Global Mantle Structure from Long-Period Body Waves

长周期体波的全球地幔结构

• 批准号: 9628494
• 负责人: T. Guy Masters
• 金额: $ 24万
• 依托单位: University of California-San Diego
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-08-15 至 2000-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9628494&HistoricalAwards=false
• 关键词: Global; Mantle; Structure; Long; Period

9628494 Masters This research is a continuation of the definition of the large- scale structure of the Earth by means of the use of long-period and broad-band digital data to constrain elastic and inelastic structure. The current emphasis is on pushing the analysis to smaller length scales and on incorporating the effects of anisotropy. Seismic data sets will be expanded to improve global coverage, locally densify to the point that regional-scale studies are viable, and improve the precision of attenuation measurements. The mean travel times obtained from such studies are also useful in the development of new one-dimensional models and in the evaluation of the effect of the absorption band on the frequency-dependence of travel times. New data sets will be developed based on the polarization or particle motion of body waves; they are expected to be sensitive to small-scale structure and anisotropy. Research will be done on new parameterizations which allow regional densification to accommodate the improved resolution of the new data sets. ***

本研究是利用长周期和宽带数字数据约束弹性和非弹性结构，对地球大尺度结构定义的延续。目前的重点是将分析推向更小的长度尺度，并纳入各向异性的影响。地震数据集将扩大，以提高全球覆盖范围，局部密度到区域尺度研究可行的程度，并提高衰减测量的精度。从这些研究中得到的平均旅行时间在发展新的一维模型和评价吸收带对旅行时间的频率依赖性的影响方面也很有用。基于体波的极化或粒子运动将开发新的数据集；它们有望对小尺度结构和各向异性敏感。将研究新的参数化，使区域致密化能够适应新数据集的改进分辨率。＊＊＊