Large explosive eruptions in the southern segment of the Southern Volcanic Zone occur on average every 725 years, and tephras from volcanoes in the Southern Volcanic Zone have been transported over large distances. The largest Holocene volcanic eruption of the Southern Andes occurred 6,700 years before present at Cerro Hudson. Tephra layers found at Mallín El Embudo have been attributed to Mentolat, as well as to Melimoyu and Cerro Hudson.