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Latest news from Sangay volcano:

Sangay volcano (Ecuador), activity update: growing lava dome, lava flows and ash explosions
View of the upper SE flank of Sangay volcano and thermal image showing the various vents at the dome emitting lava flows that form several branches and reach the base of the summit cone (Photo: P. Ramón OVT/IG)
Tuesday, Apr 17, 2012
During an overflight on 13 April, an explosion from Sangay volcano was observed at 08:25 local time. It generated an ash and steam column of 2 km abov... [more]
Sangay volcano (Ecuador) activity update: occasional explosions, ash plume to 8 km altitude on 22 March
Thursday, Mar 29, 2012
According to the Washington VAAC, a pilot observed an ash plume from Sangay on 22 March that rose to an altitude of 8.2 km (27,000 ft) a.s.l. Cloud co... [more]

Sangay volcano

stratovolcano 5230 m (17,159 ft)
Ecuador, -2°S / -78.34°W
Current status: erupting (4 out of 5)
Sangay webcams / live data
last update: 17 Apr 2012 (growing lava dome, lava flows and ash explosions)
Typical eruption style: Explosive. In historic time: frequent, intermittent strombolian activity
Sangay volcano eruptions: 1628-?, 1728-1916, 1934 - 2007
Sangay volcano is one of the highest active volcanoes in the world and one of Ecuador's most active ones. Located isolated east of the Andean crest, with it's perfect steep cone shape and glacier-covered top, it towers majestically at 5230 m high above the Amazonian rainforest.

Background:

Sangay has had frequent eruptions in historic times, mostly of strombolian type. The present-day volcano was built within horseshoe-shaped calderas of two previous edifices, which were destroyed by collapse to the east, producing large debris avalanches that reached the Amazonian lowlands. The modern edifice dates back to at least 14,000 years ago.
Sangay towers above the tropical jungle on the east side; on the other sides flat plains of ash from the volcano have been sculpted by heavy rains into steep-walled canyons up to 600 m deep. The earliest report of a historical eruption was in 1628. More or less continuous eruptions were reported from 1728 until 1916, and again from 1934 to the present. The more or less constant eruptive activity has caused frequent changes to the morphology of the summit crater complex.

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Source: GVP Sangay volcano information