M1.8 earthquake 24 km NE of Greenfield, California

A magnitude 1.8 earthquake struck 24 km NE of Greenfield, California on Fri, Dec 13, 1985, 7:16 PM PST (03:16 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M2.4 4 km NE 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: 197 in the 60 days after this one and 0 in the 30 days before it.

The first 60 of 197.

From the USGS Earthquake Hazards Program and its partner networks, event nc61428. Read Tue, Sep 22, 2026, 9:30 PM UTC.