Fine Structure of the Mantle from Global Broadband Studies

该项目将系统地分析全球宽带和选定的区域数据，以新的方法和更高的分辨率解决有关地幔状态的问题。第一个项目致力于通过观测P和PP之间的散射波来了解整个地幔的小尺度（~10公里）非均质性分布。全球地震台网数据库中许多P波序列的包络叠加显示了能量作为距离和到达时间函数的诊断模式。成堆的区域网络观测将通过为少数地区提供更高分辨率的观测来增强分析。利用单散射和多重散射理论进行建模将提供散射体强度随整个地幔深度的函数的剖面。第二项任务是利用反射相分析核幔边界。我们已经确定了超过20,000个PcP和ScP到达，并将尝试绘制核心反射振幅和频率内容的空间变异性。此外，我们已经获得了许多西海岸区域阵列的核心反射记录，可以为CMB的有限区域提供高分辨率结果。

9902995VidaleThis project will sysematically analyze global broadband and selected regional data to addressquestions about the state of the Earth's mantle with new methods and greater resolution. The first project strives to understand the distribution of small-scale (~10 km) heterogeneity throughout the mantle using observation of scattered waves between P and PP. Envelop stacks of many P wave trains in the global seismic network database show diagnostic patterns of energy as a function of range and arrival time. Stacks of regional network observations will augment the analysis by providing higher-resolution observations for a few locales. Modeling with single and multiple scattering theories will provide a profile of scatterer strength as a function of depth in the entire mantle. The second task will be the analysis of the core-mantle boundary by reflected phases. We have identified more than 20,000 arrivals of PcP and ScP and will attempt to map the spatial variability of amplitude and frequency content of core reflections. In addition, we have obtained numerous West Coast regional array recordings of core reflections, which can provide high-resolution results for limited areas of the CMB.