M4.6 earthquake 80 km WNW of Santa Cruz, Chile

A magnitude 4.6 earthquake struck 80 km WNW of Santa Cruz, Chile on Thu, Mar 28, 1985, 10:51 PM GMT-4 (02:51 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M7.2 59 km S of San Antonio, Chile. 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 1.6 and up: 28 in the 60 days after this one and 70 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event usp0002d9e. Read Tue, Sep 22, 2026, 8:50 PM UTC.