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@andreas.wr.usgs.gov
Information about seismicity for other regions is available from the U.S. Geological Survey Earthquake Hazards Program Website. 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 provided at the Northern California Maps of Recent Earthquake Activity website. 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 microearthquake of magnitude 2.8, 8 miles WSW of Toms Place, CA at 04:42 PM UTC Tuesday, 07 19, 2005 (09:42 AM PDT Tuesday, Jul 19, 2005).
The largest event to occur this week in this region was a microearthquake of magnitude 1.8, 4 miles ENE of Danville, CA at 02:24 AM UTC Thursday, 07 14, 2005 (07:24 PM PDT Wednesday, Jul 13, 2005).
The largest event to occur this week in this region was a microearthquake of magnitude 2.8, 8 miles WSW of Toms Place, CA at 04:42 PM UTC Tuesday, 07 19, 2005 (09:42 AM PDT Tuesday, Jul 19, 2005).
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 2005 JUL 14 0218 35.81 38 49.26 122 48.67 3.08 32 .07 .2 .4 GEY 2.2D 43 2 WW 2005 JUL 14 1402 22.80 35 35.63 120 48.36 3.31 15 .09 1.7 2.5 ROB 2.0D 214 7 WW 2005 JUL 14 1711 25.29 40 33.78 122 13.83 21.69 9 .02 .7 1.0 SHA 2.2D 121 20 WW 2005 JUL 15 0059 14.75 36 2.20 120 35.82 5.06 47 .07 .2 .3 SLA 2.0D 44 4 XX 2005 JUL 15 1225 22.41 36 30.08 120 37.00 0.11 44 .15 .3 2.6 CRV # 2.0D 68 31 NN 2005 JUL 15 1315 26.03 38 45.30 122 26.72 7.10 31 .16 .2 .7 GVL 2.2D 46 6 AA 2005 JUL 16 0010 50.17 35 43.53 121 5.72 5.47 24 .07 .2 .5 SSM 2.0D 80 7 XX 2005 JUL 16 0333 13.43 35 59.07 120 32.56 2.32 46 .08 .2 .3 MID 2.1D 40 1 KX 2005 JUL 17 0035 10.64 37 32.74 118 49.81 2.17 40 .08 .2 .9 MOR 2.2D 92 5 II 2005 JUL 17 0351 8.80 38 49.37 122 48.54 3.28 34 .08 .2 .5 GEY 2.1D 42 2 WW 2005 JUL 17 0710 57.54 35 53.87 120 26.49 6.11 45 .08 .1 .3 GOL # 2.6D 45 4 WW 2005 JUL 17 1010 45.18 37 32.66 118 49.88 1.30 27 .08 .3 .6 MOR 2.1D 140 5 WW 2005 JUL 17 1520 20.42 38 49.53 122 48.61 2.72 29 .08 .3 .4 GEY 2.1D 62 2 WW 2005 JUL 18 1243 39.31 38 48.27 122 48.74 3.37 20 .07 .3 .6 GEY 2.2D 125 2 YW 2005 JUL 18 2348 55.69 36 4.28 120 38.89 5.05 47 .10 .2 .5 SLA 2.7D 68 12 WW 2005 JUL 19 1642 37.79 37 31.45 118 49.31 4.04 38 .06 .2 .7 MOR 2.8D 98 5 WW 2005 JUL 20 0804 35.72 38 48.73 122 47.33 5.21 9 .03 .3 .9 GEY 2.0D 142 9 WI 2005 JUL 20 1837 47.42 39 31.93 121 58.24 0.36 8 .16 1.1 8.3 SAC 2.1D 155 34 WW
