Identification of earthquake epicenter from measurements of electromagnetic pulses in the Earth

[1] We have developed a system for finding arrival directions of electromagnetic (EM) pulses detected in the earth. The system detected an intense EM pulse just when an earthquake (M5.5) occurred. In the analysis of the detected EM pulse, we first derived its frequency dispersion characteristics. Using the data of the dispersion characteristics, we obtained frequency-dependent arrival directions of the EM pulse. Among them, an exact direction pointing toward the EM pulse source was determined. Finally, we could find the source location of the EM pulse from the estimation of its propagation distance of a waveguide mode, which has shown that the EM pulse source location was on the earthquake epicenter.

[1]  Y. Fujinawa,et al.  Emission of electromagnetic radiation preceding the Ito seismic swarm of 1989 , 1990, Nature.

[2]  Michiko Yamashita,et al.  Propagation of tweek atmospherics , 1978 .

[3]  Kozo Takahashi,et al.  Tomography of seismo-radio wave source regions for predicting imminent earthquakes , 1989 .

[4]  Climate forcing by the volcanic eruption of Mount Pinatubo , 2005, physics/0509166.

[5]  M. Tsutsui.  Detection of earth‐origin electric pulses , 2002 .

[6]  Y. Fujinawa,et al.  Experiments to Locate Sources of Earthquake-related VLF Electromagnetic Signals , 1997 .

[7]  T. R. Meyer,et al.  Radio emission associated with rock fracture: Possible application to the Great Chilean Earthquake of May 22, 1960 , 1982 .

[8]  M. Gokhberg,et al.  Experimental measurement of electromagnetic emissions possibly related to earthquakes in Japan , 1982 .

[9]  R. Barr.  Multimode Propagation in the Earth-Ionosphere Waveguide , 1974 .

[10]  H. A. Wheeler,et al.  Radio-wave propagation in the earth's crust , 1961 .

[11]  W. Daily,et al.  Evidence of electro-seismic phenomena , 1989 .

[12]  Panayiotis A. Varotsos,et al.  Physical properties of the variations of the electric field of the earth preceding earthquakes, I , 1984 .

[13]  K. Maeda.  Mid-Latitude Electron Density Profile as Revealed by Rocket Experiments , 1969 .

[14]  N. Nikiforova,et al.  Studies of electromagnetic emission of seismotectonic origin in the Kirghiz S.S.R. , 1989 .

[15]  Dispersion characteristics and waveform analysis of tweek atmospherics , 1991 .