M1.7 earthquake 6 km S of Sunol, California

A magnitude 1.7 earthquake struck 6 km S of Sunol, California on Fri, May 23, 1975, 5:33 AM PDT (12:33 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M2.3 9 km NW of Hollister, 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: 170 in the 60 days after this one and 0 in the 30 days before it.

The first 60 of 170.

From the USGS Earthquake Hazards Program and its partner networks, event nc1023962. Read Tue, Sep 22, 2026, 9:39 PM UTC.