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M 3.5 Earthquake 27 km WSW of Westley, CA

Source: USGS · Northern California

A magnitude 3.5 earthquake was recorded by USGS near 27 km WSW of Westley. On the USGS Earthquake Hazards Program scale, M3.5 is classified "Minor". Among the 1,838 earthquake reports Areazine has published, this M3.5 event ranks stronger than 32% of them (rank #1,179 by magnitude).

30 seconds on this earthquake report

Magnitude
M 3.5
USGS class
Minor
Location
27 km WSW of Westley
Archive rank
#1,179 of 1,838
Source
USGS
Published
September 27, 2026
MINOR

Sits above 32% of the 1,838 earthquakes in the archive by magnitude; 1,178 ran stronger.

Record status: a point-in-time USGS detection. Aftershocks, revised magnitude, and felt-report data continue to update on USGS's own event page after publication.

What Happened

A M 3.45 ml earthquake struck 27 km WSW of Westley, CA on 2026-10-26 at 12:21:50 UTC (1790518910350 ms). The event had a shallow depth of 2.41 km.

Location Details

The epicenter was located at latitude 37.417667388916, longitude -121.455497741699. This shallow depth (<20 km) places the event in the upper crust.

Impact Assessment

The earthquake was felt by 5 people, with a maximum reported intensity (CDI) of 2.4 and MMI of 3.612. No tsunami was generated (tsunami: 0) and no alert level was issued.

What You Should Know

Earthquakes of this magnitude (M 2.5-3.9) are often felt but rarely cause damage. Minor aftershocks remain possible.

Source

https://earthquake.usgs.gov/earthquakes/eventpage/nc75443097 (USGS)

Original source: USGS Official Notice ↗

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Nationwide notices with similar length or severity timing 8

Beyond this USGS earthquake report's own category, Areazine surfaces two nationwide peer sets: length-matched and severity/date-matched notices from elsewhere in the archive, distinct from the same-feed Related list above.

Similar body length

Nearest notices by article body length (747 characters here).

Yellow Severe Thunderstorm Warning in Effect for Lacombe County 747 chars Yellow Storm Surge Warning for Tuktoyaktuk Coastline (Sep 14, 2026) 747 chars Yellow Warning: Severe Thunderstorm in Effect for R.M. of Morris 747 chars Yellow Warning - Severe Thunderstorm in Effect for R.M. of Spiritwood 747 chars

Similar severity timing

Same severity (low) notices issued closest in time to September 27, 2026.

Flood Alert for Essex Coast from Clacton to St Peters Flat (Sep 27, 2026) low MVA Alert for M7 (Westlink Mtwy), Oakhurst low Yellow Rainfall Warning for Uranium City - Camsell Portage low M 2.7 ml Earthquake Reported in Wales, United Kingdom low

What People Ask

Common questions about this USGS earthquake report.

What was the magnitude of this event? ▾
A magnitude 3.45 ml earthquake occurred 27 km WSW of Westley, CA at a shallow depth of 2.4 km.
What does a magnitude 3.5 ("Minor") earthquake mean? ▾
The USGS classifies M3.5 as "Minor" on its Earthquake Hazards Program scale. Events in this range are rarely felt beyond the immediate epicenter and typically cause no damage; most are recorded only by seismographs.
Is this earthquake stronger or weaker than others in the archive? ▾
This is the #1,179 strongest of the 1,838 earthquake reports in Areazine's archive by magnitude, stronger than 32% of them and weaker than 1,178 others.
Was Westley likely to feel this earthquake? ▾
This event was centered 27 km WSW of Westley. Shaking intensity falls off sharply with distance from the epicenter and depends on depth and local geology, so check the USGS "Did You Feel It?" report for this event for real felt-shaking data rather than assuming from magnitude and distance alone.

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