M4.5 earthquake 40 km SW of Valparaíso, Chile

A magnitude 4.5 earthquake struck 40 km SW of Valparaíso, Chile on Wed, Oct 10, 1973, 6:09 PM GMT-3 (21:09 UTC), 46 km (29 mi) below the surface.

A larger quake followed: M5.1 34 km WSW of Valparaíso, 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 1.5 and up: 7 in the 60 days after this one and 28 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event usp00003ss. Read Tue, Sep 22, 2026, 7:09 AM UTC.