11:45 AM - 12:00 PM
*Keiji Tanaka1, Makoto Nagasawa2, Masato Tanaka3, Akiko Yamaguchi2, Yoshio Takahashi2 (1.The University of Tokyo, 2.Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, 3.Graduate School of Science, The University of Tokyo)