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ORIGINAL RESEARCH article

Front. Earth Sci.
Sec. Solid Earth Geophysics
Volume 12 - 2024 | doi: 10.3389/feart.2024.1511153
This article is part of the Research Topic Advances in Magnetotelluric Imaging View all 5 articles

Divergence correction for three-dimensional Magnetotelluric forward modelling with arbitrary electrical anisotropy

Provisionally accepted
Guo Yu Guo Yu 1Jing Han Jing Han 2*
  • 1 College of Geophysics and Petroleum Resources, Yangtze Unversity, Wuhan, China
  • 2 School of Geosciences, Yangtze University, Wuhan, China

The final, formatted version of the article will be published soon.

    This paper presents an enhanced framework for three-dimensional (3D) magnetotelluric (MT) forward modeling that incorporates a current density divergence correction procedure for arbitrary anisotropic conditions. The method accelerates the convergence of iterative solvers in solving forward equations in anisotropic media. The divergence correction is adapted from techniques initially developed for isotropic MT modeling. Through four numerical examples-a 1D anisotropic model, a 2D anisotropic model with an infinite lateral fault overlying perfect conductor, a 2D anisotropic model with upper and lower structure and a challenging 3D anisotropic model with random parameters-the validity and efficiency of the proposed approach are demonstrated. The results show that the incorporation of divergence correction significantly reduces the number of iterations required for convergence, improving computational performance and stability. The framework proves robust even in demanding scenarios involving long periods and complex anisotropic structures.

    Keywords: Magnetotelluncs, Electrical anisotrophy, Three-dimentional forward, finite difference, Divergence correction

    Received: 14 Oct 2024; Accepted: 13 Dec 2024.

    Copyright: © 2024 Yu and Han. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

    * Correspondence: Jing Han, School of Geosciences, Yangtze University, Wuhan, China

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