Imaging Mantle Discontinuity Structure Beneath the Tibetan Plateau and Cascadia Subduction Zone

青藏高原和卡斯卡迪亚俯冲带下方的地幔不连续结构成像

• 批准号: 9614401
• 负责人: Kenneth Dueker
• 金额: $ 7.97万
• 依托单位: University of Colorado at Boulder
• 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 2000-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9614401&HistoricalAwards=false
• 关键词: Imaging; Mantle; Discontinuity; Structure; Beneath

9614401 Dueker This research involves the formation of images of the mantle discontinuity structure beneath two important geologic transects: one across the Tibetan Plateau and the other across the Cascadia subduction zone. This is done by means of common mid-point stacks of source-normalized radial P-wave arrivals, i.e. receiver functions. Previous work with the 1993 Snake river Plain and 1992 Rocky Mountain Front PASSCAL arrays shows that this technique of common mid-point stacking can significantly improve the isolation of direct converted P to S arrivals from mantle discontinuities with respect to single station stacks. The mantle structures under the Tibetan Plateau and Cascadia subduction zones are important to interpretation of the present day crustal forces and their evolutionary histories in these seismically active areas. This research is a component of the National Earthquake Hazard Reduction Program. ***

9614401 Dueker这项研究涉及在两个重要的地质样带下地幔不连续结构的图像形成：一个横跨藏族高原，另一个横跨卡斯卡迪亚俯冲带。 这是通过源归一化径向P波到达的常见中点堆栈（即接收器功能）来完成的。 先前与1993年的蛇河平原和1992年落基山脉前密封阵列的工作表明，这种常见的中点堆叠技术可以显着改善直接转化后的P与单个站堆栈的地幔不连续性的直接转化P到达。 藏族高原和卡斯卡迪亚俯冲带下的地幔结构对于解释当今的地壳及其在这些地震活性区域中的进化历史很重要。 这项研究是国家地震危害计划的组成部分。 ***