M1.8 earthquake 4 km ESE of Healdsburg, California

A magnitude 1.8 earthquake struck 4 km ESE of Healdsburg, California on Wed, Mar 13, 1985, 2:05 PM PST (22:05 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M2.3 5 km SW of Cobb, 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: 180 in the 60 days after this one and 0 in the 30 days before it.

The first 60 of 180.

From the USGS Earthquake Hazards Program and its partner networks, event nc43797. Read Tue, Sep 22, 2026, 11:21 AM UTC.