Structure and Dynamics of Earth's Core and Lowermost Mantle

EAR 0106544（PH#50x）提案摘要标题：地核和最低地幔的结构和动力学项目负责人：宋晓东，伊利诺伊大学厄巴纳-香槟分校本提案旨在对以下有关地核和最低地幔的结构和动力学领域进行研究。(1)本研究将利用差分PKP走时测量和内核旋转与内核和下地幔精细横向结构的联合反演来约束内核旋转。这项研究还将解决确定内核旋转的不确定性，特别是事件错位的系统偏差的可能性。(2)本研究将通过模拟详细的波形和增加不同深度内岩芯的横向样品来限制内岩芯的精细结构。(3)这项研究将寻求通过使用地震岩心相位的差分走时和波形来约束最低地幔的结构，这将消除或减少上地幔非均匀性和震源不确定性带来的偏差

Abstract for proposal EAR0106544 (PH # 50x)Title: Structure and Dynamics of Earth's Core and Lowermost MantlePI's: Xiaodong Song, University of Illinois at Urbana-ChampaignThis proposal is to conduct research in the following related areas concerning the structure and dynamics of Earth's core and lowermost mantle. (1) The study will seek to constrain the inner core rotation using differential PKP travel-time measurements and joint inversion of inner core rotation and fine lateral structure of inner core and lower mantle. This study will also address uncertainties in determining inner core rotation, in particular the possibility of systematic biases from event mislocation. (2) This study will seek to constrain fine structure of the inner core by modeling of detailed waveforms and increasing lateral samples of various depths of the inner core. (3) This study will seek to constrain the structure of lowermost mantle by using differential travel times and waveforms of seismic core phases, which remove or reduce biases from upper mantle heterogeneities and source uncertainties