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Report on Reventador (Ecuador) — 31 August-6 September 2005


Reventador

Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
31 August-6 September 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, 31 August-6 September 2005. Smithsonian Institution and US Geological Survey.

Weekly Report (31 August-6 September 2005)

Reventador

Ecuador

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

All times are local (unless otherwise noted)


During 22-28 August, there was a decrease in activity at Reventador in comparison to the previous week. Seismicity and gas emissions decreased at the volcano, and no surficial changes were observed. On 1 September a pilot reported an ash cloud to the Washington VAAC, but no ash was visible on satellite imagery.

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)