M1.6 earthquake 10 km NW of Cobb, California

A magnitude 1.6 earthquake struck 10 km NW of Cobb, California on Mon, Oct 17, 1983, 10:54 AM PDT (17:54 UTC), -1 km (0 mi) below the surface.

A larger quake followed: M3.5 near the coast of Northern 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: 188 in the 60 days after this one and 105 in the 30 days before it.

The first 60 of 188.

From the USGS Earthquake Hazards Program and its partner networks, event nc1105094. Read Mon, Oct 5, 2026, 8:22 AM UTC.