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Report on Reventador (Ecuador) — 12 January-18 January 2005

Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 12 January-18 January 2005
Managing Editor: Gari Mayberry

Please cite this report as:

Global Volcanism Program, 2005. Report on Reventador (Ecuador). In: Mayberry, G (ed.), Weekly Volcanic Activity Report, 12 January-18 January 2005. Smithsonian Institution and US Geological Survey.

Volcano Profile |  Weekly Report (12 January-18 January 2005)


Reventador

Ecuador

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

All times are local (unless otherwise noted)


On 14 January at 0700, the Washington VAAC reported that an ash plume was observed at Reventador. The plume rose to a height of ~4.5 km a.s.l. On 16 January at 0430, satellite imagery indicated a brief emission of steam and very light ash that rose to ~6 km a.s.l. and moved E.

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: Washington Volcanic Ash Advisory Center (VAAC)