M1.9 earthquake 10 km SW of Williams, California

A magnitude 1.9 earthquake struck 10 km SW of Williams, California on Wed, Aug 7, 1985, 11:27 AM PDT (18:27 UTC), 15 km (9 mi) below the surface.

A larger quake followed: M4.0 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: 185 in the 60 days after this one and 90 in the 30 days before it.

The first 60 of 185.

From the USGS Earthquake Hazards Program and its partner networks, event nc52543. Read Tue, Sep 29, 2026, 11:01 PM UTC.