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 3:00:40 AM (PST) on Monday, December 8, 2025.
The magnitude 2.2 event occurred 4 km (3 miles) SE of San Ramon, CA.
The hypocentral depth is 8 km ( 5 miles).
| Magnitude | 2.2 - duration magnitude (Md) |
| Time | Monday, December 8, 2025 at 3:00:40 AM (PST) Monday, December 8, 2025 at 11:00:40 (UTC) |
| Distance from |
San Ramon, CA - 4 km (3 miles) SE (132 degrees) Dublin, CA - 6 km (4 miles) N (354 degrees) Blackhawk, CA - 8 km (5 miles) SSW (203 degrees) Diablo, CA - 9 km (6 miles) S (172 degrees) Danville, CA - 9 km (6 miles) SE (146 degrees) |
| Coordinates | 37 deg. 45.3 min. N (37.756N), 121 deg. 56.6 min. W (121.943W) |
| Depth | 7.78 km (4.80 miles) |
| Quality | Excellent |
| Location Quality Parameters | Nst=37, Nph=35, Dmin=3.6 km, Rmss=0.09 sec, Erho=0.16 km, Erzz=0.5 km, Gp=37 degrees |
| Event ID# | nc75276381 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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