%0 Journal Article %A WAESELYNCK, M. %T MAGNETOTELLURIGS: PRINCIPLE AND OUTLINE OF THE RECORDING TECHNIQUE A CASE HISTORY * %D 1974 %J Geophysical Prospecting, %V 22 %N 1 %P 107-121 %@ 1365-2478 %R https://doi.org/10.1111/j.1365-2478.1974.tb00068.x %I European Association of Geoscientists & Engineers, %X Abstract First, we review briefly the principle of the method, the computation of theoretical curves for a layered earth, and the recording technique in use in our surveys. The case history deals with an area covered with overthrust nappes (marls of Miocene age), which had slid on a Triassic sole, obscuring the geological picture. The magnetotelluric survey followed those of gravity and aeromagnetics and preceded the seismic one from North to South, it displayed a shallow and gently dipping basin, a major fault system, and a deep basin with a thick resistive layer, often underlying a conducting one. The seismics, and later the drilling of a well East of the profile, confirmed these features; in particular, the thick resistive layer was revealed to be Jurassic; only its thickness had been slightly overestimated. This fact lead the people in charge of the operations to ask for a reinterpretation synthesis of magnetotellurics, seismics and gravity, the results of which are also presented. %U https://www.earthdoc.org/content/journals/10.1111/j.1365-2478.1974.tb00068.x