California earthquakes

M1.8 earthquake 9 km NE of Trinity Village, California

A magnitude 1.8 earthquake struck 9 km NE of Trinity Village, California on Thu, Dec 9, 1982, 2:21 PM PST (22:21 UTC), 21 km (13 mi) below the surface.

A larger quake followed: M1.9 14 km WNW of Fields Landing, 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: 1.8 (md), micro
Local time: Thu, Dec 9, 1982, 2:21 PM PST
UTC: 1982-12-09 22:21:59 UTC
Depth: 20.9 km (13.0 mi), shallow
Epicenter: 40.925° N, 123.435° 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 2.6 km horizontally, 0.5 km in depth
Magnitude uncertainty: ±0.07
Depth from: From location
Station coverage gap: 273°, 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: 65 in the 60 days after this one and 28 in the 30 days before it.

After

The first 60 of 65.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1082876. Read Tue, Sep 22, 2026, 8:51 PM UTC.