2D MAGNETOTELLURIC MODELLING OF EARTH USING EXPONENTIAL FINITE DIFFERENCE METHOD

Abstract

This dissertation presents an efficient forward modelling algorithm MT 2D_EFDM based on. Exponential Finite Difference Method (EFDM) for simulation of magnetotelluric response of 2D earth as a modification of Classical Finite Difference Method (CFDM). EFDM employs exponential basis functions whose exponent parameter μ must be chosen judiciously to obtain optimum results. The near optimal values of μ can be constructed using model parameters. Since the electromagnetic response has oscillatory behaviour, EFDM handles it better and gives more accurate results in comparison to the CFDM for a given grid. Alternatively, using EFDM we can choose coarser grids to obtain same accuracy of result as CFDM provides with a given finer grid. As a result EFDM reduces the time and cost of computation in comparison to CFDM