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 8:38:59 AM (PST) on Tuesday, December 30, 2025.
The magnitude 1.2 event occurred 2 km (2 miles) W of Concord, CA.
The hypocentral depth is 7 km ( 4 miles).
| Magnitude | 1.2 - duration magnitude (Md) |
| Time | Tuesday, December 30, 2025 at 8:38:59 AM (PST) Tuesday, December 30, 2025 at 16:38:59 (UTC) |
| Distance from |
Concord, CA - 2 km (2 miles) W (269 degrees) Pacheco, CA - 3 km (2 miles) ESE (122 degrees) Pleasant Hill, CA - 3 km (2 miles) NE (35 degrees) Waldon, CA - 5 km (3 miles) NNE (13 degrees) Vine Hill, CA - 6 km (4 miles) SE (135 degrees) |
| Coordinates | 37 deg. 58.0 min. N (37.967N), 122 deg. 2.6 min. W (122.043W) |
| Depth | 6.93 km (4.30 miles) |
| Quality | Fair |
| Location Quality Parameters | Nst=4, Nph=4, Dmin=11.0 km, Rmss=0.00 sec, Erho=0.75 km, Erzz=3.01999998 km, Gp=198 degrees |
| Event ID# | nc75288631 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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