Utilizing Permanent and Temporary Broadband Regional Networks to Refine Seismic Models of the Lower Mantle

这项研究涉及使用不断扩大的高质量、宽带数字地震台网数据库，包括永久和临时数据，来反演以前采样不足地区的地球结构，特别是下地幔。几个震源-接收路径几何图形提供了印度洋、南太平洋和大西洋海底最下层地幔的独特采样，这些采样与过去的地震台站覆盖范围无法获得类似的细节。建立未测绘区域的地震模型和分析下地幔地震速度结构变化的全谱长度尺度是主要目标。这些方面对于提高我们对地震结构与该地区热化学成分的关系及其对核幔边界附近动力过程的影响的理解仍然至关重要。＊＊＊

9706663 Ritsema This research involves the use of the expanding data base of high- quality, broad-band digital seismic networks, both permanent and temporary to invert for earth structure in regions previously undersampled, especially the lower mantle. Several source- receiver path geometries provide unique sampling of the lowermost mantle beneath the Indian, South Pacific and Atlantic oceans that cannot be obtained with comparable detail with past seismic station coverage. The construction of seismic models for unmapped regions and the analysis of the full spectrum of length scales over which seismic velocity structure varies in the lower mantle are primary goals. These aspects remain crucial to advancing our understanding of the relation of seismic structure to the thermal and chemical composition of the region, and their influence on dynamical processes near the core-mantle boundary. ***