Assessment of Electromagnetic Frequency Sounding Problem in a Near Surface Geological Environment
Quang Hiep Vu, Meijing Li, and Keun Ho Ryu†
Database/Bioinformatics Laboratory, Chungbuk National University, 12 Gaeshindong, Heungduk-gu, Cheongju, Chungbuk 361-763, Korea
Understanding what exists and happens beneath the Earth’s surface could help human being make better decision in life and production. This paper introduces depth sounding based on artificial magnetic variation in a near-surface geological environment. We focus on solving the forward problem of electromagnetic frequency sounding. First, work on vertical geoelectric layers based on variation in electromagnetic fields is investigated based on the depth and the skin-effect. The skin-effect in the time domain is examined for when the frequency of electromagnetic field decreases, the eddy current would penetrates deep into the environment. Based on this background, we construct a model for solving the frequency electromagnetic sounding problem. This model allows us to detect changes in conductivity related to the Earth’s shell depth versus electromagnetic measurement at one place on the Earth’s surface. A simulation tool is then implemented using MATLAB. This model is expected to contribute especially to teaching in the field of geophysics and to be applied widely in areas such as geological map drawing, structural study, and engineering geology and hydrogeology.
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