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 5:37:12 AM (PST) on Saturday, December 20, 2025.
The magnitude 1.3 event occurred 4 km (3 miles) SE of San Ramon, CA.
The hypocentral depth is 8 km ( 5 miles).
| Magnitude | 1.3 - duration magnitude (Md) |
| Time | Saturday, December 20, 2025 at 5:37:12 AM (PST) Saturday, December 20, 2025 at 13:37:12 (UTC) |
| Distance from |
San Ramon, CA - 4 km (3 miles) SE (139 degrees) Dublin, CA - 6 km (4 miles) N (349 degrees) Blackhawk, CA - 8 km (5 miles) SSW (205 degrees) Diablo, CA - 9 km (6 miles) S (175 degrees) Danville, CA - 9 km (6 miles) SSE (149 degrees) |
| Coordinates | 37 deg. 45.1 min. N (37.752N), 121 deg. 56.9 min. W (121.948W) |
| Depth | 7.80 km (4.80 miles) |
| Quality | Fair |
| Location Quality Parameters | Nst=8, Nph=8, Dmin=10.4 km, Rmss=0.04 sec, Erho=0.66 km, Erzz=1.21000004 km, Gp=205 degrees |
| Event ID# | nc75283396 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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