Report on Sangay (Ecuador) — 23 January-29 January 2013

Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 23 January-29 January 2013
Managing Editor: Sally Kuhn Sennert

Please cite this report as:

Global Volcanism Program, 2013. Report on Sangay (Ecuador). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 23 January-29 January 2013. Smithsonian Institution and US Geological Survey.

Volcano Profile |  Weekly Report (23 January-29 January 2013)


Sangay

Ecuador

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

All times are local (unless otherwise noted)


Based on a pilot report, analyses of satellite images, and information from the Guayaquil MWO, the Washington VAAC reported that a possible eruption from Sangay before 1210 on 25 January may have produced ash plumes. Cloud cover prevented satellite observations of emissions during 25-26 January, although a weak thermal anomaly was detected.

Geologic Background. 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: Washington Volcanic Ash Advisory Center (VAAC)