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 4:52:18 PM (PST) on Sunday, December 28, 2025.
The magnitude 2.2 event occurred 4 km (3 miles) SE of San Ramon, CA.
The hypocentral depth is 7 km ( 5 miles).
| Magnitude | 2.2 - duration magnitude (Md) |
| Time | Sunday, December 28, 2025 at 4:52:18 PM (PST) Monday, December 29, 2025 at 0:52:18 (UTC) |
| Distance from |
San Ramon, CA - 4 km (3 miles) SE (144 degrees) Dublin, CA - 5 km (3 miles) NNW (347 degrees) Blackhawk, CA - 9 km (5 miles) SSW (205 degrees) Danville, CA - 9 km (6 miles) SSE (151 degrees) Diablo, CA - 10 km (6 miles) S (175 degrees) |
| Coordinates | 37 deg. 44.9 min. N (37.749N), 121 deg. 56.9 min. W (121.949W) |
| Depth | 7.46 km (4.60 miles) |
| Quality | Fair |
| Location Quality Parameters | Nst=6, Nph=6, Dmin=10.3 km, Rmss=0.01 sec, Erho=1.85 km, Erzz=1.03999996 km, Gp=225 degrees |
| Event ID# | nc75287871 |
| 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)
