M1.8 earthquake 4 km SE of Isleton, California

A magnitude 1.8 earthquake struck 4 km SE of Isleton, California on Sun, Jul 7, 1985, 8:16 AM PDT (15:16 UTC), 4 km (3 mi) below the surface.

A larger quake followed: M2.1 11 km WSW of Mountain House, 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: 83 in the 60 days after this one and 36 in the 30 days before it.

The first 60 of 83.

From the USGS Earthquake Hazards Program and its partner networks, event nc1129540. Read Tue, Sep 22, 2026, 8:40 PM UTC.