California earthquakes

M3.3 earthquake 11 km W of Huron, California

A magnitude 3.3 earthquake struck 11 km W of Huron, California on Mon, Jun 20, 1983, 3:33 AM PDT (10:33 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M5.4 11 km NNW of Coalinga, California. This one was a foreshock.

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

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The earthquake

Magnitude: 3.3 (md), minor
Local time: Mon, Jun 20, 1983, 3:33 AM PDT
UTC: 1983-06-20 10:33:44 UTC
Depth: 5.9 km (3.7 mi), shallow
Epicenter: 36.218° N, 120.235° 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, 0.3 km in depth
Magnitude uncertainty: ±0.18
Depth from: From location
Station coverage gap: 71°
Stations used: 40

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 198 in the 60 days after this one and 199 in the 30 days before it.

After

The first 60 of 198.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1097201 (also filed as usp0001w7e, ci2217720). Read Sun, Sep 27, 2026, 5:55 PM UTC.