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 4:10:51 PM (PST) on Monday, December 8, 2025.
The magnitude 1.3 event occurred 4 km (3 miles) ESE of San Ramon, CA.
The hypocentral depth is 6 km ( 4 miles).
| Magnitude | 1.3 - duration magnitude (Md) |
| Time | Monday, December 8, 2025 at 4:10:51 PM (PST) Tuesday, December 9, 2025 at 0:10:51 (UTC) |
| Distance from |
San Ramon, CA - 4 km (3 miles) ESE (122 degrees) Dublin, CA - 6 km (4 miles) N (1 degrees) Blackhawk, CA - 7 km (5 miles) SSW (199 degrees) Diablo, CA - 9 km (5 miles) SSE (167 degrees) Danville, CA - 9 km (6 miles) SE (141 degrees) |
| Coordinates | 37 deg. 45.5 min. N (37.758N), 121 deg. 56.1 min. W (121.935W) |
| Depth | 6.16 km (3.80 miles) |
| Quality | Fair |
| Location Quality Parameters | Nst=5, Nph=5, Dmin=11.7 km, Rmss=0.02 sec, Erho=0.64 km, Erzz=2.68000007 km, Gp=109 degrees |
| Event ID# | nc75276961 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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