M1.6 earthquake Central California

A magnitude 1.6 earthquake struck in Central California on Thu, Sep 22, 1977, 8:53 AM PDT (15:53 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M3.8 10 km SW of Oak Shores, 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: 179 in the 60 days after this one and 89 in the 30 days before it.

The first 60 of 179.

From the USGS Earthquake Hazards Program and its partner networks, event nc1036948. Read Sat, Oct 3, 2026, 6:46 PM UTC.