M1.9 earthquake 20 km NE of Upper Lake, California

A magnitude 1.9 earthquake struck 20 km NE of Upper Lake, California on Tue, Sep 10, 1985, 3:44 PM PDT (22:44 UTC), -1 km (-1 mi) below the surface.

A larger quake followed: M2.3 6 km ENE of Williams, 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: 178 in the 60 days after this one and 0 in the 30 days before it.

The first 60 of 178.

From the USGS Earthquake Hazards Program and its partner networks, event nc55845. Read Tue, Sep 22, 2026, 4:10 PM UTC.