M2.2 earthquake 6 km NNW of Biola, California

A magnitude 2.2 earthquake struck 6 km NNW of Biola, California on Thu, Oct 31, 1985, 3:22 AM PST (11:22 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M2.7 7 km ENE of Avenal, 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: 135 in the 60 days after this one and 64 in the 30 days before it.

The first 60 of 135.

From the USGS Earthquake Hazards Program and its partner networks, event nc57987. Read Wed, Sep 23, 2026, 5:05 AM UTC.