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 5:27:32 AM (PST) on Monday, December 8, 2025.
The magnitude 1.6 event occurred 3 km (2 miles) ESE of San Ramon, CA.
The hypocentral depth is 4 km ( 2 miles).
| Magnitude | 1.6 - duration magnitude (Md) |
| Time | Monday, December 8, 2025 at 5:27:32 AM (PST) Monday, December 8, 2025 at 13:27:32 (UTC) |
| Distance from |
San Ramon, CA - 3 km (2 miles) ESE (123 degrees) Dublin, CA - 7 km (4 miles) N (351 degrees) Blackhawk, CA - 7 km (4 miles) SSW (210 degrees) Diablo, CA - 8 km (5 miles) S (174 degrees) Danville, CA - 8 km (5 miles) SE (144 degrees) |
| Coordinates | 37 deg. 45.9 min. N (37.765N), 121 deg. 56.9 min. W (121.949W) |
| Depth | 3.70 km (2.30 miles) |
| Quality | Fair |
| Location Quality Parameters | Nst=7, Nph=7, Dmin=10.7 km, Rmss=0.13 sec, Erho=0.78 km, Erzz=2.95000005 km, Gp=186 degrees |
| Event ID# | nc75276536 |
| 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)
