报告时间：8月7日（周四）上午9:30 地点： 中科院计算地球动力学实验室会议室 报告人：Xiaohui Yuan 报告摘要：We present a three-dimensional model of shear wave velocity for the upper mantle of China and the surrounding region by multi-mode Rayleigh wave tomography. The procedure involves combination of 1-D path average models obtained by modeling each Rayleigh waveform up to the 4th higher mode in a tomographic inversion scheme. The seismic lithosphere, as it is defined by the crust and the high velocity mantle lid, is to the first order thin in east China and thick in the west, with a high velocity lid extending down to about 200 km depth beneath much of the Tibet-Pamir plateau. Beneath India, the thickness of the seismic lithosphere gradually increases from ~100 km in south India to more than 150 km in north India, where it underthrusts the Tibetan plateau to approximately the Jinsha River Suture. High velocity lid extending down to 100-150 km depth are also observed in the Tarim basin, Sichuan basin and Ordos block. The thickness of the lithosphere is 70-80 km or less in East China. A large-scale subhorizontal high velocity body is observed at depths of 150-400 km beneath the entire East China cratonic areas. This high velocity body might be the remnant of a delamination process which resulted in the decratonization of the North China and the Yangtze cratons. 专家简历： Dr. Xiaohui Yuan Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences Section 2.4 – Seismology Telegrafenberg 14473 Potsdam Germany Curriculum Vitae Academic Training 1999: Ph.D., Seismology, Freie Universität Berlin 1989: M.Sc., Seismology, Institute of Geophysics, Chinese Academy of Sciences 1986: B.Sc., Geophysics, University of Science and Technology of China Professional Experience 2003-present: Staff scientist, GFZ 2000-2003: Postdoc, GFZ 1996-1999: PhD student, GFZ 1994-1995: DAAD Scholar, Universität Kiel 1989-1994: Research assistant, Institute of Geophysics, Chinese Academy of Sciences, Beijing
