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 9:33:11 AM (PST) on Monday, December 8, 2025.
The magnitude 1.8 event occurred 4 km (2 miles) SE of San Ramon, CA.
The hypocentral depth is 6 km ( 4 miles).
| Magnitude | 1.8 - duration magnitude (Md) |
| Time | Monday, December 8, 2025 at 9:33:11 AM (PST) Monday, December 8, 2025 at 17:33:11 (UTC) |
| Distance from |
San Ramon, CA - 4 km (2 miles) SE (125 degrees) Dublin, CA - 6 km (4 miles) N (355 degrees) Blackhawk, CA - 7 km (5 miles) SSW (204 degrees) Diablo, CA - 8 km (5 miles) S (170 degrees) Danville, CA - 9 km (5 miles) SE (143 degrees) |
| Coordinates | 37 deg. 45.6 min. N (37.760N), 121 deg. 56.5 min. W (121.942W) |
| Depth | 6.47 km (4.00 miles) |
| Quality | Good |
| Location Quality Parameters | Nst=10, Nph=10, Dmin=11.1 km, Rmss=0.10 sec, Erho=0.42 km, Erzz=1.33000004 km, Gp=108 degrees |
| Event ID# | nc75276681 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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