M5.7 earthquake 3 km SSE of San Antonio, Chile

A magnitude 5.7 earthquake struck 3 km SSE of San Antonio, Chile on Thu, Sep 26, 1985, 4:33 AM GMT-4 (08:33 UTC), 47 km (29 mi) below the surface.

Map

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

Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.

Mag.	Scale	Computed by	Notes
5.7	Ms, surface-wave	USGS National Earthquake Information Center	Preferred · Reviewed · 1 stations
5.78	Mw, moment	ISC-GEM global catalog	Final · ±0.53

The USGS’s account of the effects of this earthquake.

Felt (VI) at San Antonio.

From the USGS event page for usp0002k4w. U.S. Geological Survey text and figures are in the public domain.

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

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 2.7 and up: 9 in the 60 days after this one and 3 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event usp0002k4w (also filed as iscgem516729). Read Thu, Oct 1, 2026, 1:24 PM UTC.