M2.1 earthquake 4 km NNW of Round Valley, California

A magnitude 2.1 earthquake struck 4 km NNW of Round Valley, California on Mon, Mar 25, 1985, 8:18 AM PST (16:18 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M4.7 4 km SE of Swall Meadows, 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: at least 200 in the 60 days after this one and 140 in the 30 days before it.

The first 60 of at least 200.

From the USGS Earthquake Hazards Program and its partner networks, event nc44747. Read Sun, Oct 4, 2026, 6:55 AM UTC.