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 3:45:33 AM (PST) on Monday, December 8, 2025.
The magnitude 1.6 event occurred 4 km (3 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 3:45:33 AM (PST) Monday, December 8, 2025 at 11:45:33 (UTC) |
| Distance from |
San Ramon, CA - 4 km (3 miles) SE (127 degrees) Dublin, CA - 6 km (4 miles) N (358 degrees) Blackhawk, CA - 8 km (5 miles) SSW (201 degrees) Diablo, CA - 9 km (6 miles) S (169 degrees) Danville, CA - 9 km (6 miles) SE (143 degrees) |
| Coordinates | 37 deg. 45.4 min. N (37.756N), 121 deg. 56.3 min. W (121.939W) |
| Depth | 6.71 km (4.20 miles) |
| Quality | Good |
| Location Quality Parameters | Nst=8, Nph=8, Dmin=11.3 km, Rmss=0.04 sec, Erho=0.31 km, Erzz=1.48000002 km, Gp=112 degrees |
| Event ID# | nc75276416 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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