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

该项目建议利用PKP前兆和尾波的三分量网络和阵列记录来研究地幔中的小尺度散射。以前的工作仅使用垂直分量全球地震台网数据的局限性在于，散射强度存在快速变化，并且在一些区域，在没有交叉路径的情况下记录能量前兆，不可能区分近源散射和近接收源散射。该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，以减少震源-接收器的歧义问题。这项研究将分析大口径阵列数据，以产生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，其采样的地幔部分比前驱体采样的更厚，以检查CMB上方1000多公里处的小范围散布。

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.