Report on Nevado del Huila (Colombia) — 10 November-16 November 2010
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 10 November-16 November 2010
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2010. Report on Nevado del Huila (Colombia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 10 November-16 November 2010. 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)
According to the Washington VAAC, INGEOMINAS reported a seismic event from Nevado del Huila on 11 November consistent with a potential ash emission. A possible ash plume detected in satellite imagery drifted 25 km WSW. A subsequent notice stated that seismicity returned to background levels and the plume was no longer visible. INGEOMINAS reported that during 10-16 November whitish-colored gas plumes seen through the Tafxnú and Maravillas (12 km SE) web cameras rose 2 km above the crater. The Alert Level had been lowered to III (Yellow; "changes in the behavior of volcanic activity") on 12 October, and remained at that level during the reporting period.
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.