Report on Nevado del Huila (Colombia) — 21 February-27 February 2007
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 21 February-27 February 2007
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2007. Report on Nevado del Huila (Colombia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 21 February-27 February 2007. Smithsonian Institution and US Geological Survey.
Nevado del Huila
2.93°N, 76.03°W; summit elev. 5364 m
All times are local (unless otherwise noted)
INGEOMINAS reported that seismic activity from Nevado del Huila remained elevated during 21-23 February. On 21 February, steam plumes rose to altitudes of 5.7 km (18,700 ft) a.s.l. and drifted W. On 24 February, fumarolic activity from the central and N areas on the volcano was not seen during aerial observations.
Geologic Background. Nevado del Huila, the highest peak in the Colombian Andes, is an elongated N-S-trending volcanic chain mantled by a glacier icecap. The andesitic-dacitic volcano was constructed within a 10-km-wide caldera. Volcanism at Nevado del Huila has produced six volcanic cones whose ages in general migrated from south to north. The high point of the complex is Pico Central. Two glacier-free lava domes lie at the southern end of the volcanic complex. The first historical activity was an explosive eruption in the mid-16th century. Long-term, persistent steam columns had risen from Pico Central prior to the next eruption in 2007, when explosive activity was accompanied by damaging mudflows.