Semi-Airborne Transient Electromagnetic 3D Forward Modeling Using Equivalent Parameters on Regular Grids

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ID: 313492
2026
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Abstract
Summary The semi-airborne transient electromagnetic (TEM) method enables rapid subsurface exploration in regions with complex terrain. However, topographic effects often degrade the accuracy of inversion and imaging results, making it essential to incorporate terrain information into the forward modeling process. Conventional modeling approaches typically rely on fine discretization near terrain interfaces, which leads to high computational costs. To improve computational efficiency, we propose a novel TEM forward modeling method for undulating terrain based on equivalent parameters defined on regular grids. The proposed method eliminates the need for mesh refinement at terrain interfaces, thereby substantially reducing computational resource consumption while preserving the accuracy of three-dimensional topographic modeling. An equivalent parameters formulation for anisotropic media is derived. Furthermore, when the transmitter current is predominantly confined to the horizontal plane, the anisotropic representation reduces to an isotropic form. Numerical experiments demonstrate that the proposed method significantly reduces computational requirements while maintaining an acceptable level of accuracy.
Reference Key
openalex_W7161255109 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Weiyi Zhong, Jing Yang, Guan, Tingting Lin
Journal geophysical journal international
Year 2026
DOI
10.1093/gji/ggag178
URL
https://doi.org/10.1093/gji/ggag178
Keywords Keywords not found

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