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 3:08:33 AM (PDT) on Tuesday, August 18, 2026.
The magnitude 1.1 event occurred 3 km (2 miles) NNE (18 degrees) of Portola Valley, CA.
The hypocentral depth is 3 km ( 2 miles).
| Magnitude | 1.1 - duration magnitude (Md) |
| Time | Tuesday, August 18, 2026 at 3:08:33 AM (PDT) Tuesday, August 18, 2026 at 10:08:33 (UTC) |
| Distance from |
Portola Valley, CA - 3 km (2 miles) NNE (18 degrees) Woodside, CA - 4 km (2 miles) SE (135 degrees) West Menlo Park, CA - 4 km (2 miles) SW (215 degrees) Stanford, CA - 6 km (3 miles) WSW (251 degrees) Atherton, CA - 6 km (4 miles) SSW (202 degrees) |
| Coordinates | 37 deg. 24.4 min. N (37.407N), 122 deg. 13.5 min. W (122.226W) |
| Depth | 3.41 km (2.10 miles) |
| Quality | Fair |
| Location Quality Parameters | Nst=7, Nph=7, Dmin=1.4 km, Rmss=0.03 sec, Erho=0.85 km, Erzz=0.569999993 km, Gp=203 degrees |
| Event ID# | nc75420537 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
[
Index map ||
Big earthquake list ||
All earthquake list ||
Glossary of terms ||
Top page
]
[
Did you feel it? ||
ShakeMaps
|| Relative2Me
]
[ Data Sources ]
Special maps
Long Valley || Los Angeles || San Francisco
Data Sources
US and World - USGS/NEIC = National Earthquake Information Center
Northern California - UCB = University of California, Berkeley
Southern California - Caltech = California Institute of Technology
Nevada - UNR = University of Nevada, Reno
Offshore = West Coast & Alaska Tsunami Warning Center
...all members of the Advanced National Seismic System (ANSS)
