Advanced Wireless Communications Research Center;
University of Electro-Communications (UEC);
Tokyo;
Japan;
Hayakawa Institute of Seismo Electromagnetics;
Co. Ltd.;
UEC Incubation Centre;
Tokyo;
Japan;
Institute of Physics of the Earth;
Russian Academy of Sciences;
Moscow;
Russia;
nstitute of Physics of the Earth;
Russian Academy of Sciences;
Moscow;
Russia;
VLF/LF; Subionospheric; Propagation; Ionospheric; Perturbation; Earthquake; precursors; Earthquake; Prediction;