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 2:09:09 AM (PDT) on Thursday, October 16, 2025.
The magnitude 1.4 event occurred 6 km (4 miles) SSE of Portola Valley, CA.
The hypocentral depth is 9 km ( 5 miles).


Magnitude 1.4 - duration magnitude (Md)
Time Thursday, October 16, 2025 at 2:09:09 AM (PDT)
Thursday, October 16, 2025 at 9:09:09 (UTC)
Distance from Portola Valley, CA - 6 km (4 miles) SSE (164 degrees)
Los Altos Hills, CA - 9 km (5 miles) SW (232 degrees)
Loyola, CA - 10 km (6 miles) WSW (257 degrees)
Stanford, CA - 11 km (7 miles) SSW (203 degrees)
Los Altos, CA - 11 km (7 miles) SW (236 degrees)
Coordinates 37 deg. 19.8 min. N (37.331N), 122 deg. 13.0 min. W (122.216W)
Depth 8.77 km (5.40 miles)
Quality Good
Location Quality Parameters Nst=11, Nph=11, Dmin=4.0 km, Rmss=0.05 sec, Erho=0.41 km, Erzz=0.610000014 km, Gp=105 degrees
Event ID# nc75250076
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For more information, see https://earthquake.usgs.gov

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