地震に関連するFM電波伝搬異常検知のためのVHF帯干渉計システム

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): VHF Interferometry System for Detecting Anomalous Propagation of FM Radio Broadcasting Wave Related to Earthquake and its Preliminary Result

著者名: 大野　望（千葉大学大学院理学研究科），刀根　優花（千葉大学大学院理学研究科），服部　克巳（千葉大学大学院理学研究科），山本　勲（岡山理科大学院工学部），島倉　信（千葉大学大学院工学研究科），鷹野　敏明（千葉大学大学院工学研究科）

著者名(英語): Nozomi Ohno (Graduate School of Science, Chiba University), Yuka Tone (Graduate School of Science, Chiba University), Katsumi Hattori (Graduate School of Science, Chiba University), Isao Yamamoto (Faculty of Engineering, Okayama University of Science), Shin Shimakura (Graduate School of Science, Chiba University), Toshiaki Takano (Graduate School of Science, Chiba University)

キーワード: VHF帯干渉計システム，伝搬異常，FM電波，地震，到来方位　　VHF interferometer，anomalous propagation，FM radio broadcasting wave，earthquake，direction of arrival

要約(英語): Earthquake-related anomalous electromagnetic phenomena have been reported in various frequency ranges in a few decades. Investigation on the anomalous propagation of VHF transmitter waves is one of promising approaches on the short-term prediction and crustal activity monitoring. The anomalous propagation is considered to be generated by disturbances of the atmosphere above the epicenter or along the propagation path prior to large earthquakes. Consequently, over-horizontal propagation has been received. A recent study shows that the appearance of anomalies was significantly enhanced within 5 days before earthquakes with M ≥ 4.8. However, there is no information on the scattered place, that is, the direction of wave arrival. Therefore, a simple interferometer system for VHF radio wave to identify the position between space-time of earthquake-related atmospheric disturbances has been developed and installed at Chiba University. In this paper, we will show you the developed interferometer system and results of fundamental tests to evaluate the performance of developed and installed interferometer at Chiba. In addition, facts on invisible propagation of VHF radio wave obtained from 1-year continuous measurement at Chiba are described in this paper. Those are possible radio duct propagations and possible earthquake-related anomalous propagations.

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: 750-756 p

原稿種別: 論文／日本語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejfms/131/9/131_9_750/_article/-char/ja/