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 3:15:05 AM (PST) on Saturday, December 20, 2025.
The magnitude 1.6 event occurred 4 km (2 miles) SE of San Ramon, CA.
The hypocentral depth is 8 km ( 5 miles).
| Magnitude | 1.6 - duration magnitude (Md) |
| Time | Saturday, December 20, 2025 at 3:15:05 AM (PST) Saturday, December 20, 2025 at 11:15:05 (UTC) |
| Distance from |
San Ramon, CA - 4 km (2 miles) SE (140 degrees) Dublin, CA - 6 km (4 miles) N (349 degrees) Blackhawk, CA - 8 km (5 miles) SSW (205 degrees) Diablo, CA - 9 km (6 miles) S (175 degrees) Danville, CA - 9 km (6 miles) SSE (150 degrees) |
| Coordinates | 37 deg. 45.2 min. N (37.753N), 121 deg. 56.9 min. W (121.949W) |
| Depth | 7.73 km (4.80 miles) |
| Quality | Fair |
| Location Quality Parameters | Nst=8, Nph=8, Dmin=10.4 km, Rmss=0.04 sec, Erho=0.59 km, Erzz=1.14999998 km, Gp=205 degrees |
| Event ID# | nc75283301 |
| 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)
