Collaborative Research: Imaging of Deep Mantle Shear Structure and the Outer Core

合作研究：深部地幔剪切结构和外核的成像

• 批准号: 9725335
• 负责人: Stephen Grand
• 金额: $ 12.95万
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-05-01 至 2001-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9725335&HistoricalAwards=false
• 关键词: Collaborative; Research; Imaging; Deep; Mantle

9725335 Grand This research is a continuation of efforts to map the three dimensional shear wave structure of the earth's mantle and produce a better seismic model for the outer core. Previously, the travel times of S, ScS, SKS, SKKS and multiple bounce S phases have been measured and inverted to obtain a 3-D model of mantle structure beneath. Long linear fast seismic anomalies interpreted to be slabs sinking to mid-mantle depths were discovered beneath the Americas. This work will extend the detailed analysis to Asian subduction zones. The core-mantle boundary layer D" will also be investigated and mapped relative to slow velocity features in the lower mantle, which may indicate the upwelling part of mantle circulation. Better analysis of the D" variations will enable the improvement of investigations of anisotropy and heterogeneity of the inner core. ***

9725335 Grand这项研究是对绘制地幔三维剪切波结构的努力的延续，并为外核提供更好的地震模型。此前，已经测量并反演了S相、sc相、SKS相、SKKS相和多个弹跳S相的传播时间，从而获得了地幔结构的三维模型。长线性快速地震异常被解释为板块下沉到中地幔深度，在美洲地下被发现。这项工作将把详细分析扩展到亚洲俯冲带。此外，我们还将研究核幔边界层D”，并绘制相对于下地幔的慢速特征，这可能指示了地幔环流的上升流部分。更好地分析D ‘ ’的变化将有助于改进对内核各向异性和非均质性的研究。＊＊＊