Title :
Study on locating simulation of EM radiation source and transfer characteristic in ELF electromagnetic field
Author :
Yasukawa, Hiroshi
Abstract :
The Japanese Islands are located in an active position of seismic activity and therefore often have been afflicted by the damage of an earthquake. There is a report that disorder of an electro-magnetic (EM) wave occurs in nature as a precursor of crustal activity. In order to detect the sign, we have been measuring EM waves of 223 Hz at about 40 sites in Japan. Our final goal is to determine the EM source more correctly. To locate the radiation source by multi point observations of EM power, EM wave propagation characteristic needs to be clear. In the presumed method of a generation source, we assume the attenuation model that EM wave intensity declines by the α power of the distance from the EM source. α is an unknown value, however, this paper analyzes α by locating the thundercloud position which generates the EM wave.
Keywords :
Earth crust; clouds; earthquakes; electromagnetic field theory; geophysical signal processing; geophysical techniques; lightning; radiowave propagation; seismic waves; thunderstorms; 223 Hz; ELF electromagnetic field; EM power; EM radiation source; EM wave generation; EM wave intensity; EM wave propagation; Japanese Islands; attenuation model; crust activity; earthquake; electromagnetic wave distortion; seismic activity; signal detection; thunder-cloud position; transfer characteristics; Antenna measurements; Attenuation; Earthquakes; Electromagnetic fields; Electromagnetic radiation; Geophysical measurement techniques; Ground penetrating radar; Magnetic field measurement; Power generation; Telephony;
Conference_Titel :
Geoscience and Remote Sensing Symposium, 2003. IGARSS '03. Proceedings. 2003 IEEE International
Print_ISBN :
0-7803-7929-2
DOI :
10.1109/IGARSS.2003.1295440