California earthquakes

M1.8 earthquake 11km SSE of Anza, CA

A magnitude 1.8 earthquake struck 11km SSE of Anza, CA on Mon, Jan 12, 1981, 8:51 AM PST (16:51 UTC), 12 km (7 mi) below the surface.

A larger quake followed: M3.2 9km ENE of Aguanga, CA. This one was a foreshock.

Anza forecastMore in California

Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
1.8 (mh), micro
Local time
UTC
1981-01-12 16:51:08 UTC
Depth
11.6 km (7.2 mi), shallow
Epicenter
33.473° N, 116.612° 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 0.9 km horizontally, 1.9 km in depth
Magnitude uncertainty
±0.40
Depth from
From location
Station coverage gap
128°
Stations used
12

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 188 in the 60 days after this one and 0 in the 30 days before it.

After

The first 60 of 188.

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event ci12250455. Read Tue, Sep 22, 2026, 8:56 PM UTC.