Potential of electrical resistivity tomography to detect fault zones in limestone and argillaceous formations in the experimental platform of Tournemire, France

Détails

ID Serval
serval:BIB_FF6A754C9AA3
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Potential of electrical resistivity tomography to detect fault zones in limestone and argillaceous formations in the experimental platform of Tournemire, France
Périodique
Pure and Applied Geophysics
Auteur(s)
Gélis C., Revil A., Cushing M.E, Jougnot D., Lemeille F., Cabrera J., De Hoyos A., Rocher M.
ISSN-L
0033-4553
Statut éditorial
Publié
Date de publication
2010
Peer-reviewed
Oui
Volume
167
Pages
1405-1418
Langue
anglais
Résumé
The Experimental platform of Tournemire (Aveyron, France) developed
by IRSN (French Institute for Radiological Protection and Nuclear
Safety) is located in a tunnel excavated in a clay-rock formation
interbedded between two limestone formations. A well-identified regional
fault crosscuts this subhorizontal sedimentary succession, and a
subvertical secondary fault zone is intercepted in the clay-rock
by drifts and boreholes in the tunnel at a depth of about 250 m.
A 2D electrical resistivity survey was carried out along a 2.5 km
baseline, and a takeout of 40 m was used to assess the potential
of this method to detect faults from the ground surface. In the 300
m-thick zone investigated by the survey, electrical resistivity images
reveal several subvertical low-resistivity discontinuities. One of
these discontinuities corresponds to the position of the Cernon fault,
a major regional fault. One of the subvertical conductive discontinuities
crossing the upper limestone formation is consistent with the prolongation
towards the ground surface of the secondary fault zone identified
in the clay-rock formation from the tunnel. Moreover, this secondary
fault zone corresponds to the upward prolongation of a subvertical
fault identified in the lower limestone using a 3D high-resolution
seismic reflection survey. This type of large-scale electrical resistivity
survey is therefore a useful tool for identifying faults in superficial
layers from the ground surface and is complementary to 3D seismic
reflection surveys.
Mots-clé
Electrical resistivity tomography, clay-rock, fault
Création de la notice
25/11/2013 19:00
Dernière modification de la notice
20/08/2019 16:29
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