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Within the framework of a global French program oriented towards thedevelopment of renewable energies, Martinique Island (Lesser Antilles, France)has been extensively investigated (from 2012 to 2013) through an integratedmulti-methods approach, with the aim to define precisely the potentialgeothermal ressources, previously highlighted (Sanjuan et al., 2003). Amongstthe common investigation methods deployed, we carried out three magnetotelluric(MT) surveys located above three of the most promising geothermal fields ofMartinique, namely the Anses d'Arlet, the Montagne Pel{\'e}e and the Pitons duCarbet prospects. A total of about 100 MT stations were acquired showing singleor multi-dimensional behaviors and static shift effects. After processing datawith remote reference, 3-D MT inversions of the four complex elements of MTimpedance tensor without pre-static-shift correction, have been performed foreach sector, providing three 3-D resistivity models down to about 12 to 30 kmdepth. The sea coast effect has been taken into account in the 3-D inversionthrough generation of a 3-D resistivity model including the bathymetry aroundMartinique from the coast up to a distance of 200 km. The forward response ofthe model is used to calculate coast effect coefficients that are applied tothe calculated MT response during the 3-D inversion process for comparison withthe observed data. 3-D resistivity models of each sector, which are inheritedfrom different geological history, show 3-D resistivity distribution andspecificities related to its volcanological history. In particular, thegeothermal field related to the Montagne Pel{\'e}e strato-volcano, ischaracterized by a quasi ubiquitous conductive layer and quite monotonictypical resistivity distribution making interpretation difficult in terms ofgeothermal targets. At the opposite, the resistivity distribution of Ansed'Arlet area is radically different and geothermal target is thought to beconnected to a not so deep resistive intrusion elongated along a mainstructural axis. Beside these interesting deep structures, we demonstrate,after analyzing the results of the recent heliborne TEM survey covering thewhole Martinique, that surface resistivity distribution obtained from 3-Dinversion reproduce faithfully the resistivity distribution observed by TEM. Inspite of a very different sampling scale, this comparison illustrates theability of 3-D MT inversion to take into account and reproduce static shifteffects in the sub-surface resistivity distribution.

3-D Magnetotelluric Investigations for geothermal exploration in  Martinique (Lesser Antilles). Characteristic Deep Resistivity Structures, and  Shallow Resistivity Distribution Matching Heliborne TEM Results