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 7:49:07 AM (PST) on Saturday, December 20, 2025.
The magnitude 1.7 event occurred 4 km (3 miles) SE of San Ramon, CA.
The hypocentral depth is 8 km ( 5 miles).
| Magnitude | 1.7 - duration magnitude (Md) |
| Time | Saturday, December 20, 2025 at 7:49:07 AM (PST) Saturday, December 20, 2025 at 15:49:07 (UTC) |
| Distance from |
San Ramon, CA - 4 km (3 miles) SE (136 degrees) Dublin, CA - 5 km (3 miles) N (353 degrees) Blackhawk, CA - 8 km (5 miles) SSW (202 degrees) Diablo, CA - 9 km (6 miles) S (172 degrees) Danville, CA - 9 km (6 miles) SSE (148 degrees) |
| Coordinates | 37 deg. 45.1 min. N (37.751N), 121 deg. 56.6 min. W (121.943W) |
| Depth | 7.80 km (4.80 miles) |
| Quality | Good |
| Location Quality Parameters | Nst=12, Nph=12, Dmin=10.8 km, Rmss=0.10 sec, Erho=0.37 km, Erzz=0.790000021 km, Gp=101 degrees |
| Event ID# | nc75283446 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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