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 这项研究涉及形成两个重要地质断面下方地幔不连续结构的图像：一个横跨青藏高原，另一个横跨卡斯卡迪亚俯冲带。 这是通过源归一化径向 P 波到达的公共中点堆栈（即接收器函数）来完成的。 先前对 1993 Snake River Plain 和 1992 Rocky Mountain Front PASSCAL 阵列的研究表明，这种常见中点叠加技术可以显着改善直接转换的 P 到 S 到达与地幔不连续性相对于单站叠加的隔离。 青藏高原和卡斯卡迪亚俯冲带下的地幔结构对于解释这些地震活跃地区的当今地壳力及其演化历史具有重要意义。 这项研究是国家地震减灾计划的一部分。 ***