Direct and Inverse TDEM Method for Near Subsurface Resistivity Imaging

We investigate the applicability of TDEM technology for near subsurface mapping. In the direct method, we use time domain response of a multi-layered earth to a dipole excitation based on Fréchet derivatives. Expected sensitivity of detection of a low-conducting layer is analyzed for various ground conductivities and layer depth. Our inversion method is based on Marquard technique and gives 1-D conductivity depth profile for each time sequence measurement.