Recent Earthquakes in California and Nevada
== PRELIMINARY EARTHQUAKE 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 earthquake occurred at 1:41:47 PM (PDT) on Sunday, August 10, 2025.
The magnitude 0.5 event occurred 7 km (4 miles) S of Portola Valley, CA.
The hypocentral depth is 11 km ( 7 miles).
| Magnitude | 0.5 - duration magnitude (Md) |
| Time | Sunday, August 10, 2025 at 1:41:47 PM (PDT) Sunday, August 10, 2025 at 20:41:47 (UTC) |
| Distance from |
Portola Valley, CA - 7 km (4 miles) S (170 degrees) Los Altos Hills, CA - 10 km (6 miles) SW (231 degrees) Loyola, CA - 11 km (7 miles) WSW (255 degrees) Woodside, CA - 12 km (7 miles) SSE (167 degrees) Los Altos, CA - 12 km (7 miles) SW (235 degrees) |
| Coordinates | 37 deg. 19.5 min. N (37.325N), 122 deg. 13.3 min. W (122.222W) |
| Depth | 10.60 km (6.60 miles) |
| Quality | Good |
| Location Quality Parameters | Nst=12, Nph=15, Dmin=4.6 km, Rmss=0.07 sec, Erho=0.41 km, Erzz=0.49 km, Gp=117 degrees |
| Event ID# | nc75221502 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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