Galeras Volcano: International Workshop and Eruption

F. A. Muñoz, M. L. Calvache, G. P. Cortes, D. M. Gomez, L. Narvaez, M. Ordonez, A. Ortega, R. Torres, B. Silva, Stanley Williams, C. O. Sanders, J. Stix

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Galeras, a 4270‐m high andesitic stratovolcano in southwestern Colombia near the Ecuadorian border (Figure 1), gradually reawoke in 1988 after more than 40 years of dormancy. In 1991, after a request from the Geological Survey of Colombia (INGEOMIAS) and the National Disaster Prevention Office (ONAD), Galeras was named a “Decade Volcano” by the International Association of Volcanology and Chemistry of the Earth's Interior (IAVCEI) as part of the United Nations' International Decade for Natural Disaster Reduction (IDNDR) program. A workshop was held in 1993 to research, monitor, and mitigate the hazards of the volcano. Galeras lies at latitude 1°14′N, longitude 77°22′W (see Figure 2), and its active cone rises about 150 m above the floor of a small summit caldera that is open to the west [Calvache and Williams, 1992]. The active crater is located about 6 km west of Pasto, a city of about 300,000 inhabitants. At least six major Galeras eruptions have been identified during the past 4500 years. These eruptions were mainly vulcanian, with inferred low‐altitude eruption columns (<10 km) that produced small‐volume pyroclastic flow deposits containing a high proportion of nonjuvenile material and lava flow fragments [Calvache and Williams, 1992]. During the last 500 years, eruptions have been characterized by gas and ash emissions, small lava flows, and explosive eruptions producing pyroclastic flows that have traveled up to 15 km from the crater [Calvache, 1990; Cepeda, 1993].

Original languageEnglish (US)
Pages (from-to)281-287
Number of pages7
JournalEos, Transactions American Geophysical Union
Volume74
Issue number26
DOIs
StatePublished - 1993

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volcano
volcanic eruption
pyroclastic flow
lava flow
crater
volcanology
stratovolcano
dormancy
natural disaster
United Nations
caldera
geological survey
explosive
ash
hazard
gas

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)

Cite this

Muñoz, F. A., Calvache, M. L., Cortes, G. P., Gomez, D. M., Narvaez, L., Ordonez, M., ... Stix, J. (1993). Galeras Volcano: International Workshop and Eruption. Eos, Transactions American Geophysical Union, 74(26), 281-287. https://doi.org/10.1029/93EO00391

Galeras Volcano : International Workshop and Eruption. / Muñoz, F. A.; Calvache, M. L.; Cortes, G. P.; Gomez, D. M.; Narvaez, L.; Ordonez, M.; Ortega, A.; Torres, R.; Silva, B.; Williams, Stanley; Sanders, C. O.; Stix, J.

In: Eos, Transactions American Geophysical Union, Vol. 74, No. 26, 1993, p. 281-287.

Research output: Contribution to journalArticle

Muñoz, FA, Calvache, ML, Cortes, GP, Gomez, DM, Narvaez, L, Ordonez, M, Ortega, A, Torres, R, Silva, B, Williams, S, Sanders, CO & Stix, J 1993, 'Galeras Volcano: International Workshop and Eruption', Eos, Transactions American Geophysical Union, vol. 74, no. 26, pp. 281-287. https://doi.org/10.1029/93EO00391
Muñoz FA, Calvache ML, Cortes GP, Gomez DM, Narvaez L, Ordonez M et al. Galeras Volcano: International Workshop and Eruption. Eos, Transactions American Geophysical Union. 1993;74(26):281-287. https://doi.org/10.1029/93EO00391
Muñoz, F. A. ; Calvache, M. L. ; Cortes, G. P. ; Gomez, D. M. ; Narvaez, L. ; Ordonez, M. ; Ortega, A. ; Torres, R. ; Silva, B. ; Williams, Stanley ; Sanders, C. O. ; Stix, J. / Galeras Volcano : International Workshop and Eruption. In: Eos, Transactions American Geophysical Union. 1993 ; Vol. 74, No. 26. pp. 281-287.
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