Analysis of the Shallow Structures of Active Fault Zones Using 3D Radiomagnetotelluric Data Set

A radiomagnetotelluric (RMT) is an extension of the very low frequency (VLF) Electromagnetic induction method (10-30 kHz) to frequencies as high as 1 MHz. The field data set of RMT acquired in scalar mode has been successfully analysed shallow fault structure using a 3D modeling scheme with finite difference algorithm. Due to complex geological structure in the research study area, it is difficult to fulfil the 2D assumption regarding Transverse Magnetic (TM) and Transverse Electric (TE) Modes. Hence, the 3D modeling can provide adequate information on the active fault structure and gives a representative model for all conductivity structures. The 3D model is constructed using 2D conductivity model and the geology as priori information. The resulting model clearly detects the shallow fault structure and the 3D model response is in a good agreement with 2D models from observed data.