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A technique to locate earthquake hypocenters using extremely low frequency (ELF) electromagnetic (EM) precursors is proposed. This technique relies on recording EM eruptions caused by underground physical mechanisms during the earthquake preparing process. Using the triangulation algorithm and the attenuation rate of EM waves in the Earth-ionosphere system, the source (usually the earthquake hypocenter)...
Anomalous electromagnetic (EM) phenomena of the ultra-low frequency (ULF) and the extremely low frequency (ELF) prior to or during earthquakes are analyzed using the geodesic finite-difference time-domain (FDTD) algorithm and accurate geological EM data. Firstly, the underground EM eruption caused by the earthquake physical process is simulated, and its effects on the surface EM field are analyzed...
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