Improved Magnetotelluric Zohdy-Oldenburg Direct Inversion

Abstract EN

Based on researches of Baiyao (1995) and Zhang and Xu (2001), this paper proposes an improved 2D MT Zohdy-Oldenburg direct inversion method, in the least-square sense, embodying the features of Zohdy’s ratio method and Oldenburg’s difference method, in the condition of rugged topography, with phase information.

It bypasses large calculations of the Jacobian matrix and large sparse linear systems of equations and enables direct modifications and comparisons of the model parameters.

According to the calculation and analysis of examples, it shows faster convergence and higher precision.

In contrast with the conventional linear inversion, the calculation speed of this new method can be increased by more than 10 times.