2011年東北地方太平洋沖地震（Mw9.0）に先行する電離圏異常の時空間分布

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: 2016/05/01

タイトル(英語): Spatial and Temporal Distribution of the Pre-Seismic Ionospheric Anomaly Prior to the 2011 Off the Pacific Coast of Tohoku Earthquake (Mw9.0)

著者名: 廣岡 　伸治（千葉大学大学院理学研究科），市川　卓（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），韓　鵬（千葉大学大学院理学研究科），吉野　千恵（千葉大学大学院理学研究科），劉　正彦（國立中央大學太空科學研究所）

著者名(英語): Shinji Hirooka (Graduate School of Science, Chiba University), Takashi Ichikawa (Graduate School of Science, Chiba University), Katsumi Hattori (Graduate School of Science, Chiba University), Peng Han (Graduate School of Science, Chiba University), Chie Yoshino (Graduate School of Science, Chiba University), Jann-Yeng Liu (Graduate Institute of Space Science, National Central University)

キーワード: 東北地方太平洋沖地震，電離圏異常，電離圏総電子数，電離圏トモグラフィー　　the 2011 Off the Pacific Coast of Tohoku earthquake，ionospheric anomaly，total electron content，ionospheric tomography

要約(英語): The ionospheric anomalies possibly associated with large earthquakes have been reported by many researchers. In this paper, Total Electron Content (TEC) and tomography analyses have been applied to investigate the spatial and temporal distributions of ionospheric electron density prior to the 2011 Off the Pacific Coast of Tohoku earthquake (Mw9.0). Results show significant TEC enhancements and an interesting three dimensional structure prior to the main shock. As for temporal TEC changes, the TEC value increases 3-4 days before the earthquake remarkably, when the geomagnetic condition was relatively quiet. In addition, the abnormal TEC enhancement area in space was stalled above Japan during the period. Tomographic results show that three dimensional distribution of electron density decreases around 250 km altitude above the epicenter (peak is located just the east-region of the epicenter) and increases the mostly entire region between 300 and 400 km.

本誌: 電気学会論文誌A（基礎・材料・共通部門誌） Vol.136 No.5 （2016） 特集：電磁界を用いた自然災害軽減のための観測・予測・解析技術

本誌掲載ページ: 265-271 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/136/5/136_265/_article/-char/ja/