Calbuco Vulcano, Llanquihue National Reserve, Los Lagos Region, Chile

Geology
Calbuco is a very explosive andesite volcano whose lavas usually contain 55 to 60% silicon dioxide (SiO2). It is elongated in a SW-NE direction and is capped by a 400-500 meter wide summit crater. Its complex evolution included the collapse of an intermediate edifice during the late Pleistocene that produced a debris avalanche that reached Llanquihue Lake.
• Volcanic activity
Calbuco has had 36 confirmed eruptions during the Holocene, 13 of which have been recorded in historical times. 20th century eruptions took place in 1906, 1907, 1909, 1911, 1917, 1929, 1932, 1945, 1961, and 1972. A series of three eruptions occurred from April 22–30, 2015.