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
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
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
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
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.