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 7:54:29 PM (PST) on Friday, December 19, 2025.
The magnitude 1.9 event occurred 4 km (2 miles) SE of San Ramon, CA.
The hypocentral depth is 7 km ( 4 miles).
| Magnitude | 1.9 - duration magnitude (Md) |
| Time | Friday, December 19, 2025 at 7:54:29 PM (PST) Saturday, December 20, 2025 at 3:54:29 (UTC) |
| Distance from |
San Ramon, CA - 4 km (2 miles) SE (125 degrees) Dublin, CA - 7 km (4 miles) N (353 degrees) Blackhawk, CA - 7 km (5 miles) SSW (207 degrees) Diablo, CA - 8 km (5 miles) S (172 degrees) Danville, CA - 8 km (5 miles) SE (144 degrees) |
| Coordinates | 37 deg. 45.7 min. N (37.762N), 121 deg. 56.7 min. W (121.946W) |
| Depth | 6.62 km (4.10 miles) |
| Quality | Good |
| Location Quality Parameters | Nst=18, Nph=17, Dmin=10.8 km, Rmss=0.11 sec, Erho=0.38 km, Erzz=0.839999974 km, Gp=132 degrees |
| Event ID# | nc75283026 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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