Seismological Investigations of Deep Earth Structure

Peter M.全球地震网络提供的大量高质量数字记录的日益增加，使得研究地球深部结构的各种新方法成为可能。 通过分析成百上千的地震图，通常可以解决数据中的新特征，或者对以前在较小尺度上解决的问题进行更全面的分析。 该项目将继续并扩展加州大学全球地震数据的分析。圣地亚哥，以解决各种地球物理问题。 其中包括：（1）利用反射和转换的地震相位解析上地幔中的地震不连续性，（2）对地幔中的不连续地形和三维地震速度变化进行综合反演，（3）分析纵波和横波以解析地幔衰减结构的细节，（4）寻找可能将地幔分隔成不同对流单元的假设中地幔间断。（5）研究和模拟小尺度地幔结构散射的高频波。（6）长周期波形互相关和聚类分析技术的发展和应用。 这项研究可能会导致改进地震数据分析方法，并对地球深部结构、组成和演变提出新的限制。 大部分资金将提供研究生和博士后支持，以促进地球科学的教育。

EAR-0229323Peter M. ShearerThe increasing availability of large numbers of high-quality digital records from the global seismic networks has made possible a variety of new ways to study deep Earth structure. By analyzing hundreds or thousands of seismograms, it is often possible to resolve new features in the data, or to perform more comprehensive analyses of problems that were previously addressed on smaller scales. This project will continue and extend analyses of global seismic data at U.C. San Diego to address a variety of geophysical issues. These include: (1) Resolution of seismic discontinuities in the upper mantle using reflected and converted seismic phases, (2) Integrated inversions for discontinuity topography and three-dimensional seismic velocity variations in the mantle, (3) Analyses of both compressional and shear waves to resolve details of mantle attenuation structure, (4) A search for hypothesized mid-mantle discontinuities that may separate the mantle into different convecting cells, (5) Study and modeling of high-frequency waves scattered from small-scale mantle structure, and (6) Development and application of waveform cross-correlation and cluster analysis techniques to long-period waveforms. This research is likely to lead to improved methods for seismic data analysis and new constraints on deep Earth structure, composition and evolution. The bulk of the funding will provide graduate student and postdoc support that will further education in the Earth Sciences.