Schmutz M. auteur aut IRD Andrieux P. auteur aut IRD Bobachev A. auteur aut IRD Montoroi Jean-Pierre auteur aut IRD Nasri S. auteur aut IRD text journalArticle eng text/pdf born digital access Azimuthal Resistivity Soundings (ARS), using the so-called "Arrow-type array" as proposed by Bolshakov et al. were carried out in Central Tunisia, together with azimuthal resistivity tomography, because of the known anisotropic behaviour of the nearly vertical formations. First, the developments designed by Bolshakov et al. are reviewed: they deal with the separation between the effects of anisotropy and of heterogeneities, the design of the Arrow-type array and the introduction of the azimuthal spectral analysis. Second, the main methodological results obtained near Gouazine Lake are presented: (1) the clear effect of a quasi-vertical contact and (2) the characterisation of the anisotropic substratum below a thin superficial layer in one site close to the axis of the valley: the strike direction (alpha = 50 degrees N), and a rather high anisotropy coefficient (lambda approximate to 4) are determined. And lastly two directions for further developments are suggested. (C) 2006 Elsevier B.V. All rights reserved. specialized ARS azimuthal resistivity sounding anisotropy Tunisia direct current 066 60 3-4 213-224 2006 0926-9851 https://www.documentation.ird.fr/hor/fdi:010037874 10.1016/j.jappgeo.2006.05.003 0926-9851 [F A010037874] https://www.documentation.ird.fr/hor/fdi:010037874 https://www.documentation.ird.fr/intranet/publi/2007/04/010037874.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2007-04-27 2017-08-23 fdi:010037874 fre