Three-dimensional magnetotelluric regularized inversion based on smoothness-constrained model
(1. School of Geosciences and Info-physics, Central South University, Changsha 410083, China;
2. Key Laboratory of Nonferrous Resource and Geological Hazard Detection of Hunan Province,
Central South University, Changsha 410083, China)
2. Key Laboratory of Nonferrous Resource and Geological Hazard Detection of Hunan Province,
Central South University, Changsha 410083, China)
Abstract: How to get the rapid and stable inversion results and reconstruct the clear subsurface resistivity structures is a focus problem in current magnetotelluric inversion. A stable solution of an ill-posed inverse problem was obtained by the regularization methods in which some desired structures were imposed to stabilize the inverse problem. By the smoothness-constrained model and approximate sensitivity method, the stable subsurface resistivity structures were reconstructed. The synthetic examples show that the smoothness-constrained regularized inversion method is effective and can be reasonable to reconstruct three-dimensional subsurface resistivity structures.
Key words: magnetotelluric; regularized inversion; approximate sensitivity; smoothness-constrained model