Planchón-Peteroa is a complex volcano extending in a north–south direction along the border between Argentina and Chile.

A partial collapse of the complex about 11,500 years ago produced a major debris avalanche, which followed the course of the Teno River until reaching the Chile Central Valley.

On September 21, the volcano erupted once again, emitting a dark gray plume of volcanic ash.

As winds blew the ash southeast into Argentina, residents there were warned by authorities to evacuate the nearby areas before Planchón-Peteroa would erupt again.

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