Abstract :
The VLF/LF receiving network is established in Japan (and also Kamchatka, Taiwan and Indonesia) composed of seven observing stations (Moshiri (Hokkaido), Chofu (UEC), Tateyama (Chiba), Shimizu, Kasugai (Nagoya) and Kochi). At each station we observe simultaneously several VLF/LF transmitter signals (Japanese JJI (40 kHz, Fukushima), JJI (Ebino, Kyusyu), and foreign VLF transmitters (NWC (Australia), NPM (Hawaii), NLK (USA). This Japanese VLF/LF network is used to study the ionospheric perturbations associated with earthquakes, and we present a few case studies (like Niigata Chuetsu earthquake, Sumatra earthquake) and statistical studies on the correlation between ionospheric perturbations (in the form of VLF/LF propagation anomaly) and earthquakes.
Keywords :
earthquakes; geophysical signal processing; ionospheric electromagnetic wave propagation; ionospheric techniques; radiowave propagation; seismology; Chofu; Japan; Kasugai; Kochi; Moshiri; Shimizu; Tateyama; earthquake prediction; earthquakes; ionospheric perturbations; subionospheric VLF/LF probing; transmitter signals; Australia; Earthquake engineering; Electromagnetic measurements; Electromagnetic scattering; Electronic mail; Ionosphere; Mechanical variables measurement; Motion measurement; Radio transmitters; Sprites (computer); VLF/LF propagation; earthquake; earthquake prediction; ionospheric perturbations;
