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Shallow karst exploration using MT‐VLF and DC resistivity methods 1
Author(s) -
Guerin Roger,
Benderitter Yves
Publication year - 1995
Publication title -
geophysical prospecting
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.735
H-Index - 79
eISSN - 1365-2478
pISSN - 0016-8025
DOI - 10.1111/j.1365-2478.1995.tb00272.x
Subject(s) - electrical conduit , geology , geophysics , electrical conductor , regional geology , electrical resistivity and conductivity , karst , igneous petrology , hydrogeology , economic geology , environmental geology , gemology , mineralogy , seismology , tectonics , engineering geology , geotechnical engineering , volcanism , physics , paleontology , metamorphic petrology , quantum mechanics , telmatology , engineering , mechanical engineering
A geophysical test was carried out over a well‐located and fairly embedded karstic conduit. The MT‐VLF method was selected because of its high resolution and its ability to provide a resistivity parameter sensitive to water and Clay. This method was used together with DC resistivity methods which allow vertical adjustment of the VLF data and show consistency between the investigation and target depths. After correcting the deformations due to the polarization of the primary field, the MT‐VLF data show clearly, in the Central part of the site, that the conduit does not coincide with an anomaly axis but coincides with the boundary between a conductive area and a resistive area. 2D modelling confirms that direct detection of the conduit is not feasible and that the conduit is located close to a conductive zone corresponding to a completely Clay‐filled fractured zone. This situation was observed on the whole site and the conduit seemed systematically to thread its way between the conductive zones to join the outlet. The distribution of the conductive fractured zones and the direction of the hydraulic gradient were two important elements in predicting the location of the conduits. A 3D approach would increase the probability of finding the conduits in such a case.