Comment on: "Cobeñas, G., Thouret, J.-C., Bonadonna, C., Boivin, P., 2012. The c.2030yr BP Plinian eruption of El Misti volcano, Peru: Eruption dynamics and hazard implications. Journal of Volcanology and Geothermal Research 241-242, 105-120."

Christopher J. Harpel, S. de Silva, Guido Edgard Salas Álvarez

Resultado de la investigación: Contribución a una revistaComentario/Debate

3 Citas (Scopus)

Resumen

Cobeñas et al. (2012) describe deposits from the 2-ka eruption of Misti volcano, southern Peru. They propose a tephra-fall deposit overlain by voluminous pyroclastic-flow and surge deposits, which are overlain by proportionally minor lahar deposits and a debris-avalanche deposit of limited distribution. Some of their data corroborate our earlier work (Harpel et al., 2011), but three of their primary interpretations differ dramatically from ours and have important hazard implications. Voluminous flowage deposits crop out, and we present evidence that the majority contain diagnostic features suggesting that they are lahar deposits rather than pyroclastic-flow deposits. Their pyroclastic-flow deposit volume is also unrealistically large and not consistent with the extant deposits. The purported debris-avalanche deposit is texturally identical to the lahar deposits and has none of the features typically associated with debris-avalanche deposits. Associating such a unit with collapse and formation of a notch in the south crater rim lacks supporting data and disregards the myriad other reasons such notches can form. They divide the tephra-fall deposit into three beds, suggest that it underlies the pyroclastic-flow deposits, and infer that the eruption ceased after pyroclastic flow formation. We delineate six beds and present evidence that the upper beds persistently crop out between the pyroclastic-flow and lahar deposits. We infer from our eruption sequence that the eruption continued vigorously after pyroclastic-flow formation.

Idioma originalInglés
Páginas (desde-hasta)94-101
Número de páginas8
PublicaciónJournal of Volcanology and Geothermal Research
Volumen265
DOI
EstadoPublicada - 1 set. 2013

Nota bibliográfica

Funding Information:
Fieldwork funded by the Office of Foreign Disaster Assistance of the US Agency for International Development via the US Geological Survey Volcano Disaster Assistance Program , a 2006 Geological Society of America Harold T. Stearns Fellowship , and a 2005 Kleinman Grant . Logistical support in the field provided by the Universidad Nacional de San Agustín de Arequipa, Peru. This comment greatly benefited from discussions with William Scott and was improved by the helpful observations of an anonymous reviewer.

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