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 #8: This report supersedes any earlier reports of this event. This event has been reviewed by a seismologist.
A micro quarry occurred at 1:28:10 PM (PST) on Monday, December 22, 2025.
The magnitude 0.9 event (a probable quarry explosion) occurred 5 km (3 miles) NNW of Azusa, CA.
The hypocentral depth is -0.33 km (-0.20 miles).
| Magnitude | 0.9 - local magnitude (Ml) |
| Time | Monday, December 22, 2025 at 1:28:10 PM (PST) Monday, December 22, 2025 at 21:28:10 (UTC) |
| Distance from |
Azusa, CA - 5 km (3 miles) NNW (346 degrees) Bradbury, CA - 6 km (4 miles) NE (53 degrees) Duarte, CA - 7 km (4 miles) NE (50 degrees) Glendora, CA - 7 km (4 miles) NW (313 degrees) Monrovia, CA - 8 km (5 miles) ENE (65 degrees) |
| Coordinates | 34 deg. 10.7 min. N (34.178N), 117 deg. 55.2 min. W (117.921W) |
| Depth | -0.33 km (-0.20 miles) |
| Quality | Good |
| Location Quality Parameters | Nst=15, Nph=15, Dmin=4.8 km, Rmss=0.15 sec, Erho=0.42 km, Erzz=0.76 km, Gp=112 degrees |
| Event ID# | ci41145639 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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