Deep layered structure investigation with multielectrode methods

Direct current geoelectrical measurements since several decades are used to investigate geological structures. With the rapid development of computer hard- and software and the advances made in the field of the measurment technology, multielectrode measurements have for many applications replaced the conventional four electrode equipment. 2D and 3D inversion software allows to invert large data sets. But, while lateral structures are usually well resolved, the interpretation of data sets over rather horizontally layered structures often fails-even falling back behind the achievements of a 1D investigation.