Comparative behaviour and evolution of the caldera forming active volcanoes of Sao Miguel (Azores): Sete Cidades, Fogo and Furnas

Wallenstein, N and Duncan, Angus and Chester, David K. and Cole, Paul D and Queiroz, Gabriela and Gaspar, Joao. L. and Pacheco, Jose and Guest, J.E. (2018) Comparative behaviour and evolution of the caldera forming active volcanoes of Sao Miguel (Azores): Sete Cidades, Fogo and Furnas. In: European Geophysical Union (Geophysical Research Abstracts 20, 2018), April 8 -13 2018, Vienna. (Accepted for Publication)

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Abstract

São Miguel, with its E-W elongated shape, is the largest and the most volcanically active of the nine islands of the Azores archipelago. From West to East Sete Cidades, Fogo and Furnas are three active central volcanoes with calderas. Each of these three calderas evolved through several phases of collapse generated by Plinian scale explosive eruptions over the last 40 ka. The most recent Plinian scale eruption was that of Fogo A, c. 5ka, from Fogo volcano. In this report, we summarise the results of more than two decades of research on the geology of these volcanoes. More specifically we compare: the evolution of each caldera; and the styles of recent eruptions. It is of note that there is a pattern of a change in eruptive behaviour from around 5 ka shown by all three volcanoes to eruptions displaying a style involving switching between magmatic and phreatomagmatic sub-Plinian activity. This is well displayed in the historic sub-Plinian eruptions of Fogo and Furnas.

Item Type: Conference or Workshop Item (Lecture)
Keywords: Azores, São Miguel, Sete Cidades, Fogo, Furnas, Calderas, Explosive eruptions
Faculty / Department: Faculty of Science > Geography and Environmental Science
Depositing User: David Chester
Date Deposited: 12 Jan 2018 14:12
Last Modified: 12 Jan 2018 14:12
URI: http://hira.hope.ac.uk/id/eprint/2337

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