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Maps are updated within about 5 minutes of an earthquake or once an hour.
Brown lines represent known hazardous faults or fault zones. White lines are roads.
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Update time = Fri Sep 3 13:00:08 PDT 2010
Here are the earthquakes appearing on this map, most recent at top ...

 MAG    DATE    LOCAL-TIME  LAT     LON    DEPTH    LOCATION
        y/m/d     h:m:s     deg     deg     km

 0.8  2010/09/03 04:46:41 39.347N 119.999W  5.4   12 km ( 8 mi) N   of Kings Beach, CA
 1.4  2010/09/02 19:20:29 39.131N 119.621W  8.8   12 km ( 7 mi) SSW of Dayton, NV
 1.3  2010/09/02 12:59:30 39.698N 120.713W 12.6   24 km (15 mi) WSW of Portola, CA
 1.3  2010/08/31 20:29:00 39.878N 120.480W  9.3    8 km ( 5 mi) N   of Portola, CA
 0.6  2010/08/31 15:27:08 39.431N 120.289W  7.8   15 km ( 9 mi) NW  of Truckee, CA
 0.1  2010/08/31 01:01:28 39.322N 119.987W  6.8   10 km ( 6 mi) NNE of Kings Beach, CA
 2.0  2010/08/30 18:14:15 40.331N 119.729W 10.0   14 km ( 9 mi) SSW of Smoke Creek, NV
 2.1  2010/08/29 20:25:50 39.240N 120.490W  6.2   28 km (18 mi) WSW of Truckee, CA
 1.4  2010/08/29 11:37:26 39.252N 120.521W 18.1   30 km (19 mi) WSW of Truckee, CA

Special maps:
Long Valley || Los Angeles || San Francisco Index map || big earthquake list || all earthquake list || glossary of terms ||

Data Sources

Northern California - USGS = U.S. Geological Survey, Menlo Park
Northern California - UCB = University of California, Berkeley
Southern California - USGS = U.S. Geological Survey, Pasadena
Southern California - Caltech = California Institute of Technology
Southern California - UCSD = University of California, San Diego
Nevada - UNR = University of Nevada, Reno
US and World - USGS/NEIC = National Earthquake Information Center
Offshore = West Coast & Alaska Tsunami Warning Center
...all members of the Advanced National Seismic System (ANSS)