Physics
Scientific paper
Oct 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3220303t&link_type=abstract
Geophysical Research Letters, Volume 32, Issue 20, CiteID L20303
Physics
4
Electromagnetics: Wave Propagation (2487, 3285, 4275, 4455, 6934), Physical Properties Of Rocks: Magnetic And Electrical Properties (0925), Radio Science: Electromagnetic Noise And Interference, Seismology: Earthquake Interaction, Forecasting, And Prediction (1217, 1242)
Scientific paper
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.
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