Electrical resistivity imaging in transmission between surface and underground tunnel for fault characterization

Abstract : Electrical resistivity images supply information on sub-surface structures and are classically performed to characterize faults geometry. Here we use the presence of a tunnel intersecting a regional fault to inject electrical currents between surface and the tunnel to improve the image resolution at depth. We apply an original methodology for defining the inversion parametrization based on pilot points to better deal with the heterogeneous sounding of the medium. An increased region of high spatial resolution is shown by analysis of point spread functions as well as inversion of synthetics. Such evaluations highlight the advantages of using transmission measurements by transferring a few electrodes from the main profile to increase the sounding depth. Based on the resulting image we propose a revised structure for the medium surrounding the Cernon fault supported by geological observations and muon flux measurements.
Type de document :
Article dans une revue
Journal of Applied Geophysics, Elsevier, 2016, 128, pp.163-178. 〈10.1016/j.jappgeo.2016.03.004〉
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http://hal.in2p3.fr/in2p3-01323483
Contributeur : Dominique Girod <>
Soumis le : lundi 30 mai 2016 - 15:21:43
Dernière modification le : jeudi 15 mars 2018 - 11:40:10

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N. Lesparre, A. Boyle, B. Grychtol, J. Cabrera, J. Marteau, et al.. Electrical resistivity imaging in transmission between surface and underground tunnel for fault characterization. Journal of Applied Geophysics, Elsevier, 2016, 128, pp.163-178. 〈10.1016/j.jappgeo.2016.03.004〉. 〈in2p3-01323483〉

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