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Report on Cotopaxi (Ecuador) — 7 October-13 October 2015


Smithsonian Institution / US Geological Survey
Weekly Volcanic Activity Report, 7 October-13 October 2015
Managing Editor: Sally Sennert.

Please cite this report as:

Global Volcanism Program, 2015. Report on Cotopaxi (Ecuador) (Sennert, S, ed.). Weekly Volcanic Activity Report, 7 October-13 October 2015. Smithsonian Institution and US Geological Survey.

Weekly Report (7 October-13 October 2015)



0.677°S, 78.436°W; summit elev. 5911 m

All times are local (unless otherwise noted)

IG reported that during 7-13 October gas, steam, and ash plumes rose from Cotopaxi as high as 2.5 km above the crater and drifted NW, W, and SW. Ash fell on the N flank on 7 October. Ashfall was also reported in El Chasqui Chaupi, Machachi (24 km NW), Aloag (28 km NW), and Obelisco on 8 October, and in San Ramón, San Agustín, San Isidro (58 km N), Rumipamba de Espinosas (53 km NNW), Callo Mancheno, Santa Catalina (52 km N), and San Francisco on 13 October.

Geological Summary. The symmetrical, glacier-covered, Cotopaxi stratovolcano is Ecuador's most well-known volcano and one of its most active. The steep-sided cone is capped by nested summit craters, the largest of which is about 550 x 800 m in diameter. Deep valleys scoured by lahars radiate from the summit of the andesitic volcano, and large andesitic lava flows extend to its base. The modern edifice has been constructed since a major collapse sometime prior to about 5,000 years ago. Pyroclastic flows (often confused in historical accounts with lava flows) have accompanied many explosive eruptions, and lahars have frequently devastated adjacent valleys. Strong eruptions took place in 1744, 1768, and 1877. Pyroclastic flows descended all sides of the volcano in 1877, and lahars traveled more than 100 km into the Pacific Ocean and western Amazon basin. Smaller eruptions have been frequent since that time.

Source: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)