Abstract
The paper describes the apparent changes of the depth of the conducting asthenosphere caused by different EM field distortions beneath the 7 km deep narrow 3-D Békés graben (extensional basin) along the Pannonian Geotraverse. The real depth of the asthenosphere is approximated first by 1-D inversion and 2-D modelling techniques to show their value in case of 3-D structure. Then, 3-D thin sheet model computations-together with references to the previous theoretical modelling results-are used to select sites and curve orientation where the least distorted depth estimation is expected along a 2-D profile in case of 3-D structure. Of course, preliminary geological-tectonical information (e.g. basin contour) is needed to find the most probable asthenospheric depth.
