M2.3 earthquake 33km NW of Buttonwillow, CA

A magnitude 2.3 earthquake struck 33km NW of Buttonwillow, CA on Thu, Aug 8, 1985, 6:20 PM PDT (01:20 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M3.0 8 km S of Huron, 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: 199 in the 60 days after this one and 0 in the 30 days before it.

The first 60 of 199.

From the USGS Earthquake Hazards Program and its partner networks, event ci109034. Read Wed, Sep 23, 2026, 2:36 AM UTC.