日本地球惑星科学連合2022年大会

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[E] 口頭発表

セッション記号 M (領域外・複数領域) » M-IS ジョイント

[M-IS10] Interdisciplinary studies on pre-earthquake processes

2022年5月22日(日) 15:30 〜 17:00 101 (幕張メッセ国際会議場)

コンビーナ:服部 克巳(千葉大学大学院理学研究科)、コンビーナ:劉 正彦(国立中央大学太空科学研究所)、Ouzounov Dimitar(Center of Excellence in Earth Systems Modeling & Observations (CEESMO) , Schmid College of Science & Technology Chapman University, Orange, California, USA)、コンビーナ:Huang Qinghua(Peking University)、座長:劉 正彦(国立中央大学太空科学研究所)、韓 鵬(南方科技大学)

16:15 〜 16:30

[MIS10-10] 2011年東北沖地震前の電離圏の振る舞い

*小山 孝一郎1陳 佳宏2 (1.国際宇宙天気研究・教育センター 九州大学、2.地球科学科、国立成功大学、台湾)

キーワード:地震、電離圏、地面垂直

NmF2 before large earthquakes has been studied by many scientists by picking up the deviation of NmF2 from the normal behavior. However, this is not enough to study the precursor anomaly. We need to study the daily behavior of the NmF2 as well as h’F at several stations which are located at different longitudes and geomagnetic latitudes. To add space weather parameter, such as Kp index, Dst, and F10.7 might be essential. Depending on the geomagnetic latitude especially, the NmF2 shows different behavior; at one location daytime NmF2 shows the peak, while at other location, it shows the minimum. The night time NmF2 at high latitude exceeds almost two times from the normal daily values. These behaviors is explained by the intensity of the electric field which we is considered to be the driver modifying the ionosphere. In addition to the parameters including both ionosphere the space weather, the vertical ground motion which are measured with the slant gages distributed inside Japan needs to be carefully studied. We stress here that to study both the spontaneous variation of frequency spectrum and power spectrum density (PSD) might provide the possibility to identify the location of the epicenter and the day of the earthquake