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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 = Wed Oct 23 5:00:02 PDT 2019
Here are the earthquakes appearing on this map, most recent at top ...

        y/m/d     h:m:s     deg     deg     km
 2.2 2019/10/20 19:30:30 40.242N 121.396W  3.9   16 km (10 mi) WSW of Chester, CA
 2.2 2019/10/20 19:07:21 40.242N 121.394W  3.6   16 km (10 mi) WSW of Chester, CA
 1.3 2019/10/19 22:45:45 40.215N 121.489W  4.0   24 km (15 mi) WSW of Chester, CA
 1.1 2019/10/18 15:09:13 40.156N 121.084W 10.0   11 km ( 7 mi) W   of Greenville, CA
 2.1 2019/10/17 01:03:00 40.202N 121.478W  7.6   24 km (15 mi) WSW of Chester, CA

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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)

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