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Report on Sangay (Ecuador) — 30 March-5 April 2022


Sangay

Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
30 March-5 April 2022
Managing Editor: Sally Kuhn Sennert

Please cite this report as:

Global Volcanism Program, 2022. Report on Sangay (Ecuador). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 30 March-5 April 2022. Smithsonian Institution and US Geological Survey.

Weekly Report (30 March-5 April 2022)

Sangay

Ecuador

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

All times are local (unless otherwise noted)


IG reported that the eruption at Sangay continued during 30 March through 5 April. Weather clouds and rain often prevented visual and webcam observations, though daily gas-and-ash plumes that rose to 6.7 km (22,000 ft) a.s.l. and drifted W, SW, WSW, and NW were identified in satellite images by the Washington VAAC or in webcam views. As many as 96 daily explosions were detected along with frequent long-period events and emission tremors. Daily thermal anomalies were also visible in satellite data. Incandescent material was visible on the flanks in webcam imagery on clear weather days.

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.

Sources: Instituto Geofísico-Escuela Politécnica Nacional (IG), Washington Volcanic Ash Advisory Center (VAAC)