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 11:43:13 AM (PST) on Monday, December 22, 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 | Monday, December 22, 2025 at 11:43:13 AM (PST) Monday, December 22, 2025 at 19:43:13 (UTC) |
| Distance from |
San Ramon, CA - 4 km (2 miles) SE (136 degrees) Dublin, CA - 6 km (4 miles) N (349 degrees) Danville, CA - 8 km (5 miles) SSE (149 degrees) Blackhawk, CA - 8 km (5 miles) SSW (207 degrees) Diablo, CA - 9 km (5 miles) S (175 degrees) |
| Coordinates | 37 deg. 45.4 min. N (37.756N), 121 deg. 57.0 min. W (121.950W) |
| Depth | 7.60 km (4.70 miles) |
| Quality | Fair |
| Location Quality Parameters | Nst=7, Nph=7, Dmin=10.4 km, Rmss=0.05 sec, Erho=0.53 km, Erzz=1.11000001 km, Gp=184 degrees |
| Event ID# | nc75284891 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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