Reventador is the most frequently active of a chain of Ecuadorian volcanoes
in the Cordillera Real, well east of the principal volcanic axis.
The forested dominantly andesitic stratovolcano rises to 3562 m above the
remote jungles of the western Amazon basin. A 4-km-wide caldera widely breached to the east was formed by edifice collapse and is partially filled by a young, unvegetated stratovolcano that rises about 1300 m above the caldera floor to a height above the caldera rim. Reventador has been the source of numerous lava flows as well as explosive eruptions that were visible from Quito in historical time. Frequent lahars in this region of heavy rainfall have constructed a debris plain on the eastern floor of the caldera.
The largest historical eruption at Reventador took place in 2002, producing a 17-km-high eruption column, pyroclastic flows that traveled up to 8 km, and lava flows from summit and flank vents.
(The Smithsonian's Global Volcanism Program, http://www.volcano.si.edu/index.cfm)
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