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Three-dimensional Inversion of Airborne Time-domain Electromagnetic Data for Ground Sources by Myeong-Jong Yi; Soocheol Jeong; Akira Johmori; Yutaka Sasaki is a Earth and Planetary Sciences article available to read on EtoBox.

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While most airborne time-domain electromagnetic (ATEM) surveys are carried out using movingsource systems, semi-airborne systems that use a ground-based source, such as GREATEM, have gained popularity in recent years because they allow for more in-depth exploration than movingsource systems. We presented a three-dimensional inversion method for interpreting transient data collected in semi-airborne surveys. Our method is based on a Gauss-Newton minimization approach. The forward problem is solved in the frequency domain using a secondary-field finitedifference technique, and the resulting solution and sensitivity are Fourier-transformed to the time domain using a digital filter. The sensitivities are evaluated by the adjoint-equation method, except for those of a surface region immediately below the source, which are derived by forward modeling the response of a perturbed model based on finite differences. We tested our inversion method on synthetic and real data. The synthetic tests show that the resolution capability of the semi-airborne surveys is dependent on the location of the ground source, which suggests that it is desirable to employ multiple source locations and perform j

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Author

Myeong-Jong Yi; Soocheol Jeong; Akira Johmori; Yutaka Sasaki

Publisher

Informa UK Limited

Published

2023

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)