*William F McDonough^1,2、Scott A. Wipperfurth²、Meng Guo^2,3、Ondřej Šrámek⁴ (1.Department of Earth Sciences and Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan、2.Department of Geology, University of Maryland, College Park, MD 20742, USA、3.Institute of Crustal dynamics, China Earthquake Administration, Beijing 100085, China、4.Department of Geophysics, Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic)