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 8:52:35 PM (PST) on Friday, December 19, 2025.
The magnitude 1.7 event occurred 4 km (2 miles) SE of San Ramon, CA.
The hypocentral depth is 7 km ( 4 miles).
| Magnitude | 1.7 - duration magnitude (Md) |
| Time | Friday, December 19, 2025 at 8:52:35 PM (PST) Saturday, December 20, 2025 at 4:52:35 (UTC) |
| Distance from |
San Ramon, CA - 4 km (2 miles) SE (139 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 (149 degrees) |
| Coordinates | 37 deg. 45.2 min. N (37.753N), 121 deg. 56.9 min. W (121.948W) |
| Depth | 7.25 km (4.50 miles) |
| Quality | Good |
| Location Quality Parameters | Nst=17, Nph=17, Dmin=10.4 km, Rmss=0.08 sec, Erho=0.28 km, Erzz=0.660000026 km, Gp=62 degrees |
| Event ID# | nc75283156 |
| 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)
