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Report on Sangay (Ecuador) — 16 June-22 June 2021


Sangay

Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
16 June-22 June 2021
Managing Editor: Sally Kuhn Sennert

Please cite this report as:

Global Volcanism Program, 2021. Report on Sangay (Ecuador). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 16 June-22 June 2021. Smithsonian Institution and US Geological Survey.

Weekly Report (16 June-22 June 2021)

Sangay

Ecuador

2.005°S, 78.341°W; summit elev. 5286 m

All times are local (unless otherwise noted)


IG reported a high level of activity at Sangay during 15-22 June. Weather clouds and rain often prevented visual and webcam observations of the volcano; almost daily lahars were detected by the seismic network. Ash plumes were identified in satellite images by the Washington VAAC ash plumes almost daily, rising as high as 1.2 km above the volcano and drifting W and SW. Thermal anomalies continued to be often visible in satellite data.

Geological Summary. The isolated Sangay volcano, located east of the Andean crest, is the southernmost of Ecuador's volcanoes and its most active. The steep-sided, glacier-covered, dominantly andesitic volcano grew 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. It towers above the tropical jungle on the east side; on the other sides flat plains of ash 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 almost constant activity has caused frequent changes to the morphology of the summit crater complex.

Source: Instituto Geofísico-Escuela Politécnica Nacional (IG)