California earthquakes

M3.1 earthquake 12 km SW of Huron, California

A magnitude 3.1 earthquake struck 12 km SW of Huron, California on Sat, Aug 10, 1985, 11:30 PM PDT (06:30 UTC), 9 km (5 mi) below the surface.

A larger quake followed: M4.0 11 km ENE of Coalinga, California. This one was a foreshock.

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Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude: 3.1 (ml), minor
Local time: Sat, Aug 10, 1985, 11:30 PM PDT
UTC: 1985-08-11 06:30:24 UTC
Depth: 8.7 km (5.4 mi), shallow
Epicenter: 36.120° N, 120.193° W
Region: California
Tsunami flag: No
Status: Reviewed by a seismologist

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 0.2 km horizontally, 0.4 km in depth
Depth from: From location
Station coverage gap: 97°
Stations used: 46

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.5 and up: at least 200 in the 60 days after this one and at least 200 in the 30 days before it.

After

The first 60 of at least 200.

Before

Earthquakes today California earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc52831 (also filed as ci109415, usp0002hkn). Read Thu, Sep 24, 2026, 2:10 PM UTC.