M1.8 earthquake Central California

A magnitude 1.8 earthquake struck in Central California on Mon, Aug 5, 1985, 3:33 AM PDT (10:33 UTC), 8 km (5 mi) below the surface.

A larger quake followed: M4.3 Central 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 199 in the 60 days after this one and at least 200 in the 30 days before it.

The first 60 of at least 199.

From the USGS Earthquake Hazards Program and its partner networks, event nc52259. Read Thu, Sep 24, 2026, 11:40 AM UTC.