Open AccessIntegrated geoelectrical and magnetotelluric exploration at Gran Sasso d'Italia range (Central Apennines)
Author(s) -
L. Alfano,
M. Giudici,
A. Zaja
Publication year - 1998
Publication title -
annals of geophysics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 60
eISSN - 2037-416X
pISSN - 1593-5213
DOI - 10.4401/ag-4348
Subject(s) - magnetotellurics , geology , resistive touchscreen , dipole , cretaceous , seismology , electrical resistivity and conductivity , geophysics , geomorphology , paleontology , physics , electrical engineering , engineering , quantum mechanics
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 ? 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 ? m