Report on Nevado del Huila (Colombia) — 27 May-2 June 2009
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 27 May-2 June 2009
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2009. Report on Nevado del Huila (Colombia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 27 May-2 June 2009. 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 a seismic swarm at Nevado del Huila on 28 May that included M 4 and M 4.8 earthquakes felt by local residents. On 31 May, an episode of tremor was associated with an ash emission seen on a web camera. Another pulse of tremor was detected on 2 June. The Alert Level remained at III (Yellow; "changes in the behavior of volcanic activity").
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.