[P-EM36_28PO1] 大気圏・電離圏

[PEM36-P19] Observations of seismo-traveling ionospheric disturbance during the 2011 Tohoku earthquake using HF Doppler

*CHOU Min-yang¹、TSAI Ho-fang¹、LIU Jann-yenq² (1.Department of Earth Science,National Cheng-Kung University,Taiwan、2.Institute of Space Science, National Central University, Taiwan)

キーワード：STIDs, Ionosphere, earthquake, tsunami

This paper reports seismo-traveling ionospheric disturbances (STIDs) induced by the 11 March 2011 M9.0 Tohoku-oki earthquake and following pan-Pacific tsunami by two networks of HF (high-frequency) Doppler sounding systems in Japan and Taiwan. The Hilbert-Huang Transform (HHT) is applied to analyze Doppler frequency shifts (DFSs) detecting STIDs, while the time delay, circle, ray-tracing, and beam-forming methods are used to compute the propagation of the detected STIDs. Both STIDs induced by the Rayleigh waves and tsunami of the Tohoku-oki earthquake are detected and discussed.