M2.8 earthquake Northern California

A magnitude 2.8 earthquake struck in Northern California on Sun, Jun 7, 1987, 6:43 AM PDT (13:43 UTC), 1 km (0 mi) below the surface.

A larger quake followed: M3.2 23 km NE of Potter Valley, 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: 172 in the 60 days after this one and 0 in the 30 days before it.

The first 60 of 172.

From the USGS Earthquake Hazards Program and its partner networks, event nc101563. Read Tue, Sep 22, 2026, 10:03 PM UTC.