9:15 AM - 9:30 AM
*Satoshi TAKAHASHI1, Shin-ichi YAMASAKI2, Kazuhiro OGAWA3, Kunio KAIHO3, Noriyoshi TSUCHIYA2 (1.Department of Earth and Planetary Science, University of Tokyo, 2.Graduate School of Environmental Studies, Tohoku University,, 3.Graduate School of Science, Tohoku University)