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- W2557232016 abstract "In order to confirm whether electromagnetic (EM) pulses could be excited or not when earthquakes occurred, we first began to measure electric noise in an electrically non-conductive borehole of 100 m in depth which was constructed in the campus of Kyoto Sangyo University in 1999. It was found, from the measurements, that many impulsive noises were detected even in the earth, and was expected that these impulsive noise would be generated in the earth because their intensity in the earth is stronger than those detected above the ground [1]. It is considered that these impulsive electric noises would be electric field component of EM pulses. In order to clarify the relation between locations of detected EM pulses and of earthquake occurrences, we next accomplished a sensor system for determining arrival directions of EM pulses, aiming to find their source locations. At 14:49:56 of January 6, 2004, the new system detected an EM pulse just when an earthquake occurred at off-shore of Kumano-nada, Mie-prefecture, and simultaneously displayed its arrival direction pointing toward the earthquake as shown in Fig. 1. From frequency dispersion characteristic curves derived from waveforms of the detected electric and magnetic field components of the EM pulse, we estimated its propagation distance, and found that the source location of the EM pulse was in the epicenter region of the earthquqake (see Fig.1). The result suggested that the EM pulse had first leaked out of the ground surface of the epicenter region Fig. 1 Source location of earth-origin EM pulse detected at of the earthquake and was propagating 14:49:54, Jan. 6, 2004 when the earthquake occurred. between the ionosphere and the ground The source location was in the epicenter region. 135.5E" @default.
- W2557232016 created "2016-11-30" @default.
- W2557232016 creator A5069010492 @default.
- W2557232016 date "2012-01-01" @default.
- W2557232016 modified "2023-09-27" @default.
- W2557232016 title "Detections and Confirmation of Co-seismic Electromagnetic Pulses in the Earth" @default.
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