前兆電離層擾乱に関する観測研究(第3部地殻活動に伴う電磁波放射の研究)

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Three subjects have been investigated;(1)the direction finding system for precursory radio emissions associated with earthquakes, (2)the effect of earthquakes on the propagation of low-latitude magnetospheric whistlers and (3) observational results of the electromganetic radioemissions associated with the volcanic activity of Mt. Fugen, Unzen. As for the 1st item, a new direction finding system is proposed on the basis of simultaneous measurement of three electric and three magnetic field compornents at ULF (0-10Hz) and at ELF (1.5kHz±5Hz). The waveform measurements will enable us to measure the wave impedance, wave polarization and direction of arrival. The new systems will be installed at Hasaki (Choshi) and Tsukuba, and the observation will be commenced shortly. In the second subject we firstly have found the evidence of seismic effect on the upper atmosphere. Very unusual whistlers with larger dispersions are found to occur in association with the seismic activity, and it is suggested that low-latitude magnetospheric whistlers may be a precursor to very large earthquakes. Recent observational results for the eruption of Mt. Unzen are presented, including the radio emissions associated with the pilo-crush flow and eruption of Mt. Unzen.
独立行政法人防災科学技術研究所の論文
1993-03-29

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