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Estudio mt del área volcánica de Timanfaya (Lanzarote).

AuthorsGarcía García, Alicia
KeywordsZona volcánica
Isla de Lanzarote
Electromagnetic field
Magnetotelluric study
Issue Date1986
PublisherReal Sociedad Española de Física
CitationAnales de física. Serie B: 1986, 82 (ESP): 35-43
AbstractThe magnetotelluric study of the Montaña de Fuego area has been carried out by developing a complete methodology for the application of electromagnetic field analysis in an active volcanic zone. A set of resistivities has been defined for data reduction, starting from the invariants of the ten sor which relates the traniformed magnetic and electric fields and associates the anomalies which take place due to ionic conduction to resistivity of non-orthogonal components of the fields which, for the extreme case of homogeneous structure with internal sources, coincides with the resistivity designed by Cagniard. The application of this method for the purpose of determining the deep structure of the Timanfaya volcano, has facilitatedthe detection of a very conductive body (p≤1Ωm)which must relate to a shallow rnagmatic charober associated with the 173.0-36 eruptions. The nucleous of this intrusion 1s located at a depth of 4 km. and maintains temperatures in excess of 9QO°C. In adition to other more superficial discontinuities relating to local structures, the limit horizon which has been detected is a very conductive le vel, corresponding to the crust-mantle transition at a depth of 15 km.
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