〇Kiwamu NISHIDA¹, Ryota TAKAGI² (1.Earthquake Research Institute, The University of Tokyo, 2.Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, Tohoku University)

〇Tomoya TAKANO¹, Kiwamu NISHIDA² (1.Graduate School of Science and Technology, Hirosaki University, 2.Earthquake Research Institute, University of Tokyo)

〇Yoshio MURAI¹, Evgeny A. Podolskiy², Naoya Kanna³, Shin Sugiyama^4,2 (1.Faculty of Science, Hokkaido Univ., 2.Arctic Research Center, Hokkaido Univ., 3.Atmosphere and Ocean Research Institute, Univ. of Tokyo, 4.Institute of Low Temperature Science, Hokkaido Univ.)