Recent Earthquakes in California and Nevada
== PRELIMINARY EARTHQUAKE REPORT ==
U.S. Geological Survey, Menlo Park, California
U.C. Berkeley Seismological Laboratory, Berkeley, California
Version #4: This report supersedes any earlier reports of this event. This event has been reviewed by a seismologist.
A minor earthquake occurred at 9:28:00 PM (PDT) on Wednesday, July 30, 2025.
The magnitude 3.1 event occurred 31 km (20 miles) SW of Portola Valley, CA.
The hypocentral depth is 14 km ( 9 miles).
| Magnitude | 3.1 - local magnitude (Ml) |
| Time | Wednesday, July 30, 2025 at 9:28:00 PM (PDT) Thursday, July 31, 2025 at 4:28:00 (UTC) |
| Distance from |
Portola Valley, CA - 31 km (20 miles) SW (223 degrees) Half Moon Bay, CA - 32 km (20 miles) S (187 degrees) Boulder Creek, CA - 32 km (20 miles) W (280 degrees) Bonny Doon, CA - 32 km (20 miles) WNW (297 degrees) Woodside, CA - 34 km (21 miles) SW (215 degrees) |
| Coordinates | 37 deg. 10.5 min. N (37.176N), 122 deg. 28.5 min. W (122.475W) |
| Depth | 13.88 km (8.60 miles) |
| Quality | Poor |
| Location Quality Parameters | Nst=67, Nph=82, Dmin=34.9 km, Rmss=1.07 sec, Erho=2.13 km, Erzz=1.973 km, Gp=200 degrees |
| Event ID# | nc75217272 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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