A Study on Parallel Computation Based on Forward Modeling and Inversion Algorithm of 2D Magnetotelluric

Magneto telluric sounding method based on the difference of the rock's resistivity is an exploration method about doing research in earth's resistivity and phase using the native electromagnetic field. The paper introduces the inversion algorithm of 2D magneto telluric named conjugate gradient method. The method, which avoids solving the jacobi matrix, is very effective, but the method is not effective enough when the model is divided into big grid. When the frequency changes, program solves relevant equation separately. According to the feature of the algorithm, we apply MPI parallel method in the algorithm. Every process solves relevant equation. The account of frequency that a process needs to solve in parallel computation is less than the account that the process needs to solve in serial algorithm. We can see that the inversion figure shows the position of the target correctly and proves the correctness of algorithm. We do statistics about the efficiency of the parallel algorithm. When the account of processes is from 2 to 8, the speedup is from 1.63 to 2.64. It proves the effectiveness of the parallel algorithm.