The U.S. Geological Survey said the epicenter was 10 kilometers (6.2 miles) below the surface, about 142 kilometers (88 miles) west of Ancud, a town 1,120 kilometers (696 miles) south of the Chilean capital, Santiago.
The National Emergency Office said in a tweet that authorities were checking for any “possible damage to people, alteration of basic services or infrastructure.”
The Chilean navy’s Hydrographic and Oceanographic Service ruled out the possibility of a tsunami.
Chile sits along the so-called “Ring of Fire” of the Pacific, and it has frequent earthquakes. In 2010, a quake of magnitude 8.8 set off a devastating tsunami that killed 526 people and collapsed more than 220,000 homes in the south-central part of the country.