California earthquakes

M3.3 earthquake 38 km SSW of Round Valley, California

A magnitude 3.3 earthquake struck 38 km SSW of Round Valley, California on Thu, Apr 1, 1982, 1:26 AM PST (09:26 UTC), 22 km (14 mi) below the surface.

A larger quake followed: M3.6 7 km NNW of Big Pine, 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: Thu, Apr 1, 1982, 1:26 AM PST
UTC: 1982-04-01 09:26:39 UTC
Depth: 21.9 km (13.6 mi), shallow
Epicenter: 37.123° N, 118.804° 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 10.1 km horizontally, 3.6 km in depth
Magnitude uncertainty: ±0.08
Depth from: From location
Station coverage gap: 320°, poorly surrounded by stations
Stations used: 8

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 87 in the 60 days after this one and 27 in the 30 days before it.

After

The first 60 of 87.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1073393 (also filed as ci528029). Read Tue, Sep 22, 2026, 11:17 AM UTC.