California earthquakes

M3.1 earthquake 33 km WNW of Samoa, California

A magnitude 3.1 earthquake struck 33 km WNW of Samoa, California on Sat, Dec 13, 1980, 3:11 PM PST (23:11 UTC), 20 km (13 mi) below the surface.

A larger quake followed: M3.4 3 km SW of Burnt Ranch, 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
3.1 (md), minor
Local time
UTC
1980-12-13 23:11:43 UTC
Depth
20.4 km (12.7 mi), shallow
Epicenter
40.945° N, 124.543° W
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 4.1 km horizontally, 1.4 km in depth
Depth from
From location
Station coverage gap
279°, 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: 192 in the 60 days after this one and 7 in the 30 days before it.

After

The first 60 of 192.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1058106. Read Tue, Sep 22, 2026, 9:18 AM UTC.