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Report on Reventador (Ecuador) — 18 September-24 September 2013

Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 18 September-24 September 2013
Managing Editor: Sally Kuhn Sennert

Please cite this report as:

Global Volcanism Program, 2013. Report on Reventador (Ecuador). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 18 September-24 September 2013. Smithsonian Institution and US Geological Survey.

Volcano Profile |  Weekly Report (18 September-24 September 2013)


Reventador

Ecuador

0.077°S, 77.656°W; summit elev. 3562 m

All times are local (unless otherwise noted)


IG reported that seismicity remained elevated at Reventador during 18-24 September. Although cloud cover often prevented observations, ash plumes were occasionally observed. On 19 September an ash plume drifted W, and on 21 September multiple low-energy steam emissions contained small amounts of ash. Deposits from a pyroclastic flow that had descended the S flank were observed on 22 September.

Geologic Background. 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 Volcán El Reventador stratovolcano rises to 3562 m above the 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 comparable to the caldera rim. It 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 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.

Source: Instituto Geofísico-Escuela Politécnica Nacional (IG)