Seismogenic Effects in the ELF Schumann Resonance Band

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カテゴリ: 論文誌(論文単位)グループ名: 【A】基礎・材料・共通部門発行日: 2011/09/01タイトル(英語): Seismogenic Effects in the ELF Schumann Resonance Band著者名: Masashi Hayakawa (Department of Electronic Engineering and Re search Station on Seismo Electromagnetics, The University of Electro-Communications), Yasuhide Hobara (Department of Electronic Engineering and Research Station on Seismo Electromagnetics, The University of Electro-Communications), Kenji Ohta (Department of Electronic Information, Chubu University), Jun Izutsu (Research Center of Earth Watch Safety Net, Chubu University), Alexander P. Nickolaenko (Usikov Institute of Radiophysics and Engineering), Valery Sorokin (IZMIRAN)著者名(英語): Masashi Hayakawa (Department of Electronic Engineering and Research Station on Seismo Electromagnetics, The University of Electro-Communications), Yasuhide Hobara (Department of Electronic Engineering and Research Station on Seismo Electromagnetics, The University of Electro-Communications), Kenji Ohta (Department of Electronic Information, Chubu University), Jun Izutsu (Research Center of Earth Watch Safety Net, Chubu University), Alexander P. Nickolaenko (Usikov Institute of Radiophysics and Engineering), Valery Sorokin (IZMIRAN)キーワード: seismo-electromagnetics，Schumann resonance，ELF band，line emissions，earthquakes要約(英語): The purpose of this paper is to review the seismogenic effects in the ELF (extremely low frequency) Schumann resonance (SR) band. Two interesting phenomena have been recently observed in this ELF SR band. The first is the enhancement of the SR third or fourth harmonic prior to a large earthquake (EQ), and the second is the excitation of SR-like line emissions possibly related with large EQs. The first phenomenon was initially found as the enhancement of the SR fourth harmonic in Japan, in possible association with the famous 1999 Chi-chi EQ in Taiwan. This was further statistically confirmed on the basis of data during several years and was additionally confirmed by further observations at a different place in Japan. The second SR-like line emissions have been detected in Japan in possible association with two huge EQs in Japan. The frequencies of those line emissions are likely to be shifted from the conventional SR harmonics by a significant amount of 1∼2 Hz, but their temporal variation seems to suggest a close relationship with the conventional SRs. Together with the explanation of the observational evidence of those two phenomena, we provide the plausible theoretical explanation of those phenomena. The first anomaly is interpreted in terms of the wave interference due to the significant difference in propagation length between the direct signal from the American lightning source and that scattered by the seismo-ionospheric perturbations above the epicenters of EQs in Taiwan. The second phenomenon is recently interpreted in terms of the ground detection of gyrotropic waves in the ionospheric dynamo region, being excited by the seismogenic noises from below in the ELF SR band.本誌: 電気学会論文誌A（基礎・材料・共通部門誌） Vol.131 No.9 （2011） 特集：自然災害軽減のための電磁界技術本誌掲載ページ: 684-690 p原稿種別: 論文／英語電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejfms/131/9/131_9_684/_article/-char/ja/ Show more