Recent Earthquakes in California and Nevada
== PRELIMINARY EARTHQUAKE REPORT ==
U.S. Geological Survey, Menlo Park, California
U.C. Berkeley Seismological Laboratory, Berkeley, California
Version #2: This report supersedes any earlier reports of this event. This event has been reviewed by a seismologist.
A minor earthquake occurred at 5:21:23 AM (PST) on Monday, December 8, 2025.
The magnitude 3.0 event occurred 4 km (3 miles) SE of San Ramon, CA.
The hypocentral depth is 9 km ( 5 miles).
| Magnitude | 3.0 - local magnitude (Ml) |
| Time | Monday, December 8, 2025 at 5:21:23 AM (PST) Monday, December 8, 2025 at 13:21:23 (UTC) |
| Distance from |
San Ramon, CA - 4 km (3 miles) SE (131 degrees) Dublin, CA - 6 km (4 miles) N (355 degrees) Blackhawk, CA - 8 km (5 miles) SSW (202 degrees) Diablo, CA - 9 km (6 miles) S (171 degrees) Danville, CA - 9 km (6 miles) SE (145 degrees) |
| Coordinates | 37 deg. 45.2 min. N (37.754N), 121 deg. 56.5 min. W (121.941W) |
| Depth | 8.52 km (5.30 miles) |
| Quality | Fair |
| Location Quality Parameters | Nst=65, Nph=73, Dmin=11.6 km, Rmss=0.69 sec, Erho=1.41 km, Erzz=4.891 km, Gp=27 degrees |
| Event ID# | nc75276526 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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