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 7:23:41 AM (PST) on Monday, December 8, 2025.
The magnitude 1.9 event occurred 4 km (3 miles) SE of San Ramon, CA.
The hypocentral depth is 7 km ( 4 miles).
| Magnitude | 1.9 - duration magnitude (Md) |
| Time | Monday, December 8, 2025 at 7:23:41 AM (PST) Monday, December 8, 2025 at 15:23:41 (UTC) |
| Distance from |
San Ramon, CA - 4 km (3 miles) SE (135 degrees) Dublin, CA - 6 km (4 miles) N (351 degrees) Blackhawk, CA - 8 km (5 miles) SSW (204 degrees) Diablo, CA - 9 km (6 miles) S (173 degrees) Danville, CA - 9 km (6 miles) SSE (148 degrees) |
| Coordinates | 37 deg. 45.2 min. N (37.754N), 121 deg. 56.7 min. W (121.946W) |
| Depth | 6.86 km (4.30 miles) |
| Quality | Good |
| Location Quality Parameters | Nst=10, Nph=9, Dmin=10.7 km, Rmss=0.05 sec, Erho=0.29 km, Erzz=0.620000005 km, Gp=97 degrees |
| Event ID# | nc75276611 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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