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Title: 3D modelling of the electromagnetic response of geophysical targets using the FDTD method

Abstract

A publicly available and maintained electromagnetic finite-difference time domain (FDTD) code has been applied to the forward modelling of the response of 1D, 2D and 3D geophysical targets to a vertical magnetic dipole excitation. The FDTD method is used to analyze target responses in the 1 MHz to 100 MHz range, where either conduction or displacement currents may have the controlling role. The response of the geophysical target to the excitation is presented as changes in the magnetic field ellipticity. The results of the FDTD code compare favorably with previously published integral equation solutions of the response of 1D targets, and FDTD models calculated with different finite-difference cell sizes are compared to find the effect of model discretization on the solution. The discretization errors, calculated as absolute error in ellipticity, are presented for the different ground geometry models considered, and are, for the most part, below 10% of the integral equation solutions. Finally, the FDTD code is used to calculate the magnetic ellipticity response of a 2D survey and a 3D sounding of complicated geophysical targets. The response of these 2D and 3D targets are too complicated to be verified with integral equation solutions, but show the proper low- andmore » high-frequency responses.« less

Authors:
 [1]
  1. Univ. of Arizona, Tucson, AZ (United States). Mining and Geological Engineering Dept.
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
277559
Resource Type:
Journal Article
Journal Name:
Geophysical Prospecting
Additional Journal Information:
Journal Volume: 44; Journal Issue: 3; Other Information: PBD: May 1996
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; 54 ENVIRONMENTAL SCIENCES; ELECTROMAGNETIC SURVEYS; DATA PROCESSING; MATHEMATICAL MODELS; SANITARY LANDFILLS; ALGORITHMS; PERFORMANCE TESTING; RESOLUTION

Citation Formats

Debroux, P S. 3D modelling of the electromagnetic response of geophysical targets using the FDTD method. United States: N. p., 1996. Web. doi:10.1111/j.1365-2478.1996.tb00157.x.
Debroux, P S. 3D modelling of the electromagnetic response of geophysical targets using the FDTD method. United States. https://doi.org/10.1111/j.1365-2478.1996.tb00157.x
Debroux, P S. 1996. "3D modelling of the electromagnetic response of geophysical targets using the FDTD method". United States. https://doi.org/10.1111/j.1365-2478.1996.tb00157.x.
@article{osti_277559,
title = {3D modelling of the electromagnetic response of geophysical targets using the FDTD method},
author = {Debroux, P S},
abstractNote = {A publicly available and maintained electromagnetic finite-difference time domain (FDTD) code has been applied to the forward modelling of the response of 1D, 2D and 3D geophysical targets to a vertical magnetic dipole excitation. The FDTD method is used to analyze target responses in the 1 MHz to 100 MHz range, where either conduction or displacement currents may have the controlling role. The response of the geophysical target to the excitation is presented as changes in the magnetic field ellipticity. The results of the FDTD code compare favorably with previously published integral equation solutions of the response of 1D targets, and FDTD models calculated with different finite-difference cell sizes are compared to find the effect of model discretization on the solution. The discretization errors, calculated as absolute error in ellipticity, are presented for the different ground geometry models considered, and are, for the most part, below 10% of the integral equation solutions. Finally, the FDTD code is used to calculate the magnetic ellipticity response of a 2D survey and a 3D sounding of complicated geophysical targets. The response of these 2D and 3D targets are too complicated to be verified with integral equation solutions, but show the proper low- and high-frequency responses.},
doi = {10.1111/j.1365-2478.1996.tb00157.x},
url = {https://www.osti.gov/biblio/277559}, journal = {Geophysical Prospecting},
number = 3,
volume = 44,
place = {United States},
year = {Wed May 01 00:00:00 EDT 1996},
month = {Wed May 01 00:00:00 EDT 1996}
}