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

利用永久和临时宽带区域网络完善下地幔地震模型

• 批准号: 9706663
• 负责人: Jeroen Ritsema
• 金额: $ 9万
• 依托单位: University of South Carolina at Columbia
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-08-15 至 1999-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9706663&HistoricalAwards=false
• 关键词: Utilizing; Permanent; Temporary; Broadband; Regional

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. ***

9706663 Ritsema 这项研究涉及使用高质量、宽带数字地震网络的扩展数据库，包括永久和临时的数据来反演以前采样不足的区域（尤其是下地幔）的地球结构。 几种源-接收器路径几何形状提供了对印度洋、南太平洋和大西洋下方最下地幔的独特采样，这些采样无法与过去的地震台覆盖范围相媲美。 主要目标是为未绘图区域构建地震模型，并分析下地幔中地震速度结构变化的全长度尺度谱。 这些方面对于增进我们对地震结构与该地区热成分和化学成分的关系及其对核幔边界附近动力学过程的影响的理解仍然至关重要。 ***