Experiments in Imaging Core-Mantle Boundary Scatterers Using Global Seismic Data

本研究的目的是分析全球核内地震相位PKP（DF）短周期前兆的网络记录，以检验在核幔边界（CMB）或附近直接成像小散射体的可行性。人们期望为地壳散射问题开发的迁移技术可以用来将自由表面的前驱能量反向投射到宇宙微波背景中。目标是确定我们有足够分辨率成像小规模CMB散射体的区域，并区分核心入口点和出口点结构。在综合实验之后，将对全球地震台网所有可用的短周期和宽带数据中的PKP（DF）前兆进行综合分析。这项研究是地球深层内部合作研究计划的一个组成部分。＊＊＊

9507994 HEDLIN This research is to analyze global network recordings of short- period precursors to the inner-core seismic phase PKP(DF) in order to test the feasibility of directly imaging small scatterers at or near the core-mantle boundary (CMB). The expectation is that migration techniques developed for crustal scattering problems can be used to back-project precursor energy from the free-surface to the CMB. A goal is to identify areas in which we have sufficient resolution to image small-scale CMB scatterers and to discriminate between core entry and exit point structure. Following synthetic experiments, a comprehensive analysis will be done of PKP(DF) precursors in all available short-period and broadband data from the global seismic networks. This research is a component of the Cooperative Studies of the Earth's Deep Interior program. ***