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Above photographs by Steve O'Meara of Volcano Watch International.
Guallatiri, one of the most active volcanoes in northern Chile, is the youngest volcano of three that make up the Nevados de Quimsachata range. Guallatiri, along with Cerro Acotango and Cerro Elena Capurata, form this volcanic range. Guallatiri is the southern most volcano in the Central Andes that has a permanent glaciated summit. In 1985 and 1987 whitish-yellow fumes were being expelled from a vent to a height of 500m every 30 minutes.
Sources of Information:
De Silva, Shanaka & Peter W. Francis; Volcanoes of the Central Andes, Springer-Verlag, New York, 1991 pp. 47-48
McClelland, L., Simkin, T., Summers, M., Nielsen, E., and Stein, T.C., 1989, Global Volcanism 1975-1985: Englewood Cliffs, New Jersey, Prentice Hall, 655 p.
Scientific Event Alert Network Bulletin (1985) 10, Nov., pp.7-8.
Scientific Event Alert Network Bulletin (1987) 12, Dec., pp.3-4.
Simkin, T., and Siebert, L., 1994, Volcanoes of the World: Geoscience Press, Tucson, Arizona, 349 p.