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 9:00:53 PM (PST) on Sunday, December 28, 2025.
The magnitude 1.9 event occurred 4 km (3 miles) ESE of San Ramon, CA.
The hypocentral depth is 8 km ( 5 miles).
| Magnitude | 1.9 - duration magnitude (Md) |
| Time | Sunday, December 28, 2025 at 9:00:53 PM (PST) Monday, December 29, 2025 at 5:00:53 (UTC) |
| Distance from |
San Ramon, CA - 4 km (3 miles) ESE (106 degrees) Blackhawk, CA - 6 km (4 miles) SSW (199 degrees) Dublin, CA - 7 km (5 miles) N (3 degrees) Danville, CA - 8 km (5 miles) SE (134 degrees) Diablo, CA - 8 km (5 miles) SSE (162 degrees) |
| Coordinates | 37 deg. 46.1 min. N (37.769N), 121 deg. 55.8 min. W (121.931W) |
| Depth | 7.58 km (4.70 miles) |
| Quality | Good |
| Location Quality Parameters | Nst=15, Nph=15, Dmin=11.4 km, Rmss=0.04 sec, Erho=0.22 km, Erzz=0.620000005 km, Gp=84 degrees |
| Event ID# | nc75287991 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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