California earthquakes

M1.8 earthquake 21 km SSW of Three Rocks, California

A magnitude 1.8 earthquake struck 21 km SSW of Three Rocks, California on Fri, Nov 12, 1982, 11:20 PM PST (07:20 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M3.7 16 km ESE of Tres Pinos, 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: Fri, Nov 12, 1982, 11:20 PM PST
UTC: 1982-11-13 07:20:50 UTC
Depth: 10.4 km (6.4 mi), shallow
Epicenter: 36.328° N, 120.499° 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 0.4 km horizontally, 0.6 km in depth
Magnitude uncertainty: ±0.19
Depth from: From location
Station coverage gap: 193°, poorly surrounded by stations
Stations used: 27

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 129 in the 60 days after this one and 155 in the 30 days before it.

After

The first 60 of 129.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1081813. Read Thu, Sep 24, 2026, 11:24 AM UTC.