M3.0 earthquake 5 km SW of Cobb, California

A magnitude 3.0 earthquake struck 5 km SW of Cobb, California on Sun, Jul 5, 1987, 5:21 PM PDT (00:21 UTC), 0 km (0 mi) below the surface.

A larger quake followed: M3.1 6 km SW of Cobb, 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: 166 in the 60 days after this one and 124 in the 30 days before it.

The first 60 of 166.

From the USGS Earthquake Hazards Program and its partner networks, event nc102732. Read Wed, Sep 30, 2026, 5:37 PM UTC.