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

本项目拟利用三分量网络和阵列记录的PKP前体和尾波来研究地幔中的小尺度散射。以往仅使用垂直分量全球地震台网数据的工作的局限性在于，散射强度存在快速变化，并且在某些区域，在没有交叉路径的情况下记录高能前体，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驱体的慢度及其时间变化，以减少源-接收者模糊问题。该研究将对大孔径阵列数据进行分析，生成高分辨率的区域散射强度图像。该项目还将利用PKP的尾波到达，对地幔中比先前取样更厚的部分进行取样，以检查CMB上方1000公里以上的小规模散射。

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.