2D inversion of 3D cross-borehole resistivity tomography (ERT or RESTOM) data

Direct-current (DC) resistivity tomography (RESTOM1) has become a widely used and versatile geophysical imaging tool in a relatively short time. Approximately a decade ago resistivity surveys were largely limited to 1D soundings, single-spacing (depth) profiling and multi-spacing pseudo-section profiling. Advances in computer technology and electronics have made proper 2D RESTOM a reality. RESTOM differs from the above approaches in that it provides a much better resolution of subsurface resistivity features.