California earthquakes

M2.4 earthquake 6 km SSW of Swall Meadows, California

A magnitude 2.4 earthquake struck 6 km SSW of Swall Meadows, California on Thu, Dec 27, 1984, 3:11 AM PST (11:11 UTC), -1 km (0 mi) below the surface.

A larger quake followed: M2.6 4 km N of Round Valley, 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: 2.4 (md), micro
Local time: Thu, Dec 27, 1984, 3:11 AM PST
UTC: 1984-12-27 11:11:53 UTC
Depth: -0.6 km (-0.3 mi), shallow
Epicenter: 37.453° N, 118.678° 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
Magnitude uncertainty: ±0.18
Depth from: From location
Station coverage gap: 72°
Stations used: 41

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 nc37726 (also filed as ci57499). Read Tue, Sep 22, 2026, 9:05 AM UTC.