Recent Earthquakes in California and Nevada
== PRELIMINARY EARTHQUAKE REPORT ==
U.S. Geological Survey, Menlo Park, California
U.C. Berkeley Seismological Laboratory, Berkeley, California
Version #2: This report supersedes any earlier reports of this event. This event has been reviewed by a seismologist.
A micro earthquake occurred at 2:33:41 AM (PST) on Monday, December 8, 2025.
The magnitude 2.9 event occurred 4 km (3 miles) SE of San Ramon, CA.
The hypocentral depth is 8 km ( 5 miles).
| Magnitude | 2.9 - local magnitude (Ml) |
| Time | Monday, December 8, 2025 at 2:33:41 AM (PST) Monday, December 8, 2025 at 10:33:41 (UTC) |
| Distance from |
San Ramon, CA - 4 km (3 miles) SE (129 degrees) Dublin, CA - 6 km (4 miles) N (357 degrees) Blackhawk, CA - 8 km (5 miles) SSW (201 degrees) Diablo, CA - 9 km (6 miles) S (170 degrees) Danville, CA - 9 km (6 miles) SE (144 degrees) |
| Coordinates | 37 deg. 45.3 min. N (37.756N), 121 deg. 56.4 min. W (121.940W) |
| Depth | 8.48 km (5.30 miles) |
| Quality | Fair |
| Location Quality Parameters | Nst=70, Nph=70, Dmin=6.2 km, Rmss=0.93 sec, Erho=1.9 km, Erzz=2.01 km, Gp=26 degrees |
| Event ID# | nc75276341 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
[
Index map ||
Big earthquake list ||
All earthquake list ||
Glossary of terms ||
Top page
]
[
Did you feel it? ||
ShakeMaps
|| Relative2Me
]
[ Data Sources ]
Special maps
Long Valley || Los Angeles || San Francisco
Data Sources
US and World - USGS/NEIC = National Earthquake Information Center
Northern California - UCB = University of California, Berkeley
Southern California - Caltech = California Institute of Technology
Nevada - UNR = University of Nevada, Reno
Offshore = West Coast & Alaska Tsunami Warning Center
...all members of the Advanced National Seismic System (ANSS)
