A magnetotelluric study across Sete Cidades Volcano, São Miguel Island, Azores

Along a N20E striking profile at Sete Cidades Volcano (Sao Miguel Island, Azores) we recorded broadband magnetotelluric data at 4 sites in the period range 8s – 30000s. Data were processed with a robust code and decomposed into local and regional Groom-Bayley parameters. The geoelectrical strike, N60W, is in agreement with one of the major fault zones in the area. 1D inverted models indicate the existence of a hydrothermal zone (probably a magma chamber) bellow 1 km depth.