California earthquakes

M2.3 earthquake 2 km NNW of Plumas Eureka, California

A magnitude 2.3 earthquake struck 2 km NNW of Plumas Eureka, California on Sat, Aug 10, 1985, 4:22 PM PDT (23:22 UTC), -2 km (-1 mi) below the surface.

A larger quake followed: M3.6 5 km SSW of Canyondam, 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: 2.3 (md), micro
Local time: Sat, Aug 10, 1985, 4:22 PM PDT
UTC: 1985-08-10 23:22:32 UTC
Depth: -2.1 km (-1.3 mi), shallow
Epicenter: 39.812° N, 120.663° 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 2.2 km horizontally, 2.1 km in depth
Magnitude uncertainty: ±0.19
Depth from: From location
Station coverage gap: 234°, poorly surrounded by stations
Stations used: 10

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 41 in the 60 days after this one and 11 in the 30 days before it.

After

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc52699. Read Tue, Sep 29, 2026, 7:53 PM UTC.