Agency dating northwest

The debris avalanche descended 2,100 metres (6,900 ft) and ran for 17 kilometres (11 mi) with an azimuth of 211°, eventually covering an area of 59 square kilometres (23 sq mi).The flow was channeled between Miño Volcano and Cerro Cumbre Negra (an eroded lava massif) towards the dry Rio Loa valley, favouring the preservation of the slide deposit.Lava flows, mostly from the summit areas, are dark to grey in colour and extend as far as 2–3 kilometres (1.2–1.9 mi) from their vents.It is likely that two small lava domes (Cerro Cumbre Negra and Summit 5867) on the northwest flank occupy flank vents.

The arc contains andesitic volcanoes, ignimbrites and compound volcanoes and has generated over 3,000 cubic kilometres (720 cu mi) of eruption products over 28 million years.The proximal parts of the slide are covered by younger eruptive products and also by moraines, indicating that the slide was followed by at least one glacial episode.The slide lacks the hummocky topography usually found on debris avalanches but has radial ridges and grooves.The cluster has generated lava ranging in composition from andesite to dacite, with the main volcano being exclusively of dacitic composition.Systematic variations in temperature, crystal and biotite content have been recorded during the evolution of the cluster.To bring the sulfur down, a road network to the summit was constructed in 1972, although it is now impassable.

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