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 #6: This report supersedes any earlier reports of this event. This event has been reviewed by a seismologist.
A micro quarry occurred at 11:18:17 AM (PST) on Friday, December 19, 2025.
The magnitude 1.1 event (a probable quarry explosion) occurred 5 km (3 miles) NNW of Azusa, CA.
The hypocentral depth is -1 km (-1 miles).
| Magnitude | 1.1 - local magnitude (Ml) |
| Time | Friday, December 19, 2025 at 11:18:17 AM (PST) Friday, December 19, 2025 at 19:18:17 (UTC) |
| Distance from |
Azusa, CA - 5 km (3 miles) NNW (342 degrees) Bradbury, CA - 6 km (3 miles) NE (50 degrees) Duarte, CA - 7 km (4 miles) NE (47 degrees) Glendora, CA - 7 km (5 miles) NW (311 degrees) Monrovia, CA - 8 km (5 miles) ENE (63 degrees) |
| Coordinates | 34 deg. 10.7 min. N (34.179N), 117 deg. 55.5 min. W (117.925W) |
| Depth | -0.91 km (-0.60 miles) |
| Quality | Fair |
| Location Quality Parameters | Nst=13, Nph=13, Dmin=5.3 km, Rmss=0.13 sec, Erho=0.39 km, Erzz=31.61 km, Gp=104 degrees |
| Event ID# | ci41143015 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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