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 5:36:11 AM (PST) on Monday, December 8, 2025.
The magnitude 2.1 event occurred 4 km (3 miles) SE of San Ramon, CA.
The hypocentral depth is 8 km ( 5 miles).
| Magnitude | 2.1 - duration magnitude (Md) |
| Time | Monday, December 8, 2025 at 5:36:11 AM (PST) Monday, December 8, 2025 at 13:36:11 (UTC) |
| Distance from |
San Ramon, CA - 4 km (3 miles) SE (132 degrees) Dublin, CA - 6 km (4 miles) N (356 degrees) Blackhawk, CA - 8 km (5 miles) SSW (201 degrees) Diablo, CA - 9 km (6 miles) S (170 degrees) Danville, CA - 9 km (6 miles) SE (145 degrees) |
| Coordinates | 37 deg. 45.2 min. N (37.753N), 121 deg. 56.4 min. W (121.940W) |
| Depth | 8.08 km (5.00 miles) |
| Quality | Good |
| Location Quality Parameters | Nst=20, Nph=20, Dmin=11.1 km, Rmss=0.07 sec, Erho=0.28 km, Erzz=0.610000014 km, Gp=46 degrees |
| Event ID# | nc75276556 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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