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 8:02:36 PM (PST) on Friday, December 19, 2025.
The magnitude 1.0 event occurred 4 km (2 miles) SE of San Ramon, CA.
The hypocentral depth is 8 km ( 5 miles).
| Magnitude | 1.0 - duration magnitude (Md) |
| Time | Friday, December 19, 2025 at 8:02:36 PM (PST) Saturday, December 20, 2025 at 4:02:36 (UTC) |
| Distance from |
San Ramon, CA - 4 km (2 miles) SE (134 degrees) Dublin, CA - 6 km (4 miles) N (351 degrees) Blackhawk, CA - 8 km (5 miles) SSW (205 degrees) Danville, CA - 9 km (5 miles) SSE (147 degrees) Diablo, CA - 9 km (6 miles) S (173 degrees) |
| Coordinates | 37 deg. 45.3 min. N (37.755N), 121 deg. 56.8 min. W (121.946W) |
| Depth | 8.02 km (5.00 miles) |
| Quality | Good |
| Location Quality Parameters | Nst=14, Nph=14, Dmin=10.6 km, Rmss=0.13 sec, Erho=0.38 km, Erzz=1.63 km, Gp=54 degrees |
| Event ID# | nc75283056 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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