Three-dimensional resistivity structure in MCT zone around Chamoli region, Garhwal Himalaya and its seismogenic implication

Abstract Broadband Magnetotelluric (MT) data were recorded at 28 sites in and around Chamoli region of Uttarakhand, India. This dataset was processed and inverted to image the subsurface electrical resistivity of the region and to study its correlation with the seismic velocity model. The dimensionality analysis of the MT data reveals a complex strike direction hinting at the general 3D nature of the impedance tensor. Hence, 3D inversion of MT data was performed using the code ‘AP3DMT’. The final 3D resistivity model was obtained after several 3D inversion experiments. The inverted resistivity model shows broad intra-crustal low resistivity (