Heterogeneity, Anisotropy, and Anelasticity in the Lowermost Mantle and Inner Core

最下地幔和内核的异质性、各向异性和非弹性性

• 批准号: 9614525
• 负责人: Vernon Cormier
• 金额: $ 17.46万
• 依托单位: University of Connecticut
• 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: 1997-03-01 至 2000-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9614525&HistoricalAwards=false
• 关键词: Heterogeneity; Anisotropy; Anelasticity; Lowermost; Mantle

9614525 Cormier This research is to investigate the heterogeneity, anisotropy, and anelasticity of the earth's lowermost mantle and core by means of observed and predicted seismic waveforms interacting with those structures. PKIKP precursors will be modeled in statistically described structures of the lowermost mantle and compared with observations. In this comparison, a unified model will be determined, consistent with both PKIKP precursor data as well as with all other broadband waveforms interacting with the core-mantle boundary. A study will also be made of the scatter typically found in the measurements of the anelasticity of the inner core. The results of these studies will be important to geodynamic models of slab cycling, plume formation, and chemical heterogeneity of the earth's deep mantle and to the search for constraints on the high pressure mineral phase of iron in the earth's inner core. ***

小行星9614525 本研究系利用观测及预测之地震波形与最下地幔及核部构造之交互作用，探讨其非均匀性、各向异性及滞弹性。 PKIKP前兆将在统计描述的最低地幔结构中建模，并与观测结果进行比较。 在这种比较中，将确定一个统一的模型，与PKIKP前兆数据以及与核幔边界相互作用的所有其他宽带波形一致。 还将对内核滞弹性测量中典型的散射进行研究。 这些研究的结果将是重要的地球动力学模型的板块循环，羽状流的形成，和地球深部地幔的化学不均匀性和寻找铁在地球内核的高压矿物相的限制。 ***