Recent Earthquakes in California and Nevada
== PRELIMINARY EARTHQUAKE REPORT ==
U.S. Geological Survey, Menlo Park, California
U.C. Berkeley Seismological Laboratory, Berkeley, California
Version #7: This report supersedes any earlier reports of this event. This event has been reviewed by a seismologist.
A minor earthquake occurred at 6:31:54 PM (PST) on Saturday, December 20, 2025.
The magnitude 3.9 event occurred 5 km (3 miles) N of Dublin, CA.
The hypocentral depth is 10 km ( 6 miles).
| Magnitude | 3.9 - moment magnitude (Mw) |
| Time | Saturday, December 20, 2025 at 6:31:54 PM (PST) Sunday, December 21, 2025 at 2:31:54 (UTC) |
| Distance from |
Dublin, CA - 5 km (3 miles) N (350 degrees) San Ramon, CA - 5 km (3 miles) SE (142 degrees) Blackhawk, CA - 9 km (5 miles) SSW (202 degrees) Diablo, CA - 10 km (6 miles) S (174 degrees) Danville, CA - 10 km (6 miles) SSE (150 degrees) |
| Coordinates | 37 deg. 44.8 min. N (37.747N), 121 deg. 56.7 min. W (121.945W) |
| Depth | 10.03 km (6.20 miles) |
| Quality | Good |
| Location Quality Parameters | Nst=198, Nph=236, Dmin=4.4 km, Rmss=0.20 sec, Erho=0.1 km, Erzz=0.23 km, Gp=14 degrees |
| Event ID# | nc75283691 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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