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Report on Reventador (Ecuador) — 15 July-21 July 2015

Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 15 July-21 July 2015
Managing Editor: Sally Kuhn Sennert

Please cite this report as:

Global Volcanism Program, 2015. Report on Reventador (Ecuador). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 15 July-21 July 2015. Smithsonian Institution and US Geological Survey.

Volcano Profile |  Weekly Report (15 July-21 July 2015)


Reventador

Ecuador

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

All times are local (unless otherwise noted)


During 15-21 July IG reported a high level of seismic activity including explosions, tremor, long-period earthquakes, harmonic tremor, and signals indicating emissions at Reventador; cloud cover often prevented visual observations. On 14 July a steam-and-ash plume rose 1 km and drifted W, and on 16 July an ash plume rose 1.3 km and drifted NW. On 17 July an ash plume rose 700 m, and light gray deposits possibly from a pyroclastic flow were observed. On 20 July explosions produced ash plumes that rose 1 km and drifted NW. The next day a steam-and-ash plume rose 1.5 km and drifted E. Explosions ejected incandescent material onto the flanks.

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: Instituto Geofísico-Escuela Politécnica Nacional (IG)