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 12:45:04 PM (PST) on Sunday, December 21, 2025.
The magnitude 1.3 event occurred 3 km (2 miles) SE of San Ramon, CA.
The hypocentral depth is 7 km ( 4 miles).
| Magnitude | 1.3 - duration magnitude (Md) |
| Time | Sunday, December 21, 2025 at 12:45:04 PM (PST) Sunday, December 21, 2025 at 20:45:04 (UTC) |
| Distance from |
San Ramon, CA - 3 km (2 miles) SE (132 degrees) Dublin, CA - 7 km (4 miles) NNW (346 degrees) Danville, CA - 7 km (5 miles) SSE (149 degrees) Diablo, CA - 8 km (5 miles) S (179 degrees) Blackhawk, CA - 8 km (5 miles) SW (214 degrees) |
| Coordinates | 37 deg. 45.8 min. N (37.764N), 121 deg. 57.4 min. W (121.956W) |
| Depth | 7.15 km (4.40 miles) |
| Quality | Fair |
| Location Quality Parameters | Nst=5, Nph=5, Dmin=10.0 km, Rmss=0.02 sec, Erho=0.99 km, Erzz=1.97000003 km, Gp=143 degrees |
| Event ID# | nc75284296 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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