Chile earthquakes

M6.3 earthquake 120 km WNW of Copiapó, Chile

A magnitude 6.3 earthquake struck 120 km WNW of Copiapó, Chile on Tue, Jul 31, 1973, 6:51 AM GMT-4 (10:51 UTC), 33 km (21 mi) below the surface.

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Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude: 6.3 (ms), strong
Local time: Tue, Jul 31, 1973, 6:51 AM GMT-4
UTC: 1973-07-31 10:51:13 UTC
Depth: 33.0 km (20.5 mi), shallow
Epicenter: 27.118° S, 71.514° W
Region: Chile
Strongest shaking: V, moderate shaking
Tsunami flag: No
Status: Reviewed by a seismologist

Shaking

The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.

Strongest estimated: V, moderate shaking
Peak ground acceleration: 6.1% of gravity
Peak ground velocity: 1.6 cm/s
Map: Automatic

USGS ShakeMap: estimated shaking intensity around the epicenter — Estimated shaking intensity. Map: USGS ShakeMap.

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Depth from: OPERATOR_ASSIGNED
Stations used: 96

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 3.3 and up: 27 in the 60 days after this one and 47 in the 30 days before it.

After

Before

Earthquakes today Chile earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp00002xr (also filed as atlas19730731105110, iscgem758892). Read Mon, Sep 28, 2026, 5:05 PM UTC.