Akinori Saito¹, Takeshi Sakanoi², Yuta Hozumi³, Septi Perwitasari⁴, Ryo Murakami⁵ and Ryota Okada⁵, (1)Kyoto University, Kyoto, Japan, (2)PPARC, Tohoku University, Sendai, Japan, (3)Kyoto University, Geophysics, Kyoto, Japan, (4)National Institute of Polar Research, Tachikawa, Japan, (5)Kyoto University, Department of Geophysics, Kyoto, Japan