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 4:07:43 PM (PST) on Monday, December 8, 2025.
The magnitude 1.7 event occurred 5 km (3 miles) ESE of San Ramon, CA.
The hypocentral depth is 7 km ( 4 miles).
| Magnitude | 1.7 - duration magnitude (Md) |
| Time | Monday, December 8, 2025 at 4:07:43 PM (PST) Tuesday, December 9, 2025 at 0:07:43 (UTC) |
| Distance from |
San Ramon, CA - 5 km (3 miles) ESE (120 degrees) Dublin, CA - 6 km (4 miles) N (2 degrees) Blackhawk, CA - 7 km (4 miles) SSW (198 degrees) Diablo, CA - 9 km (5 miles) SSE (166 degrees) Danville, CA - 9 km (6 miles) SE (140 degrees) |
| Coordinates | 37 deg. 45.6 min. N (37.760N), 121 deg. 56.0 min. W (121.934W) |
| Depth | 6.51 km (4.00 miles) |
| Quality | Good |
| Location Quality Parameters | Nst=7, Nph=7, Dmin=11.8 km, Rmss=0.04 sec, Erho=0.32 km, Erzz=1.10000002 km, Gp=109 degrees |
| Event ID# | nc75276956 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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