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The wireless electromagnetic method (WEM) is an electromagnetic detection technology using extremely low frequency wave to detect underground resources and predict earthquakes. This paper studied the propagation of extremely low frequency (ELF) electromagnetic (EM) wave in real-geographic space. We used modified finite difference timedomain (FDTD) method to model part of the Earth and modified uniaxial...
A quasi three-dimensional (3D) subgrid technique for the geodesic finite-difference time-domain (FDTD) algorithm is proposed to increase local resolution level for solving extremely low frequency (ELF) electromagnetic wave propagation problems in the Earth-ionosphere system. Basic idea of this technique is to first split the spherical triangular grid into smaller grids and then split the corresponding...
The spatial stability is analyzed for the geodesic finite-difference time domain (FDTD) method. The analysis is based on the finite integration technique (FIT) and tensor analysis. After rigorous theoretical analysis, we point out that the present geodesic FDTD method can provide approximate but long-time stable solutions to the extremely low-frequency (ELF) electromagnetic wave propagation problems...
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