Recent Earthquakes in California and Nevada
== PRELIMINARY EVENT REPORT ==
U.S. Geological Survey, Menlo Park, California
U.C. Berkeley Seismological Laboratory, Berkeley, California
Version #3: This report supersedes any earlier reports of this event. This event has been reviewed by a seismologist.
A micro quarry occurred at 2:55:07 PM (PDT) on Tuesday, July 22, 2025.
The magnitude 1.2 event (a probable quarry explosion) occurred 6 km (4 miles) S of Portola Valley, CA.
The hypocentral depth is -0.33 km (-0.20 miles).
| Magnitude | 1.2 - duration magnitude (Md) |
| Time | Tuesday, July 22, 2025 at 2:55:07 PM (PDT) Tuesday, July 22, 2025 at 21:55:07 (UTC) |
| Distance from |
Portola Valley, CA - 6 km (4 miles) S (178 degrees) Los Altos Hills, CA - 10 km (6 miles) WSW (238 degrees) Woodside, CA - 11 km (7 miles) S (171 degrees) West Menlo Park, CA - 12 km (7 miles) SSW (194 degrees) Stanford, CA - 12 km (7 miles) SSW (210 degrees) |
| Coordinates | 37 deg. 20.0 min. N (37.333N), 122 deg. 14.0 min. W (122.234W) |
| Depth | -0.33 km (-0.20 miles) |
| Quality | Good |
| Location Quality Parameters | Nst=9, Nph=9, Dmin=5.0 km, Rmss=0.04 sec, Erho=0.32 km, Erzz=31.61 km, Gp=63 degrees |
| Event ID# | nc75213682 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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