日本地球惑星科学連合2018年大会

講演情報

[JJ] Eveningポスター発表

セッション記号 M (領域外・複数領域) » M-IS ジョイント

[M-IS09] 地震・火山等の地殻活動に伴う地圏・大気圏・電離圏電磁現象

2018年5月22日(火) 17:15 〜 18:30 ポスター会場 (幕張メッセ国際展示場 7ホール)

コンビーナ:児玉 哲哉(宇宙航空研究開発機構研究開発部門第一研究ユニット)、長尾 年恭(東海大学海洋研究所)、芳原 容英(電気通信大学 大学院情報理工学研究科)

[MIS09-P03] Study of anomalous behaviors of geomagnetic diurnal variations prior to earthquake

*白 旻基1吉川 顕正1 (1.九州大学)

キーワード:地磁気日変化、地震地磁気現象、熊本地震

For short-term earthquake forecasting, the seismo-electromagnetic phenomena have been considered as one of the most promising analysis for several decades. In this study, we have investigated pre-seismic ionospheric disturbances by using the geomagnetic diurnal variations in the vertical component, following Xu et al.(2013).
To validate the result of Xu et al.(2013), we investigated the geomagnetic data associated with the Kumamoto earthquake(2016) and Fukushima earthquake(2016). Geomagnetic data of two observations in Kyushu area have been analyzed using the same method in Xu et al.(2013). Ratios of diurnal variation range between the target station Kuju (KUJ) which is about 55km from the epicenter and the remote reference station Kanoya (KNY) about 150km distant to the epicenter have been computed. The ratios of diurnal variation range between KAK and ESA indicated several of anomalies because of continuing earthquakes during years. Therefore we also have investigated the geomagnetic data associated with the Toyama area, where earthquakes rarely occur, to compare with where earthquakes occurred frequently such as the Fukushima area.