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  1. 防災科研関係論文

Experiments to locate sources of earthquake-related VLF electromagnetic signals

https://nied-repo.bosai.go.jp/records/5570
https://nied-repo.bosai.go.jp/records/5570
45b34c7a-10e1-44fe-9c06-84246d51a1dd
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル Experiments to locate sources of earthquake-related VLF electromagnetic signals
著者 Yukio Fujinawa

× Yukio Fujinawa

en Yukio Fujinawa

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Kozo Takahashi

× Kozo Takahashi

en Kozo Takahashi

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Takumi Matsumoto

× Takumi Matsumoto

en Takumi Matsumoto

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Noriaki Kawakami

× Noriaki Kawakami

en Noriaki Kawakami

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抄録
内容記述タイプ Other
内容記述 Very low frequency (VLF) band electromagnetic signals1)-11) seem to be one of the most plausible precursory phenomena in the various kinds of anomalous electric, magnetic and electromagnetic field changes preceding earthquakes. In particular the number of VLF pulse-like signals has been known to increase clearly just before earthquakes2),4),9),10) possibly providing data on the occurrence time of impending earthquake. However, there is a lack of knowledge as to how to predict where the earthquake will strike. Also, it is difficult to establish the mechanisms of emissions induced by natural geophysical activity: earthquakes and volcanic eruptions. There are two main hypotheses regarding the generation mechanism of the VLF waves: the first proposes that electromagnetic waves are directly emitted from the hypocentral region,4),10),12)-15) while the second proposes that the emission is a result of electric charge redistribution in the Earth's atmosphere.16)-18) Here, we present source region data for VLF pulse-like signals showing that the VLF emission does not originate around the epicenter but from regions of atmosphere above the epicenter spreading horizontally in several hundreds kilometers. Our data suggest that the VLF emission is produced by the electromagnetic processes in the Earth's atmosphere up to the ionosphere.
言語 en
書誌情報 en : Proceedings of the Japan Academy Series B: Physical and Biological Sciences

巻 73, 号 3, p. 33-38, 発行日 1997-03
ISSN
収録物識別子タイプ ISSN
収録物識別子 0386-2208
DOI
関連識別子 10.2183/pjab.73.33
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