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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 = Mon Jan 20 16:00:01 PST 2020
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

 0.5 2020/01/20 06:04:10 39.771N 120.589W 15.5   11 km ( 7 mi) WSW of Portola, CA
 0.5 2020/01/20 04:06:03 39.447N 120.296W 11.8   16 km (10 mi) NW  of Truckee, CA
 -0.2 2020/01/20 04:05:26 39.445N 120.284W 11.2   16 km (10 mi) NW  of Truckee, CA
 0.5 2020/01/18 16:44:23 39.425N 119.718W 10.1   13 km ( 8 mi) SSE of Sparks, NV
 0.9 2020/01/17 18:52:59 39.932N 120.772W  7.1   11 km ( 7 mi) E   of East Quincy, CA

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

Data Sources

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