Earthquake reference
10 km SSE of Portola Valley, CA
USGS recorded this 0.09 magnitude event near 10 km SSE of Portola Valley, CA at 2026-10-04T00:20:53.120000+00:00. The published hypocentral depth is 2.47 km and the review status is reviewed. Event parameters can be revised as additional observations are processed. Nearby airports and postal locations on this page are calculated spatial references only; they do not establish administrative jurisdiction, damage, causation or future risk. This record is not an earthquake forecast or emergency alert.
Key facts
- Magnitude
- 0.09
- Magnitude type
- md
- Occurred at
- 2026-10-04T00:20:53.120000+00:00
- Updated at
- 2026-10-15T08:48:36.880000+00:00
- Review status
- reviewed
- Event type
- earthquake
- Tsunami flag
- No
- Significance
- 0
- Network
- nc
- Latitude
- 37.2923333333333
- Longitude
- -122.212
- Depth (km)
- 2.47
- USGS event page
- https://earthquake.usgs.gov/earthquakes/eventpage/nc75443861
Upstream revision context
USGS event revision
This timeline contains versions captured by DataOfWorld; it is not a complete official revision archive.
| Updated | Status | Payload digest |
|---|---|---|
| 2026-10-15T08:48:36.880000+00:00 | reviewed | 4075b547338e |
Associated event IDs: nc75443861
Field-level provenance
Sources for this profile
Dates and licenses apply to the specific facts and series supplied by each source.
USGS Earthquake Hazards Program
- Applicable date
- 2026-10-04
- Dataset version
- 3cf1423f7d0a
- License
- United States public domain
- Attribution
- U.S. Geological Survey
DataOfWorld deterministic earthquake profile template
- Applicable date
- 2026-10-04
- Dataset version
- earthquake-profile-v1
- License
- Original DataOfWorld text
- Attribution
- DataOfWorld
Reference data can change. Verify consequential decisions against the original source.