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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 = Thu May 23 14:00:03 PDT 2019
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
 0.9 2019/05/23 11:02:36 34.039N 117.510W  4.1    4 km ( 2 mi) NW  of Glen Avon, CA
 1.1 2019/05/23 11:00:33 33.845N 117.490W -0.5    1 km ( 1 mi) ESE of Quarry at CORONA  (Probable quarry explosion)
 1.2 2019/05/22 12:37:04 33.862N 117.501W -0.5    1 km ( 1 mi) N   of Quarry at CORONA  (Probable quarry explosion)
 1.2 2019/05/22 01:04:45 34.061N 117.260W 14.9    1 km ( 1 mi) N   of Loma Linda, CA
 1.1 2019/05/21 19:22:37 33.701N 117.496W 13.3    9 km ( 6 mi) ENE of Trabuco Canyon, CA
 1.1 2019/05/21 10:50:17 34.599N 117.352W -1.1    5 km ( 3 mi) WSW of Quarry at ORO-GRANDE  (Probable quarry explosion)
 1.3 2019/05/21 10:15:46 34.025N 117.219W 15.2    5 km ( 3 mi) SE  of Loma Linda, CA
 1.3 2019/05/21 06:53:26 34.130N 118.118W 14.4    1 km ( 1 mi) SSE of Caltech, Pasadena, CA
 1.9 2019/05/21 06:53:19 34.145N 118.125W 15.2    1 km ( 0 mi) N   of Caltech, Pasadena, CA
 1.4 2019/05/20 11:13:01 33.822N 117.478W -0.6    4 km ( 2 mi) SSE of Quarry at CORONA  (Probable quarry explosion)
 2.0 2019/05/20 05:42:17 33.981N 118.341W  9.3    2 km ( 1 mi) SSE of View Park-Windsor Hills, CA
 1.3 2019/05/20 00:37:51 34.152N 117.607W 11.0    4 km ( 3 mi) NW  of Rancho Cucamonga, CA
 1.1 2019/05/19 19:20:26 33.901N 117.795W  8.6    2 km ( 1 mi) NE  of Yorba Linda, CA
 1.3 2019/05/19 17:29:15 33.996N 117.153W 12.5    7 km ( 4 mi) SSE of Redlands, CA
 1.3 2019/05/19 17:28:35 33.994N 117.157W 12.2    7 km ( 5 mi) SSE of Redlands, CA
 1.2 2019/05/19 16:20:42 34.136N 117.317W 10.6    2 km ( 1 mi) WNW of San Bernardino, CA
 0.9 2019/05/19 05:11:15 33.445N 117.759W 16.3    6 km ( 4 mi) WSW of Dana Point, CA
 0.9 2019/05/19 02:26:25 34.043N 117.506W  4.5    4 km ( 2 mi) NNW of Glen Avon, CA
 1.2 2019/05/19 00:04:50 34.086N 117.306W 16.7    2 km ( 1 mi) NNE of Colton, CA
 1.1 2019/05/18 20:27:05 33.989N 117.237W 12.5    7 km ( 4 mi) N   of Moreno Valley, CA
 1.9 2019/05/18 13:08:16 34.079N 118.816W 12.5    7 km ( 5 mi) SSW of Agoura Hills, CA
 1.0 2019/05/17 15:05:23 33.101N 117.013W -0.3    8 km ( 5 mi) N   of Quarry at CPE-2  (Probable quarry explosion)
 1.1 2019/05/17 13:46:21 33.861N 117.505W -0.5    1 km ( 1 mi) NNW of Quarry at CORONA  (Probable quarry explosion)
 0.9 2019/05/17 05:35:47 33.574N 117.217W 17.3    2 km ( 1 mi) N   of Murrieta, CA
 1.5 2019/05/17 03:27:12 34.841N 118.969W 14.5    3 km ( 2 mi) NW  of Frazier Park, CA
 1.8 2019/05/17 00:16:45 33.529N 117.295W 17.7    8 km ( 5 mi) S   of Wildomar, CA
 1.5 2019/05/16 23:35:49 33.894N 118.163W 19.5    1 km ( 0 mi) NW  of Paramount, CA
 1.0 2019/05/16 17:11:37 34.018N 117.223W 16.5    5 km ( 3 mi) SE  of Loma Linda, 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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