M2.5 earthquake 5 km ENE of Williams, California

A magnitude 2.5 earthquake struck 5 km ENE of Williams, California on Tue, Sep 17, 1985, 8:44 PM PDT (03:44 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M3.1 5 km WSW 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: 174 in the 60 days after this one and 0 in the 30 days before it.

The first 60 of 174.

From the USGS Earthquake Hazards Program and its partner networks, event nc55283. Read Tue, Sep 22, 2026, 4:10 PM UTC.