Recent Earthquakes in California and Nevada
== PRELIMINARY EVENT REPORT ==
Southern California Seismic Network: a cooperative project of
U.S. Geological Survey, Pasadena California
Caltech Seismological Laboratory, Pasadena, California
Version #9: This report supersedes any earlier reports of this event. This event has been reviewed by a seismologist.
A micro quarry occurred at 11:34:28 AM (PDT) on Monday, October 20, 2025.
The magnitude 1.4 event (a probable quarry explosion) occurred 10 km (6 miles) NNW of Big Bear City, CA.
The hypocentral depth is -2 km (-1 miles).
| Magnitude | 1.4 - local magnitude (Ml) |
| Time | Monday, October 20, 2025 at 11:34:28 AM (PDT) Monday, October 20, 2025 at 18:34:28 (UTC) |
| Distance from |
Big Bear City, CA - 10 km (6 miles) NNW (337 degrees) Big Bear Lake, CA - 11 km (7 miles) N (11 degrees) Lucerne Valley, CA - 13 km (8 miles) SE (146 degrees) Running Springs, CA - 25 km (16 miles) NE (53 degrees) Lake Arrowhead, CA - 30 km (18 miles) ENE (69 degrees) |
| Coordinates | 34 deg. 20.7 min. N (34.344N), 116 deg. 53.3 min. W (116.888W) |
| Depth | -1.75 km (-1.10 miles) |
| Quality | Fair |
| Location Quality Parameters | Nst=34, Nph=38, Dmin=5.5 km, Rmss=0.21 sec, Erho=0.34 km, Erzz=31.61 km, Gp=47 degrees |
| Event ID# | ci41111775 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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