California earthquakes

M2.1 earthquake 17 km SSE of Tres Pinos, California

A magnitude 2.1 earthquake struck 17 km SSE of Tres Pinos, California on Sun, Nov 15, 1981, 6:40 PM PST (02:40 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M2.8 17 km SSE of Tres Pinos, 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
2.1 (md), micro
Local time
UTC
1981-11-16 02:40:50 UTC
Depth
5.0 km (3.1 mi), shallow
Epicenter
36.642° N, 121.257° 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 0.1 km horizontally, 0.3 km in depth
Magnitude uncertainty
±0.20
Depth from
From location
Station coverage gap
40°
Stations used
46

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 155 in the 60 days after this one and 33 in the 30 days before it.

After

The first 60 of 155.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1069481. Read Tue, Sep 22, 2026, 3:36 PM UTC.