Seismological study of the composition of the Earth's outer core and the topography of CMB

揭示地球外核的组成和地核-地幔边界（CMB）的地形对了解地核的形成和演化、地球磁场的机制和地球自转具有重要意义。本研究试图对CMB的化学成分，特别是外核的轻元素组成、成分分层结构的存在与否以及小尺度地形提出新的地震学约束。外层核的最外层和最下层都在寻找组成层状结构。为此编制和分析了地震阵列数据，并开发了分析方法。

Revealing the composition of the Earth's outer core and the topography of the core-mantle boundary (CMB) is fundamentally important in understanding the formation and evolution of the core, the mechanism of Earth's magnetic field, and the Earth's rotation. This study attempts to put new seismological constraints on the chemical composition, particularly of light elements of the outer core, existence or absence of compositional stratified structure, and the small scale topography of the CMB. Compositionally stratified structures are sought both for the outermost and lowermost of the outer core. Seismic array data are compiled and analyzed for these purposes, and the methods for the analyses are developed.