California earthquakes

M1.6 earthquake 8km SW of Beaumont, CA

A magnitude 1.6 earthquake struck 8km SW of Beaumont, CA on Sun, Dec 20, 1981, 1:32 PM PST (21:32 UTC), 14 km (9 mi) below the surface.

A larger quake followed: M2.0 3km NE of Colton, CA. 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
1.6 (mc), micro
Local time
UTC
1981-12-20 21:32:25 UTC
Depth
14.2 km (8.8 mi), shallow
Epicenter
33.885° N, 117.046° 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 0.3 km horizontally, 0.5 km in depth
Depth from
From location
Station coverage gap
69°
Stations used
30

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 150 in the 60 days after this one and 0 in the 30 days before it.

After

The first 60 of 150.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event ci103675. Read Tue, Sep 22, 2026, 10:57 AM UTC.