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 11:18:38 AM (PDT) on Tuesday, August 18, 2026.
The magnitude 1.5 event occurred 3 km (2 miles) NNE (18 degrees) of Portola Valley, CA.
The hypocentral depth is 4 km ( 3 miles).
| Magnitude | 1.5 - duration magnitude (Md) |
| Time | Tuesday, August 18, 2026 at 11:18:38 AM (PDT) Tuesday, August 18, 2026 at 18:18:38 (UTC) |
| Distance from |
Portola Valley, CA - 3 km (2 miles) NNE (18 degrees) Woodside, CA - 3 km (2 miles) SE (125 degrees) West Menlo Park, CA - 3 km (2 miles) SW (219 degrees) Stanford, CA - 5 km (3 miles) WSW (257 degrees) Atherton, CA - 6 km (4 miles) SSW (203 degrees) |
| Coordinates | 37 deg. 24.8 min. N (37.413N), 122 deg. 13.4 min. W (122.224W) |
| Depth | 4.44 km (2.80 miles) |
| Quality | Good |
| Location Quality Parameters | Nst=10, Nph=10, Dmin=1.9 km, Rmss=0.09 sec, Erho=0.67 km, Erzz=0.340000004 km, Gp=110 degrees |
| Event ID# | nc75420742 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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