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 event has been reviewed by a seismologist.
A minor earthquake occurred at 6:53:47 PM (PST) on Saturday, December 20, 2025.
The magnitude 3.0 event occurred 4 km (3 miles) SE of San Ramon, CA.
The hypocentral depth is 10 km ( 6 miles).
| Magnitude | 3.0 - local magnitude (Ml) |
| Time | Saturday, December 20, 2025 at 6:53:47 PM (PST) Sunday, December 21, 2025 at 2:53:47 (UTC) |
| Distance from |
San Ramon, CA - 4 km (3 miles) SE (137 degrees) Dublin, CA - 5 km (3 miles) N (353 degrees) Blackhawk, CA - 8 km (5 miles) SSW (202 degrees) Diablo, CA - 9 km (6 miles) S (172 degrees) Danville, CA - 9 km (6 miles) SSE (148 degrees) |
| Coordinates | 37 deg. 45.0 min. N (37.751N), 121 deg. 56.6 min. W (121.944W) |
| Depth | 9.94 km (6.20 miles) |
| Quality | Fair |
| Location Quality Parameters | Nst=55, Nph=70, Dmin=10.8 km, Rmss=1.10 sec, Erho=1.08 km, Erzz=1.922 km, Gp=29 degrees |
| Event ID# | nc75283726 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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