M3.1 earthquake 139 km W of Ferndale, California

A magnitude 3.1 earthquake struck 139 km W of Ferndale, California on Thu, Nov 19, 1987, 4:58 AM PST (12:58 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M3.1 103km W of Trinidad, CA. 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: 10 in the 60 days after this one and 5 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event usp0003a8v. Read Tue, Sep 22, 2026, 10:32 PM UTC.