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 9:45:38 AM (PST) on Monday, December 8, 2025.
The magnitude 1.7 event occurred 4 km (3 miles) SE of San Ramon, CA.
The hypocentral depth is 1 km ( 1 mile).
| Magnitude | 1.7 - duration magnitude (Md) |
| Time | Monday, December 8, 2025 at 9:45:38 AM (PST) Monday, December 8, 2025 at 17:45:38 (UTC) |
| Distance from |
San Ramon, CA - 4 km (3 miles) SE (124 degrees) Dublin, CA - 6 km (4 miles) N (359 degrees) Blackhawk, CA - 7 km (5 miles) SSW (201 degrees) Diablo, CA - 9 km (5 miles) SSE (168 degrees) Danville, CA - 9 km (6 miles) SE (142 degrees) |
| Coordinates | 37 deg. 45.5 min. N (37.758N), 121 deg. 56.2 min. W (121.938W) |
| Depth | 1.25 km (0.80 miles) |
| Quality | Fair |
| Location Quality Parameters | Nst=10, Nph=10, Dmin=11.5 km, Rmss=0.07 sec, Erho=0.3 km, Erzz=3.88000011 km, Gp=74 degrees |
| Event ID# | nc75276711 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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