Magnetic study of the Furnas caldera (Azores)

Isabel Blanco, Alicia García, J. Miquel Torta

Producción científica: Artículo en revista indizadaArtículorevisión exhaustiva

8 Citas (Scopus)

Resumen

A local ground magnetic study of the Furnas caldera (S. Miguel Island, Azores) has provided new insight into the magnetic structure of this volcano. Analysis of the data comprised removal of the IGRF, reduction to the pole, pseudogravity integration and upward continuation. Also, a spectral method was applied to estimate the depth to the magnetic sources, as well as a 2.5D forward modelling technique. Magnetic properties obtained at the laboratory for some representative sample rocks were considered in the modelling process. The most relevant features are the existence of an important negative anomaly inside the caldera and of an intense positive anomaly to the south of the coast. The former points out a decrease in the magnetization of the caldera filling materials with respect to the surrounding rocks, which could be explained as the result of post-eruption processes such as hydrothermal alteration. This is expected as Furnas has an active hydrothermal system probably related with a magmatic reservoir at high temperature. The positive anomaly suggests the existence of a strongly-magnetized body beneath the south coast.

Idioma originalInglés
Páginas (desde-hasta)341-359
Número de páginas19
PublicaciónAnnali di Geofisica
Volumen40
N.º2
EstadoPublicada - 1997
Publicado de forma externa

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