M2.1 earthquake 6 km WSW of Cobb, California

A magnitude 2.1 earthquake struck 6 km WSW of Cobb, California on Thu, Jul 16, 1987, 2:52 AM PDT (09:52 UTC), 1 km (1 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: 167 in the 60 days after this one and 116 in the 30 days before it.

The first 60 of 167.

From the USGS Earthquake Hazards Program and its partner networks, event nc103231. Read Thu, Oct 1, 2026, 5:20 AM UTC.