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Introduction
The characterization of ancient roads, such as the one connecting the old Clermont-Ferrand to the thermal settlement of Mont-Dore, can be usually performed with geophysical techniques. The frequency domain electromagnetic induction (FD-EMI) method, primarily designed to map the electrical conductivity, has proven to be a good alternative to the magnetic method in such volcanic environment as it can also sense contrasts of magnetic susceptibility while not being strongly perturbed by remanent magnetization (Simon et al., 2017 ; Guillemoteau et al., 2019). Moreover, the use of multi-frequency systems broadens the spectrum of potentially measurable properties including magnetic viscosity and dielectric permittivity (Simon et al., 2017). The GEM-2 (Geophex) is a multi-frequency FD-EMI system, which is relatively light and compact, and thereby allows medium scale mapping in...
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