The Frequency and Magnitude of Post-Glacial Explosive Eruptions at Volcán Mocho-Choshuenco, Southern Chile
Journal of Volcanology and Geothermal Research 299 (2015) 103–129 Contents lists available at ScienceDirect Journal of Volcanology and Geothermal Research journal homepage: www.elsevier.com/locate/jvolgeores The frequency and magnitude of post-glacial explosive eruptions at Volcán Mocho-Choshuenco, southern Chile Harriet Rawson a,⁎,JoséA.Naranjob, Victoria C. Smith c, Karen Fontijn a,d, David M. Pyle a, Tamsin A. Mather a,HugoMorenoe a Dept. Earth Sciences, University of Oxford, South Parks Road, Oxford OX1 3AN, UK b Servicio Nacional de Geología y Minería, Avenida Santa María 0104, Santiago, Chile c Research Lab. for Archaeology, University of Oxford, South Parks Road, Oxford OX1 3QY, UK d Dept. Geology and Soil Science, Ghent University, Krijgslaan 281-S8, 9000 Gent, Belgium e Observatorio Volcanológico de Los Andes del Sur, Servicio Nacional de Geología y Minería; Dinamarca 691, Temuco, Chile article info abstract Article history: Volcán Mocho-Choshuenco (39°55′S 72°2′W) is one of the most hazardous volcanoes in Chile′sSouthernVolcanic Received 20 November 2014 Zone (SVZ). To better evaluate these hazards, we have reconstructed a high resolution eruption history, the most Accepted 16 April 2015 detailed to date for a volcano in Chile, from detailed field observations and geochemical analyses. Mocho- Available online 25 April 2015 Choshuenco has experienced ca. 75 post-glacial (b18 ka) explosive eruptions, including three large (volume ≥1km3) Plinian eruptions (Neltume, Pirehueico and Huilo) and a large pyroclastic density current and associated Keywords: fi Tephrochronology sub-Plinian event (Enco). Poor preservation and lack of exposure made it dif cult to distinguish between medial fi Mocho-Choshuenco Volcano to distal deposits solely on eld observations.
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