Report on Reventador (Ecuador) — 21 March-27 March 2012
Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
21 March-27 March 2012
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2012. Report on Reventador (Ecuador). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 21 March-27 March 2012. Smithsonian Institution and US Geological Survey.
0.077°S, 77.656°W; summit elev. 3562 m
All times are local (unless otherwise noted)
IG reported that during 21-25 March storm clouds prevented observations of Reventador. During 25-26 March incandescence from a high part of the volcano was observed. On 26 March a steam emission rose 500 m above the crater. Based on analysis of satellite imagery and seismic data, the Washington VAAC reported that an ash plume drifted 25 km NNW on 26 March. Later that day the ash had dissipated and seismicity decreased.
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.