California earthquakes

M3.8 earthquake 0 km N of Round Valley, California

A magnitude 3.8 earthquake struck 0 km N of Round Valley, California on Mon, Dec 17, 1984, 1:17 PM PST (21:17 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M5.2 31 km ENE of Mono City, 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: 3.8 (ml), minor
Local time: Mon, Dec 17, 1984, 1:17 PM PST
UTC: 1984-12-17 21:17:23 UTC
Depth: 5.9 km (3.6 mi), shallow
Epicenter: 37.425° N, 118.587° 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 0.2 km horizontally, 0.7 km in depth
Depth from: From location
Station coverage gap: 69°
Stations used: 48

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 200 in the 60 days after this one and 0 in the 30 days before it.

After

The first 60 of 200.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc34621 (also filed as ci56930, usp0002a5g). Read Tue, Sep 22, 2026, 8:02 AM UTC.