*Morihisa Hamada¹, Hikaru Iwamori^1,2,3, Philipp A. Brandl⁴, Takayuki Ushikubo¹, Kenji Shimizu¹, Motoo Ito¹, He Li⁵, Ivan P. Savov⁶ (1.Japan Agency for Marine-Earth Science and Technology, 2.Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 3.Earthquake Research Institute, University of Tokyo, 4.GEOMAR Helmholtz Centre for Ocean Research Kiel, 5.Institute of Oceanology, Chinese Academy of Sciences, 6.School of Earth and Environment, University of Leeds)