M2.5 earthquake 6 km W of Cobb, California

A magnitude 2.5 earthquake struck 6 km W of Cobb, California on Thu, Mar 7, 1985, 11:17 PM PST (07:17 UTC), 3 km (2 mi) below the surface.

A larger quake followed: M2.8 6 km NW of Guinda, 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: 181 in the 60 days after this one and 0 in the 30 days before it.

The first 60 of 181.

From the USGS Earthquake Hazards Program and its partner networks, event nc43258. Read Tue, Sep 22, 2026, 4:16 PM UTC.