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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 Nov 20 22:00:04 PST 2009
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

 1.5  2009/11/18 16:18:48 40.497N 122.235W 16.3    7 km ( 5 mi) NE  of Anderson, CA
 1.5  2009/11/18 01:58:02 41.458N 121.996W 27.7   16 km (10 mi) SSW of Tennant, CA
 1.6  2009/11/16 05:03:51 40.456N 121.549W  5.1   13 km ( 8 mi) ESE of Viola, CA
 0.5  2009/11/15 14:58:46 40.455N 121.555W  4.2   12 km ( 8 mi) SE  of Viola, CA
 1.7  2009/11/15 14:56:26 40.457N 121.549W  4.9   13 km ( 8 mi) ESE of Viola, CA
 0.5  2009/11/15 14:55:04 40.456N 121.551W  4.8   13 km ( 8 mi) ESE of Viola, CA
 0.9  2009/11/15 14:16:35 40.463N 121.551W  4.6   12 km ( 8 mi) ESE of Viola, CA
 1.3  2009/11/15 02:42:24 40.462N 121.519W  4.3   15 km ( 9 mi) ESE of Viola, CA
 1.4  2009/11/15 02:41:21 40.474N 121.512W  4.9   15 km ( 9 mi) ESE of Viola, CA
 1.1  2009/11/13 22:55:30 40.453N 121.535W  5.4   14 km ( 9 mi) ESE of Viola, CA

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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)