Simulation of WEM using ELF modeling of local area and modified UPML

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 perfectly matched layer (UPML) as the absorbing boundary, then applied this model to simulate the WEM. The results of wave propagation in the underground show several wave propagation properties, which can be applied in future WEM application studies. It is noted that real-geodesic data are included to improve the practicability of the simulation results.