M1.5 earthquake 19 km SW of Three Rocks, California

A magnitude 1.5 earthquake struck 19 km SW of Three Rocks, California on Sun, Oct 31, 1982, 6:10 PM PST (02:10 UTC), 19 km (12 mi) below the surface.

A larger quake followed: M1.7 11 km SSE of Tres Pinos, California. This one was a foreshock.

Map

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

No one has reported feeling this quake to the USGS.

Reviewed by a seismologist.

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

Within 100 km, magnitude 1.5 and up: 147 in the 60 days after this one and 50 in the 30 days before it.

The first 60 of 147.

From the USGS Earthquake Hazards Program and its partner networks, event nc1081234. Read Wed, Sep 23, 2026, 1:01 AM UTC.