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

这项研究涉及在两个重要的地质断面下形成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。这是通过源标准化径向p波到达的常见中点堆栈，即接收函数来完成的。先前对1993年Snake river平原和1992年Rocky Mountain Front pascal阵列的研究表明，相对于单站叠加，这种共同中点叠加技术可以显著提高从地幔不连续面直接转换到S的隔离。青藏高原和卡斯卡迪亚俯冲带下的地幔结构对解释这些地震活跃区的现今地壳力及其演化历史具有重要意义。这项研究是国家减少地震危害计划的一个组成部分。* * *

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. ***