California earthquakes

M1.7 earthquake 25 km SW of Three Rocks, California

A magnitude 1.7 earthquake struck 25 km SW of Three Rocks, California on Sat, May 16, 1981, 4:35 PM PDT (23:35 UTC), 14 km (9 mi) below the surface.

A larger quake followed: M1.9 14 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
1.7 (md), micro
Local time
UTC
1981-05-16 23:35:16 UTC
Depth
14.4 km (9.0 mi), shallow
Epicenter
36.313° N, 120.553° 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 0.6 km horizontally, 0.4 km in depth
Magnitude uncertainty
±0.08
Depth from
From location
Station coverage gap
205°, poorly surrounded by stations
Stations used
17

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 130 in the 60 days after this one and 53 in the 30 days before it.

After

The first 60 of 130.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc1063709. Read Tue, Sep 22, 2026, 7:48 PM UTC.