Report on Reventador (Ecuador) — 6 April-12 April 2005
Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
6 April-12 April 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, 6 April-12 April 2005. Smithsonian Institution and US Geological Survey.
0.077°S, 77.656°W; summit elev. 3562 m
All times are local (unless otherwise noted)
A change in seismic behavior was noted at Reventador during 1-8 April that was marked by episodes of tremor. About 45 tremor episodes occurred regularly during the week. During the evening of 6 April, incandescence was visible at the volcano. Based on information from IG, the Washington VAAC reported that ash from Reventador was visible on 8 April around 1430 at a height of ~4.6 km (15,000 ft a.s.l.). Ash was not visible on satellite imagery.
Geological Summary. 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.