Cerro Azul

Cerro Azul, sometimes referred to as Quizapu, is an active stratovolcano in the Maule Region of central Chile, immediately south of Descabezado Grande. Part of the South Volcanic Zone of the Andes, its summit is 3,788 meters above sea level, and is capped by a summit crater that is 500 meters wide and opens to the north. Beneath the summit, the volcano features numerous scoria cones and flank vents.

Cerro Azul is responsible for several of South America's largest recorded eruptions, in 1846 and 1932. In 1846, an effusive eruption formed the vent at the site of present-day Quizapu crater on the northern flank of Cerro Azul and sent lava flowing down the sides of the volcano, creating a lava field 8–9 square kilometres in area. Phreatic and Strombolian volcanism between 1907 and 1932 excavated this crater.