The Volcanic history of Furnas Volcano, Sao Miguel, Azores

(2015) The Volcanic history of Furnas Volcano, Sao Miguel, Azores. In: UNSPECIFIED, (ed.) Volcanic Geology of Sao Miguel Island (Azores Archipelago). Memoir, 44 (44). Geological Society of London, London, pp. 125-134. ISBN UNSPECIFIED

[img] Text
Chap9_SaoMig-827_Duncan_a-MergedFile_with table in the middle of figures....pdf

Download (7MB)


Furnas is the easternmost of the trachytic active central volcanoes of S. Miguel. Unlike the other central volcanoes, Sete Cidades and Fogo, Furnas does not have a substantial edifice built up above sea level. Though not as dominant as the other two volcanoes, Furnas does, however, have an edifice rising from the basal basaltic lavas exposed on the north coast to around 600 m asl on the northern rim of the main caldera. In common with Sete Cidades and Fogo, Furnas had major trachytic explosive eruptions in its volcanic history which emplaced welded ignimbrites. In the last 5 ka Furnas has had 10 moderately explosive trachytic eruptions of Sub-Plinian character, two of these have taken place since the island was settled in the mid-15th century. A future eruption of Sub-Plinian magnitude is a major hazard posed by Furnas volcano. Even when not in eruption Furnas is a hazardous environment. Its fumarolic fields discharge high levels of CO2 and concentrations in some area of Furnas village present a risk to health; the steep slopes and poorly consolidated volcanic materials are prone to landslides in particular when triggered by earthquakes or as was the case in 1997, when landslides caused severe damage and casualties in Ribeira Quente following heavy rain.

Item Type: Book Section
Subjects: Q Science > QE Geology
Depositing User: Symplectic Admin
Date Deposited: 30 Sep 2015 15:16
Last Modified: 01 Sep 2016 01:30
DOI: 10.1144/M44.16
Repository Staff Access