California earthquakes

M2.1 earthquake 8 km ENE of Trinity Village, California

A magnitude 2.1 earthquake struck 8 km ENE of Trinity Village, California on Mon, Feb 11, 1985, 7:11 PM PST (03:11 UTC), 18 km (11 mi) below the surface.

A larger quake followed: M2.3 26 km S of Ruth, 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: 2.1 (md), micro
Local time: Mon, Feb 11, 1985, 7:11 PM PST
UTC: 1985-02-12 03:11:34 UTC
Depth: 17.9 km (11.1 mi), shallow
Epicenter: 40.916° N, 123.438° 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, 0.8 km in depth
Magnitude uncertainty: ±0.31
Depth from: From location
Station coverage gap: 74°
Stations used: 9

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 34 in the 60 days after this one and 14 in the 30 days before it.

After

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc43201. Read Tue, Sep 22, 2026, 11:18 AM UTC.