USGS · September 27, 2026
Magnitude 3.5 earthquake near Patterson, California
A magnitude 3.5 earthquake was recorded near 27 km WSW of Westley, CA on Sep 27, 2026, 07:21 AM (local time at the epicentre — PDT, UTC-7), at a depth of about 2.4 km, according to USGS.
USGSFelt by 13 people · community intensity II (weak)Shaking IVShallow (0–70 km)Reviewed by a seismologist
Updated 2026-09-27 17:35 UTC
The full record
- Magnitude
- M 3.5 · local (Richter) magnitude
- Location
- 27 km WSW of Westley, CA
- Local time at the epicentre
- Sep 27, 2026, 07:21 AM — PDT, UTC-7
- Time (UTC)
- 2026-09-27 14:21 UTC
- Depth
- 2.4 km · Shallow (0–70 km)
- Coordinates
- 37.418, -121.455
- Felt reports
- Felt by 13 people · community intensity II (weak)
- Estimated shaking
- IV · Light
- Tsunami
- No tsunami evaluation was flagged for this earthquake.
- Significance
- 186 / 1000 · routine event
- Solution quality
- 81 seismic stations used · 69° azimuthal gap (well-constrained epicentre)
- Review status
- Reviewed by a seismologist
- Catalog
- USGS
Epicentre and nearby recent earthquakes
The highlighted circle is this earthquake. Smaller circles are other events recorded nearby in the last 30 days.
What the shaking was like
Shallow earthquakes release their energy close to the surface, so they are felt more strongly nearby than a deeper earthquake of the same magnitude.
Estimated instrumental shaking IV (Light): Felt indoors by many; dishes and windows rattle and parked cars rock.
People who reported it described intensity II (Weak): Felt by a few people at rest, mostly on upper floors.
Felt it yourself? USGS collects first-hand reports through “Did You Feel It?”, and those reports are what produce the community intensity above.
Who lives nearby
About 21,498 people live in towns within 30 km of the epicentre, and 8,394,235 within 100 km. Distances are from the epicentre to the town centre.
| Place | Distance | Population |
|---|---|---|
| Patterson | 29.4 km ENE | 21,498 |
| East Foothills | 32.2 km W | 8,269 |
| Alum Rock | 33.3 km W | 15,536 |
| Tracy | 35.9 km N | 87,075 |
| Morgan Hill | 36.5 km SSW | 42,948 |
| Seven Trees | 36.9 km WSW | 1,788 |
| Communications Hill | 38.1 km WSW | 11,267 |
| San Martin | 39.5 km SSW | 7,027 |
| San Jose | 39.8 km WSW | 997,368 |
| Milpitas | 39.9 km W | 77,604 |
Earthquake history in this area
12 earthquakes of magnitude 4.5+ have been recorded within 200 km of this epicentre since 1960, in California.
Other earthquakes near this epicentre
8 other events within 100 km in the last 30 days.
Be first to know about the next earthquake near 27 km WSW of Westley, CA
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Frequently asked questions
How strong was the 27 km WSW of Westley, CA earthquake?
Magnitude 3.5 (local (Richter) magnitude), at a depth of 2.4 km. Shallow earthquakes release their energy close to the surface, so they are felt more strongly nearby than a deeper earthquake of the same magnitude.
Exactly when did it happen?
Sep 27, 2026, 07:21 AM (local time at the epicentre — PDT, UTC-7). In universal time: 2026-09-27 14:21 UTC.
Was it felt?
Felt by 13 people · community intensity II (weak). Felt indoors by many; dishes and windows rattle and parked cars rock.
Was there a tsunami warning?
No tsunami evaluation was flagged for this earthquake.
Which towns are closest to the epicentre?
The closest is Patterson, 29.4 km ENE (population 21,498).
Are earthquakes normal in this area?
Yes. The largest earthquake recorded within 200 km since 1960 was magnitude 6.9 (The 1989 Loma Prieta, California Earthquake, 1989), and 8 further events were recorded within 100 km in the last 30 days.
How do I get alerts for the next earthquake here?
Install the free SeismoWatch Android app, draw a box over this area, set a minimum magnitude, and turn alerts on.
About this page
Event data: U.S. Geological Survey (USGS), the European-Mediterranean Seismological Centre (EMSC), in Venezuela FUNVISIS and in Brazil the RSBR through the Centro de Sismologia da USP. Populated places and time zones: GeoNames (CC BY 4.0). Preliminary solutions are revised as more observations arrive.