Analysis of Small-Scale Scattering In the Mantle Using 3-Component Network and Array Recordings of PKP Precursors and Coda

使用 PKP 前体和尾声的 3 分量网络和阵列记录分析地幔中的小尺度散射

• 批准号: 9909337
• 负责人: Michael Hedlin
• 金额: $ 12.43万
• 依托单位: University of California-San Diego Scripps Inst of Oceanography
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-12-15 至 2004-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9909337&HistoricalAwards=false
• 关键词: Analysis; Small; Scale; Scattering; Mantle

This project proposes to study small scale scattering in the mantle using 3-component network and array recordings of PKP precursors and coda. Limitations of previous work using only vertical component global seismic network data are that rapid variations in scattering strength exist and in some regions, where energetic precursors are recorded without crossing paths, it is not possible to distinguish between near-source and near-receiver scattering. This project will analyze the slowness of precursors, as well as their temporal variations, using 3-component global and regional network data to reduce the source-receiver ambiguity problem. The study will analyze broad aperture array data to produce high resolution regional images of scattering strength. The project will also use PKP coda arrivals, which sample a thicker section of the mantle than is sampled by precursors, to examine small-scale scattering more than 1000 km above the CMB.

本计画拟利用三分量网络及阵列记录PKP前兆及尾波，研究地幔中的小尺度散射。 以前只使用垂直分量全球地震台网数据的工作的局限性是，存在散射强度的快速变化，并且在某些区域，在没有交叉路径的情况下记录高能前兆，不可能区分近源和近接收器散射。 本项目将利用三分量全球和区域网络数据分析前兆的慢度及其时间变化，以减少源-接收器模糊问题。 这项研究将分析宽孔径阵列数据，以生成高分辨率的散射强度区域图像。 该项目还将使用PKP尾波到达，它比前体采样更厚的地幔部分，以检查CMB上方1000公里以上的小规模散射。