High-Resolution Studies of Upper-Mantle Using New Techniquesfor the Analysis of Reflected, Refracted and Surface Waves

这项研究旨在绘制上地幔地震速度精细结构的横向变化图，并将这些变化与基本地球动力学过程联系起来。这项研究的技术基础是应用以前美国国家科学基金会资助下开发的两种理论技术：第一种使用长周期、SH极化的ScS混响来成像沿短弧线的地幔反射率的垂直剖面；第二种是从地震记录的复杂部分提取与频率相关的旅行时形式的相位信息并反演这些信息以获得地球结构的通用技术。通过将这两种技术结合应用于反射和折射地震波，研究人员将研究上地幔的个别地震剖面，以确定结构、成分和动力学。

This research is to map lateral variations of the fine structure of seismic velocities in the upper mantle and to relate these variations to fundamental geodynamical processes. The technical basis for the investigation is the application of two theoretical techniques developed under previous NSF grants: the first uses long-period, SH-polarized ScS reverberations to image the vertical profile of mantle reflectivity along short arcs; the second is a general technique for extracting phase information in the form of frequency-dependent travel times from complex parts of seismograms and inverting this information to obtain earth structure. By means of the combined application of these two techniques to reflected and refracted seismic waves, the investigator will study individual seismic profiles in the upper mantle to determine structure, composition and dynamics.