California earthquakes

M1.8 earthquake 14 km S of Round Mountain, California

A magnitude 1.8 earthquake struck 14 km S of Round Mountain, California on Mon, Mar 29, 1982, 5:31 AM PST (13:31 UTC), 3 km (2 mi) below the surface.

A larger quake followed: M2.4 5 km NNW of Chester, 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
1.8 (md), micro
Local time
UTC
1982-03-29 13:31:57 UTC
Depth
3.2 km (2.0 mi), shallow
Epicenter
40.663° N, 121.959° W
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 7.2 km horizontally, 30.6 km in depth
Magnitude uncertainty
±0.31
Depth from
From location
Station coverage gap
327°, poorly surrounded by stations
Stations used
5

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 50 in the 60 days after this one and 12 in the 30 days before it.

After

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1073337. Read Tue, Sep 22, 2026, 10:23 PM UTC.