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Flank instability structure of Mt. Etna inferred by a magnetotelluric survey (Articolo in rivista)

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Flank instability structure of Mt. Etna inferred by a magnetotelluric survey (Articolo in rivista) (literal)

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Alternative label

Siniscalchi A., Tripaldi S., Neri M., Balasco M., Romano G., Ruch J., Schiavone D. (2012)
Flank instability structure of Mt. Etna inferred by a magnetotelluric survey
in Journal of geophysical research; AGU, American geophysical union, Washington, DC (Stati Uniti d'America)
(literal)

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Siniscalchi A., Tripaldi S., Neri M., Balasco M., Romano G., Ruch J., Schiavone D. (literal)

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Dipartimento di Scienze della Terra e Geoambientali, Università di Bari, Campus Universitario, Via Orabona 4, I-70125 Bari, Italy. Istituto Nazionale di Geofisica e Vulcanologia, Piazza Roma 2, I-95123 Catania, Italy. CNR-IMAA, Istituto di Metodologie per l'Analisi Ambientale, Consiglio Nazionale Delle Ricerche, C.da S.Loja 5, Tito, I-85050 Potenza, Italy. Dipartimento di Scienze Geologiche, Università di Roma Tre, I-00146 Rome, Italy (literal)

Titolo

Flank instability structure of Mt. Etna inferred by a magnetotelluric survey (literal)

Abstract

This paper presents a magnetotelluric (MT) survey of the unstable eastern flank of Mt. Etna. We take thirty soundings along two profiles oriented in the N-S and NW-SE directions, and from these data recover two 2D resistivity models of the subsurface. Both models reveal three major layers in a resistive-conductive-resistive sequence, the deepest extending to 14km bsl. The shallow layer corresponds to the volcanic cover, and the intermediate conductive layer corresponds to underlying sediments segmented by faults. These two electrical units are cut by ~ E-W-striking faults. The third layer (basement) is interpreted as mainly pertinent to the Apennine-Maghrebian Chain associated with ~ SW-NE-striking regional faults. The detailed shapes of the resistivity profiles clearly show that the NE Rift is shallow-rooted (~0-1km bsl), thus presumably fed by lateral dikes from the central volcano conduit. The NW-SE profile suggests by a series of listric faults reaching up to 3km bsl, then becoming almost horizontal. Toward the SE, the resistive basement dramatically dips (from ~3km to ~10km bsl), in correspondence with the Timpe Fault System. Several high-conductivity zones close to the main faults suggest the presence of hydrothermal activity and fluid circulation that could enhance flank instability. Our results provide new findings about the geometry of the unstable Etna flank and its relation to faults and subsurface structures. (literal)

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