Chile earthquakes

M6.3 earthquake 39 km SW of San Antonio, Chile

A magnitude 6.3 earthquake struck 39 km SW of San Antonio, Chile on Mon, Mar 4, 1985, 3:06 AM GMT-3 (06:06 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M6.7 18 km S of Valparaíso, Chile. This one was a foreshock.

San Antonio forecast More in Chile

Map

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

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The earthquake

Magnitude: 6.3 (mw), strong
Local time: Mon, Mar 4, 1985, 3:06 AM GMT-3
UTC: 1985-03-04 06:06:56 UTC
Depth: 33.0 km (20.5 mi), shallow
Epicenter: 33.825° S, 71.930° W
Region: Chile
Strongest shaking: VI, strong 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: VI, strong shaking
Peak ground acceleration: 18.0% of gravity
Peak ground velocity: 2.3 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

Nearest places

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

Nearby

Within 100 km, magnitude 2.5 and up: 128 in the 60 days after this one and 38 in the 30 days before it.

After

The first 60 of 128.

Before

Earthquakes today Chile earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0002cdj (also filed as gcmtb030485b, gcmt19850304060657, atlas19850304060656, iscgem529115). Read Wed, Sep 23, 2026, 4:22 AM UTC.