M3.5 earthquake Central California

A magnitude 3.5 earthquake struck in Central California on Wed, Apr 9, 1975, 8:47 AM PDT (15:47 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M3.6 11 km NW of Parkfield, 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: 194 in the 60 days after this one and 0 in the 30 days before it.

The first 60 of 194.

From the USGS Earthquake Hazards Program and its partner networks, event nc1023480. Read Tue, Sep 22, 2026, 8:48 PM UTC.