Planchón-Peteroa is an elongated complex volcano along the Chile-Argentina border with several overlapping calderas.
Activity began in the Pleistocene with construction of the basaltic- to dacitic Volcán Azufre, followed by formation of
basaltic and basaltic-andesite Volcán Planchón, 6 km to the north. About 11,500 years ago, much of Azufre and part
of Planchón collapsed, forming the massive Río Teno debris avalanche, which traveled 95 km to reach Chile's Central
Valley. Subsequently, Volcán Planchón II was formed. The youngest volcano, andesitic and basaltic-andesite
Volcán Peteroa, consists of scattered vents between Azufre and Planchón. Peteroa has been active into historical time
and contains a small steaming crater lake. Historical eruptions from the Planchón-Peteroa complex have been
dominantly explosive, although lava flows were erupted in 1837 and 1937.



Summit elevation is 4107 m 13,474 feet. Position is about 35.240°S - 35°14'24"S, 70.570°W - 70°34'12"W

September 8th, 2010
Planchón has been erupting in the last few days, spewing pyroclastic material and gases.
The plume yesterday reached as high as 1.2 kilometer (0.75 mile) above the crater.
It is normal to see smoke coming from the crater, but yesterday was a minor explosion, which forced the SERNAGEOMIN in Chile to investigate further, and they are sending an airplane over the area to day.
An earthquake of 5.2 opn Richer was also reported yesterday, not too far from this volcano.