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Report on Reventador (Ecuador) — 28 December-3 January 2006


Reventador

Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
28 December-3 January 2006
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, 28 December-3 January 2006. Smithsonian Institution and US Geological Survey.

Weekly Report (28 December-3 January 2006)

Reventador

Ecuador

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

All times are local (unless otherwise noted)


IG reported that during 19-25 December, seismicity was at low levels at Reventador and several small explosions occurred. According to the Washington VAAC, satellite imagery showed an ash plume at a height around 7.6 km (25,000 ft) a.s.l. extending NW on 29 December.

Geological Summary. Volcán El 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 has 4-km-wide avalanche scarp open to the E formed by edifice collapse. A young, unvegetated, cone rises from the amphitheater floor about 1,300 m to a height comparable to the rim. It has been the source of numerous lava flows as well as explosive eruptions visible from Quito, about 90 km ESE. Frequent lahars in this region of heavy rainfall have constructed a debris plain on the eastern floor of the scarp. The largest recorded 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.

Sources: Washington Volcanic Ash Advisory Center (VAAC), Instituto Geofísico-Escuela Politécnica Nacional (IG)