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 9:10:55 AM (PST) on Monday, December 8, 2025.
The magnitude 1.6 event occurred 4 km (2 miles) SE of San Ramon, CA.
The hypocentral depth is 7 km ( 4 miles).
| Magnitude | 1.6 - duration magnitude (Md) |
| Time | Monday, December 8, 2025 at 9:10:55 AM (PST) Monday, December 8, 2025 at 17:10:55 (UTC) |
| Distance from |
San Ramon, CA - 4 km (2 miles) SE (129 degrees) Dublin, CA - 6 km (4 miles) N (354 degrees) Blackhawk, CA - 8 km (5 miles) SSW (204 degrees) Diablo, CA - 9 km (5 miles) S (171 degrees) Danville, CA - 9 km (5 miles) SE (145 degrees) |
| Coordinates | 37 deg. 45.5 min. N (37.758N), 121 deg. 56.6 min. W (121.943W) |
| Depth | 7.21 km (4.50 miles) |
| Quality | Good |
| Location Quality Parameters | Nst=7, Nph=7, Dmin=11.0 km, Rmss=0.11 sec, Erho=0.49 km, Erzz=1.30999994 km, Gp=93 degrees |
| Event ID# | nc75276671 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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