3:45 PM - 4:00 PM
*Tatsuya Tamura1, Tetsuya Yokoyama1, James B Gill2, Takeshi Kuritani3, Akira Ishikawa1 (1.Department of Earth and Planetary Science, School of Science, Tokyo Institute of Technology, 2.University of California, Santa Cruz, 3.Department of Earth and Planetary Sciences, Faculty of Science, Hokkaido University)