"Irruputuncu is a small stratovolcano that straddles the Chile/Bolivia border. It is the youngest and most southerly of a NE-SW-trending chain of volcanoes. Irruputuncu was constructed within the collapse scarp of a Holocene debris avalanche whose deposit extends to the SW. Subsequent eruptions filled much of this scarp and produced thick, viscous lava flows down the western flank. The summit complex contains two craters, the southernmost of which is fumarolically active. The first unambiguous historical eruption from Irruputuncu took place in November 1995, when phreatic explosions produced dark ash clouds."  -Smithsonian Volcano Archive
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