A fast and versatile algorithm for the inversion of Magnetotelluric data

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3D inversion of electromagnetic data is still a challenge for many people due to its compute-intensive nature. To overcome that problem various techniques are considered in this study. When many small techniques, that can be used to accelerate the inversion code, is used, the total inversion times can be reduced greatly. These techniques are chosen to be the deployment of the potential formulation of the Maxwell equations, the hybrid finite-difference and finite-elements numerical technique to solve the potentials formulation, the mesh decoupling technique to reduce the forward modeling mesh and the use of the GPUs in the numerical solutions. In addition to those, it is very important to find out which data type can best resolve which kind of anomaly. For that reason, every data type that exists in 3D Magnetotelluric inversion is used to invert a model. It is also investigated that if using the phase tensor data or the estimating the distortion tensor as a parameter could be better to deal with the distortion on data. In addition to those, the effectiveness of the inter-site tensor data is investigated. Furthermore, their distortion-free phase tensor data are also used in the inversion. In the end, the inter-site tensor data with multiple base stations and joint inversion of the inter-site data and single-site data (i.e, impedance, magnetic transfer function) are shown in this study.

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