Recent Earthquakes in California and Nevada
== PRELIMINARY EARTHQUAKE REPORT ==
U.S. Geological Survey, Menlo Park, California
U.C. Berkeley Seismological Laboratory, Berkeley, California
Version #2: This report supersedes any earlier reports of this event. This event has been reviewed by a seismologist.
A micro earthquake occurred at 6:20:52 PM (PDT) on Wednesday, July 30, 2025.
The magnitude 1.6 event occurred 6 km (4 miles) SW of Clayton, CA.
The hypocentral depth is 10 km ( 6 miles).
| Magnitude | 1.6 - duration magnitude (Md) |
| Time | Wednesday, July 30, 2025 at 6:20:52 PM (PDT) Thursday, July 31, 2025 at 1:20:52 (UTC) |
| Distance from |
Clayton, CA - 6 km (4 miles) SW (221 degrees) Waldon, CA - 7 km (4 miles) ESE (113 degrees) Alamo, CA - 7 km (4 miles) NE (39 degrees) Walnut Creek, CA - 7 km (5 miles) E (95 degrees) Diablo, CA - 8 km (5 miles) NNW (345 degrees) |
| Coordinates | 37 deg. 54.0 min. N (37.901N), 121 deg. 58.8 min. W (121.980W) |
| Depth | 10.41 km (6.50 miles) |
| Quality | Excellent |
| Location Quality Parameters | Nst=37, Nph=41, Dmin=4.8 km, Rmss=0.06 sec, Erho=0.16 km, Erzz=0.27 km, Gp=69 degrees |
| Event ID# | nc75217192 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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