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Report on Galeras (Colombia) — 31 October-6 November 2007

Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 31 October-6 November 2007
Managing Editor: Sally Kuhn Sennert

Please cite this report as:

Global Volcanism Program, 2007. Report on Galeras (Colombia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 31 October-6 November 2007. Smithsonian Institution and US Geological Survey.

Volcano Profile |  Weekly Report (31 October-6 November 2007)


Galeras

Colombia

1.22°N, 77.37°W; summit elev. 4276 m

All times are local (unless otherwise noted)


Based on visual observations during clear weather, INGEOMINAS reported that steam-and-ash plumes from Galeras rose to a maximum altitude of 5.7 km (18,700 ft) a.s.l. during 29 October-4 November. The Alert Level remained at 3 (changes in the behavior of volcanic activity have been noted) on a scale of 4-1.

Geologic Background. Galeras, a stratovolcano with a large breached caldera located immediately west of the city of Pasto, is one of Colombia's most frequently active volcanoes. The dominantly andesitic complex has been active for more than 1 million years, and two major caldera collapse eruptions took place during the late Pleistocene. Long-term extensive hydrothermal alteration has contributed to large-scale edifice collapse on at least three occasions, producing debris avalanches that swept to the west and left a large horseshoe-shaped caldera inside which the modern cone has been constructed. Major explosive eruptions since the mid-Holocene have produced widespread tephra deposits and pyroclastic flows that swept all but the southern flanks. A central cone slightly lower than the caldera rim has been the site of numerous small-to-moderate historical eruptions since the time of the Spanish conquistadors.

Source: Servicio Geológico Colombiano (SGC)