Constraining the Structure and Rotation of the Inner Core

约束内核的结构和旋转

• 批准号: 9902755
• 负责人: Xiaodong Song
• 金额: $ 16.96万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-08-01 至 1999-10-19
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9902755&HistoricalAwards=false
• 关键词: Constraining; Structure; Rotation; Inner; Core

9902755 SongThis proposal is to conduct research in three related areas concerning the anisotropic structure of the inner core and the rotation of the inner core. 1) The study will seek to constrain inner core rotation by simultaneously inverting the inner core rotation rate and small-scale lateral changes of inner core anisotropy using differential PKP travel-time measurements along source-station paths with a long history of recording. 2) The study will constrain 3-D seismic anisotropy by increasing lateral and depth samples of the inner core. 3) The research will search for variable inner core rotation using decades of continuous seismic records at College, Alaska station and neighboring stations. Improved measurement of inner core rotation has implications for the geodynamo and angular momentum exchanges within the Earth's interior, and refined characterization of the inner core anisotropy is important in understanding the source of the anisotropy and the evolution and dynamics of the Earth's core.

9902755 Songsoss的建议是在三个相关领域进行有关内核各向异性结构和内部核心旋转的研究。 1）该研究将通过同时颠倒内部核心旋转速率和内部核心各向异性的小规模横向变化来限制内部核心旋转，并使用差异PKP旅行时间测量沿源站路径具有悠久的记录历史。 2）该研究将通过增加内核的横向和深度样品来限制3-D地震各向异性。 3）研究将使用数十年的大学，阿拉斯加车站和附近的车站进行数十年的连续地震记录搜索可变的内部核心旋转。 改进的内核旋转测量对地球内部内的地球动量和角动量交换具有影响，并且内核各向异性的精致表征对于理解各向异性的来源以及地球核心的演变和动力学很重要。