Recent Earthquakes in California and Nevada
== PRELIMINARY EARTHQUAKE REPORT ==
U.S. Geological Survey, Menlo Park, California
U.C. Berkeley Seismological Laboratory, Berkeley, California
Version #0: This report supersedes any earlier reports of this event. This is a computer-generated message. This event has not yet been reviewed by a seismologist.
A micro earthquake occurred at 0:30:43 AM (PST) on Monday, December 15, 2025.
The magnitude 1.9 event occurred 12 km (8 miles) WSW of Chester, CA.
The hypocentral depth is 7 km ( 4 miles).
| Magnitude | 1.9 - duration magnitude (Md) |
| Time | Monday, December 15, 2025 at 0:30:43 AM (PST) Monday, December 15, 2025 at 8:30:43 (UTC) |
| Distance from |
Chester, CA - 12 km (8 miles) WSW (251 degrees) Greenville, CA - 38 km (24 miles) WNW (292 degrees) Shingletown, CA - 50 km (31 miles) ESE (119 degrees) Forest Ranch, CA - 50 km (31 miles) NNE (31 degrees) Quincy, CA - 52 km (32 miles) NW (316 degrees) |
| Coordinates | 40 deg. 16.2 min. N (40.270N), 121 deg. 22.2 min. W (121.370W) |
| Depth | 6.83 km (4.20 miles) |
| Quality | Fair |
| Location Quality Parameters | Nst=11, Nph=10, Dmin=14.9 km, Rmss=0.12 sec, Erho=0.53 km, Erzz=2.04999995 km, Gp=120 degrees |
| Event ID# | nc75280191 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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