Résumé
Near-surface geophysical investigation is a relevant tool to provide quantitative constraints of the nature and the geometry of shallow fault zones. The characterization of the seismic sources and slip partitioning has major implications in seismic hazard evaluation in the Himalaya area. This chapter presents high-resolution near-surface geophysical imaging results based on a joint approach, including electrical resistivity, seismic and gravity data to constrain the Topographic Frontal Thrust (TFT) geometry in south Central Bhutan. The results show that a flat and listric-ramp geometry characterizes the upper part of the TFT with high variations of dip angle. Low resistivity materials generally characterize fault zones. Hence, electrical resistivity tomography (ERT) is widely used for near-surface fault imaging. In southern Bhutan, gravity measurements were recorded along the same south–north profile as the ERT and seismic lines.