Three-Dimensional High Resolution Upper Mantle Shear Wave Velocity Structure

本研究将建立一种新的全球上地幔三维横波速度模型，其横向分辨率为1000 km或以下。该项目的新方面是，它将从根本上改变使用很少或不使用先验信息的方法，这种方法是最近所有地震层析研究的基础。为了更好地解释浅层岩石圈速度非均质性的压倒性影响，将在一些反演中使用分区化的初始模型，包括地形、地壳和岩石圈的变化。反演工作将包括利用洛夫波和瑞利波频谱数据同时确定震源位置和结构。该项目将促进板块构造学、地幔动力学和大地水准面、岩石圈岩石学和地球化学等多学科研究的进展。

This research will develop a new global three-dimensional S- wave velocity model for the upper mantle with lateral resolution of on the order of 1000 km or less. The new aspect of this project is that it will depart fundamentally from the approach of using little or no a priori information which underlies all recent seismological tomographic studies. To better account for the overwhelming influence of shallow lithospheric velocity heterogeneity, a regionalized initial model, including topographic, crustal and lithosphere variations will be used in some of the inversion. The inversions will include simultaneous determination of source locations and structure using Love and Rayleigh wave spectral data. This project will promote multi-disciplinary advances in the study of plate tectonics, mantle dynamics and the geoid, and petrology and geochemistry of the lithosphere.