*Ai-ti Chen^1,2, Yuji Sano¹, Timothy B Byrne³, Naoto Takahata¹, Tsanyao Frank Yang², Yunshuen Wang⁴, Chuan-Chou Shen² (1.Univ. of Tokyo, 2.National Taiwan Univ., 3.Univ. of Connecticut, 4.Central Geological Survey)