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Authors: Alfano, L.* 
Giudici, M.* 
Zaja, A.* 
Title: Integrated geoelectrical and magnetotelluric exploration at Gran Sasso d'Italia range (Central Apennines)
Issue Date: Aug-1998
Series/Report no.: 3/41 (1998)
Keywords: Magnetotelluric
dipole-dipole DC sounding
crustal exploration
Central Apennines
Subject Classification04. Solid Earth::04.02. Exploration geophysics::04.02.04. Magnetic and electrical methods 
Abstract: We carried out three electrical soundings, with continuous polar dipole-dipole array, and three magnetotelluric stations at Gran Sasso d'Italia, in the area of Campo Imperatore. Geoelectrical data show the existence of a resistive background with exceptionally high values of resistivity (greater than 25000 Ω • m) at a depth of about 250 m. The magnetotelluric data were used to constrain the thickness of this resistive layer, below which we find an intermediate conductive structure and a deeper resistive background. The geological interpretation of this result is still open to discussion, but we can exclude that the shallow resistive layer consists of Cretaceous limestones, since their resistivity has been estimated to be about 5000 Ω • m.
Appears in Collections:Annals of Geophysics

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