Work

Stable Calculation of Responses for a Plane Electromagnetic Wave in an Anisotropic Layered Media for the Modeling of Magnetotelluric Data

Year: 2024

Type: article

Abstract: Research in multi-dimensional magnetotelluric (MT) modeling and inversion, particularly within anisotropic media, is gaining substantial interest.One-dimensional (1-D) modeling is utilized as boundary conditions necessary for accurate 2-D or 3-D anisotropic modeling.Based on Maxwell's equations and interface boundary conditions, we developed a new algorithm to calculate electromagnetic fields for both 1-D isotropic and anisotropic layered models.However, this algorithm encounters stability issues at considerable depths or within exceptionally thick layers.To address these challenges, we introduced two stabilization strategies.The first strategy alters the exponential terms in the plane-wave solutions to mitigate instabilities, while the second evaluates each layer's contribution to numerical instability, replacing problematic thick layers with an infinite half-space.Through numerical tests on a four-layer anisotropic model, these strategies proved effective, ensuring stable computations of electromagnetic fields at any depth and in configurations with thick layers, thereby enhancing the model's applicability for in-depth anisotropic analyses.

Source: Journal of the Korean Society of Mineral and Energy Resources Engineers

DOI: 10.32390/ksmer.2024.61.4.284

Authors: Hee June Lee, Janghwan Uhm, Junyeong Heo, Dong-Joo Min

Institutions: Seoul National University, Korea Institute of Geoscience and Mineral Resources

Language: English

Topic: Geophysical and Geoelectrical Methods

Subfield: Geophysics

Field: Earth and Planetary Sciences

Domain: Physical Sciences

Open Access status: diamond

Funders: Institute for Korea Spent Nuclear Fuel, Ministry of Trade, Industry and Energy, Korea Institute of Energy Technology Evaluation and Planning

Awards: G1704903968, G4874763608, G7179416701