Chile earthquakes

M5.7 earthquake 72 km WSW of San Antonio, Chile

A magnitude 5.7 earthquake struck 72 km WSW of San Antonio, Chile on Mon, Mar 4, 1985, 10:49 AM GMT-3 (13:49 UTC), 29 km (18 mi) below the surface.

A larger quake followed: M6.3 17 km S of Melipilla, 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: 5.7 (mw), moderate
Local time: Mon, Mar 4, 1985, 10:49 AM GMT-3
UTC: 1985-03-04 13:49:29 UTC
Depth: 29.3 km (18.2 mi), shallow
Epicenter: 33.916° S, 72.283° W
Region: Chile
Strongest shaking: IV, light 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: IV, light shaking
Peak ground acceleration: 4.8% of gravity
Peak ground velocity: 0.9 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: CONSTRAINED_BY_DEPTH_PHASES

Nearest places

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

Nearby

Within 100 km, magnitude 2.5 and up: 105 in the 60 days after this one and 43 in the 30 days before it.

After

The first 60 of 105.

Before

Earthquakes today Chile earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0002ce9 (also filed as gcmtb030485c, gcmt19850304134929, iscgem529148). Read Wed, Sep 23, 2026, 12:52 AM UTC.