 PM PST Tuesday, Jan 18, 2000).
This was the third earthquake as large as M4 to occur in this area within the past eight days. A M4.3 quake occurred in much the same location on January 10. It was followed by a second M4.3 on January 11, also in this same general area. For a fuller discussion of this Cloverdale activity see our webpage at: http://quake.wr.usgs.gov/QUAKES/CURRENT/clover/index.html.
The largest event to occur this week in this region was a minor earthquake of magnitude 3.5, 9 miles ENE of San Jose City Hall, CA at 11:32 PM UTC Monday, 01 17, 2000 (03:32 PM PST Monday, Jan 17, 2000).
The largest event to occur this week in this region was a microearthquake of magnitude 2.8, 8 miles SE of Mammoth Lakes, CA at 08:19 AM UTC Monday, 01 17, 2000 (12:19 AM PST Monday, Jan 17, 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 13 0157 45.01 35 47.41 119 58.80 0.23 10 .07 .4 6.9 COA - 2.1D 145 8 WW 2000 JAN 13 0233 22.89 37 38.64 119 20.10 23.18 18 .05 .8 1.2 KAI 2.3D 95 23 WW 2000 JAN 13 0313 0.54 40 53.80 122 22.68 9.74 8 .13 .5 6.7 SHA 2.9D 131 29 WW 2000 JAN 13 1021 51.78 38 45.23 122 55.03 4.83 26 .10 .2 .8 ROG 2.1D 58 6 WW 2000 JAN 13 1923 52.19 38 46.48 122 43.54 2.09 12 .06 .2 .4 GEY 2.2D 60 1 WW 2000 JAN 13 1942 1.79 38 47.14 122 55.05 4.68 25 .08 .2 .8 GEY 2.2D 45 7 WW 2000 JAN 13 2204 43.14 38 47.17 122 45.58 1.95 19 .04 .2 .4 GEY 2.3D 41 4 WW 2000 JAN 14 0107 32.92 38 47.12 122 55.05 4.53 24 .08 .2 .8 GEY 2.1D 45 7 WW 2000 JAN 14 1026 21.47 39 17.54 122 49.62 5.11 13 .12 .4 2.3 BAR 2.0D 104 18 WW 2000 JAN 14 1955 54.87 37 30.38 118 49.35 2.77 27 .05 .3 1.1 MOR 2.5D 119 5 WW 2000 JAN 15 0234 42.32 38 45.36 122 55.01 5.34 29 .10 .2 .6 ROG 2.5D 57 6 WW 2000 JAN 15 0556 19.72 38 45.28 122 55.02 5.62 26 .08 .2 .6 ROG 2.1D 58 6 WW 2000 JAN 15 1029 32.76 35 59.39 120 32.82 5.30 23 .05 .3 .3 MID 2.3D 86 5 WW 2000 JAN 15 1051 47.39 38 45.17 122 55.05 5.11 24 .08 .2 .8 ROG 2.0D 59 6 WW 2000 JAN 15 1837 52.75 38 49.51 122 49.53 2.45 23 .04 .2 .5 GEY 2.6D 42 3 WW 2000 JAN 15 2034 24.32 37 28.95 118 50.44 6.84 35 .06 .3 .8 MOR 2.3D 122 8 WW 2000 JAN 16 1831 13.02 36 3.85 120 7.34 7.67 40 .18 .2 .2 COA 2.5D 98 1 WW 2000 JAN 16 2031 17.92 38 46.85 122 54.08 5.74 19 .08 .2 .7 GEY 2.0D 62 5 WW 2000 JAN 16 2147 59.50 38 46.79 122 54.94 4.58 24 .07 .2 .7 GEY 2.2D 60 6 WW 2000 JAN 16 2313 37.61 41 1.14 121 24.12 4.74 10 .18 1.816.2 MOD - 2.3D 215 21 WW 2000 JAN 17 0017 0.33 38 44.93 122 55.09 6.10 34 .10 .2 .5 ROG 2.7D 43 7 WW 2000 JAN 17 0206 31.22 38 46.70 122 55.13 4.21 18 .08 .3 1.0 GEY 2.1D 47 7 WW 2000 JAN 17 0333 5.53 39 20.17 122 50.12 8.34 36 .12 .2 .9 BAR 2.8D 110 20 WW 2000 JAN 17 0819 48.66 37 34.93 118 50.97 5.02 32 .08 .3 .5 MOR 2.8D 98 2 WW 2000 JAN 17 1616 46.92 37 33.16 118 48.20 7.23 31 .05 .3 .5 MOR 2.3D 104 4 WW 2000 JAN 17 1847 51.06 36 16.44 120 27.29 9.81 36 .12 .2 .5 COA 2.9D 77 10 WW 2000 JAN 17 1924 51.94 40 25.12 124 38.09 15.23 31 .17 1.6 .7 MEN 3.3D 231 26 WW 2000 JAN 17 2332 55.03 37 22.07 121 43.87 7.41 78 .06 .1 .5 ALU 3.5D 34 3 WW 2000 JAN 18 0109 32.22 39 27.68 122 55.82 12.89 31 .11 .2 .5 BAR 2.6D 62 4 WW 2000 JAN 18 0650 57.25 35 51.47 120 24.16 5.26 24 .04 .2 .3 GOL 2.3D 83 2 WW 2000 JAN 18 1418 9.19 36 2.94 120 35.94 6.83 23 .05 .3 .2 SLA 2.0D 73 2 WW 2000 JAN 18 1830 9.44 36 50.23 121 34.49 8.15 49 .10 .2 .4 SJB 2.1D 33 3 WW 2000 JAN 18 1929 25.57 37 45.01 122 8.90 4.83 59 .09 .1 .3 HAY 2.7D 31 4 WW 2000 JAN 18 2326 1.31 38 45.01 122 54.85 7.41 45 .14 .2 .5 ROG 4.2L 39 6 WW 2000 JAN 18 2341 5.45 38 45.70 122 54.99 5.84 35 .09 .2 .5 GEY 2.6D 38 6 WW 2000 JAN 19 0012 43.76 38 44.95 122 54.93 6.79 33 .10 .2 .6 ROG 2.5D 42 6 WW 2000 JAN 19 0320 13.95 35 51.43 120 24.11 5.34 34 .04 .2 .2 GOL 2.3D 56 2 WW 2000 JAN 19 0341 55.64 38 48.18 122 48.19 2.71 30 .07 .2 .4 GEY 2.5D 37 1 WW 2000 JAN 19 0943 30.20 37 28.55 118 50.32 4.88 33 .07 .3 .9 MOR 2.5D 123 8 WW 2000 JAN 19 1248 37.21 37 22.47 121 44.02 6.13 43 .04 .1 .3 ALU 2.0D 41 3 WW 2000 JAN 19 1442 7.26 38 45.13 122 55.07 3.50 29 .10 .2 1.0 ROG 2.2D 42 6 WW 2000 JAN 19 2259 49.55 36 51.19 121 35.20 7.19 49 .08 .2 .3 SJB 2.2D 40 3 WW
