電離圏トモグラフィーによる2007年南スマトラ地震に先行する電離圏異常の3次元構造解析の試み

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): Development of Ionospheric Tomography using Neural Network and its Application to the 2007 Southern Sumatra Earthquake

著者名: 廣岡　伸治（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），西橋　政秀（気象研究所），紺　晋平（千葉大学大学院理学研究科），竹田　辰興（電気通信大学）

著者名(英語): Shinji Hirooka (Graduate School of Science, Chiba University), Katsumi Hattori (Graduate School of Science, Chiba University), Masahide Nishihashi (Meteorological Reserch Institute), Shinpei Kon (Graduate School of Science, Chiba University), Tatsuoki Takeda (The University of Electro Communications)

キーワード: 2007年南スマトラ地震，電離圏トモグラフィー，ニューラルネットワーク，GPS，TEC，GIM the 2007 Southern Sumatra earthquake，ionospheric tomography，neural network，GPS，TEC，GIM

要約(英語): The ionospheric anomaly prior to the 2007 SouthernSumatra earthquake (M8.5) was observed by GPS receivers around Sumatra islands. In this paper, to investigate the three-dimensional structure of electron density in Ionosphere, a tomographic approach (Residual Minimization Training Neural Network; RMTNN) has been performed. The results of the tomographic approach are consistent with those of total electron content (TEC) approaches. We found that the significant decreases take place in the heights of 250-400 km, especially at 330 km height. But the height which gives the maximum electron density is not changed. The obtained structure is that the decreased region exists in the southwest side of Integrated Electron Content (IEC) (400-550 km altitudes) and in the northern side of IEC (250-400 km altitudes). Global tendency of the decreases area is expanded to the east with an altitude and it is concentrated in the southern hemisphere of over the epicenter. These resultsshow that the high capability of RMTNN method for the estimation of the ionospheric electron density distribution possibly associated with earthquake.

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: 691-697 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_691/_article/-char/ja/