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Cerro Azul,volcano, 12,428 ft (3,788 m) high, central Chile, in the Andes c.150 mi (240 km) S of Santiago. Also known as Quizapú after the large vent on the northern flank of the volcano, Cerro Azul has a summit crater 1,600 ft (500 m) wide. Quizapú, formed in 1846 during the volcano's first eruption in historical times, erupted in 1932 with massive force, spewing out ash and boulder-size material and creating a 400-sq-mi (1,000-sq-km) desert of hardened lava.
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