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 2:23:38 AM (PST) on Tuesday, December 9, 2025.
The magnitude 1.4 event occurred 4 km (2 miles) SE of San Ramon, CA.
The hypocentral depth is 6 km ( 4 miles).
| Magnitude | 1.4 - duration magnitude (Md) |
| Time | Tuesday, December 9, 2025 at 2:23:38 AM (PST) Tuesday, December 9, 2025 at 10:23:38 (UTC) |
| Distance from |
San Ramon, CA - 4 km (2 miles) SE (128 degrees) Dublin, CA - 6 km (4 miles) N (353 degrees) Diablo, CA - 8 km (5 miles) S (172 degrees) Danville, CA - 8 km (5 miles) SE (145 degrees) Blackhawk, CA - 8 km (5 miles) SSW (205 degrees) |
| Coordinates | 37 deg. 45.6 min. N (37.759N), 121 deg. 56.7 min. W (121.945W) |
| Depth | 6.29 km (3.90 miles) |
| Quality | Good |
| Location Quality Parameters | Nst=9, Nph=9, Dmin=10.9 km, Rmss=0.10 sec, Erho=0.78 km, Erzz=1.37 km, Gp=111 degrees |
| Event ID# | nc75277266 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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