Recent Earthquakes in California and Nevada
== PRELIMINARY EARTHQUAKE REPORT ==
U.S. Geological Survey, Menlo Park, California
U.C. Berkeley Seismological Laboratory, Berkeley, California
Version #4: This report supersedes any earlier reports of this event. This event has been reviewed by a seismologist.
A minor earthquake occurred at 9:07:58 AM (PST) on Monday, December 8, 2025.
The magnitude 3.6 event occurred 4 km (2 miles) SE of San Ramon, CA.
The hypocentral depth is 10 km ( 6 miles).
| Magnitude | 3.6 - local magnitude (Ml) |
| Time | Monday, December 8, 2025 at 9:07:58 AM (PST) Monday, December 8, 2025 at 17:07:58 (UTC) |
| Distance from |
San Ramon, CA - 4 km (2 miles) SE (130 degrees) Dublin, CA - 6 km (4 miles) N (353 degrees) Blackhawk, CA - 8 km (5 miles) SSW (205 degrees) Diablo, CA - 9 km (5 miles) S (172 degrees) Danville, CA - 9 km (5 miles) SE (146 degrees) |
| Coordinates | 37 deg. 45.5 min. N (37.758N), 121 deg. 56.7 min. W (121.945W) |
| Depth | 9.62 km (6.00 miles) |
| Quality | Excellent |
| Location Quality Parameters | Nst=152, Nph=171, Dmin=3.4 km, Rmss=0.13 sec, Erho=0.1 km, Erzz=0.22 km, Gp=17 degrees |
| Event ID# | nc75276661 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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