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

利用全球地震数据对核幔边界散射体成像的实验

• 批准号: 9507994
• 负责人: Michael Hedlin
• 金额: $ 4.75万
• 依托单位: University of California-San Diego
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-07-15 至 1997-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9507994&HistoricalAwards=false
• 关键词: Experiments; Imaging; Core; Mantle; Boundary

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. ***

小行星9507994 本研究分析了全球网络记录的内核地震相PKP（DF）的短周期前兆，以测试直接成像核幔边界（CMB）处或附近的小散射体的可行性。 期望的是，迁移技术开发的地壳散射问题，可以用来从自由表面的CMB的前体能量后向投影。 一个目标是确定我们有足够的分辨率来成像小规模的CMB散射体和区分核心的入口和出口点结构的区域。 在综合实验之后，将对全球地震台网所有现有短周期和宽频带数据中的PKP（DF）前兆进行全面分析。 这项研究是地球深层内部合作研究计划的一个组成部分。 ***