Report on Nevado del Ruiz (Colombia) — 11 January-17 January 2017
Smithsonian Institution / US Geological Survey
Weekly Volcanic Activity Report, 11 January-17 January 2017
Managing Editor: Sally Sennert.
Please cite this report as:
Global Volcanism Program, 2017. Report on Nevado del Ruiz (Colombia) (Sennert, S, ed.). Weekly Volcanic Activity Report, 11 January-17 January 2017. Smithsonian Institution and US Geological Survey.
Nevado del Ruiz
4.892°N, 75.324°W; summit elev. 5279 m
All times are local (unless otherwise noted)
Based on information from Servicio Geológico Colombiano (SGC), the Washington VAAC reported that on 13 January an ash emission rose from Nevado del Ruiz to an altitude of 7 km (23,000 ft) a.s.l. and drifted N. Weather clouds prevented satellite views of the emission, and the webcam recorded gas-and-steam emissions with possible ash content.
Geological Summary. Nevado del Ruiz is a broad, glacier-covered volcano in central Colombia that covers more than 200 km2. Three major edifices, composed of andesitic and dacitic lavas and andesitic pyroclastics, have been constructed since the beginning of the Pleistocene. The modern cone consists of a broad cluster of lava domes built within the caldera of an older edifice. The 1-km-wide, 240-m-deep Arenas crater occupies the summit. The prominent La Olleta pyroclastic cone located on the SW flank may also have been active in historical time. Steep headwalls of massive landslides cut the flanks. Melting of its summit icecap during historical eruptions, which date back to the 16th century, has resulted in devastating lahars, including one in 1985 that was South America's deadliest eruption.