Mapping Earth Structure

绘制地球结构图

• 批准号: 9725808
• 负责人: Donald Helmberger
• 金额: $ 41.55万
• 依托单位: California Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-04-01 至 2003-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9725808&HistoricalAwards=false
• 关键词: Mapping; Earth; Structure

9725808 Helmberger This research is a continuation of highly successful work to map details of earth structure by means of seismic tomography and wave-form matching. Significant results include the discovery of ultra-low-velocity zones just above the core-mantle boundary, whole mantle convection, and seismic anisotropy in the earth's inner core. The research continuation will concentrate on the physical shapes and locations of the ultra-low-velocity zones, the characteristics of inner-core anisotropy in terms of strength distribution and orientation, the agreement of tomographic 3-D models with observed wave forms traveling through the structures, and the sharpness of the upper-mantle transition zones, 410 km and 640 km, as a function of tectonic environment. ***

9725808 Helmberger这项研究是利用地震层析成像和波形匹配绘制地球结构细节图的非常成功的工作的继续。重要的结果包括在核-地幔边界上方发现了超低速带，整个地幔对流，以及地球内核的地震各向异性。继续研究将集中在超低速带的物理形状和位置，核内各向异性在强度分布和取向方面的特征，层析三维模型与通过这些构造的观测波形的一致性，以及作为构造环境函数的410公里和640公里上地幔过渡带的锐度。***