California earthquakes

M4.0 earthquake 11 km SSE of Huron, California

A magnitude 4.0 earthquake struck 11 km SSE of Huron, California on Sun, Aug 4, 1985, 5:08 AM PDT (12:08 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M4.3 1 km WNW of Avenal, California. This one was a foreshock.

Huron forecast More in California

Map

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

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The earthquake

Magnitude: 4.0 (ml), light
Local time: Sun, Aug 4, 1985, 5:08 AM PDT
UTC: 1985-08-04 12:08:41 UTC
Depth: 10.2 km (6.3 mi), shallow
Epicenter: 36.105° N, 120.064° 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 0.3 km horizontally, 0.4 km in depth
Depth from: From location
Station coverage gap: 57°
Stations used: 106

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 68 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 nc54167 (also filed as ci108316, usp0002hc8). Read Thu, Sep 24, 2026, 11:05 AM UTC.