Direct Imaging of Crust and Upper Mantle Structure with Broadband Seismic Arrays

9904043 Pavlis该项目提出开发在宽带地震台阵上直接成像P到S转换相位的新技术。 PI建议在四个主要分析方面开展工作，以开发可应用于大型宽带数据集（如IRIS台站和临时PASSCAL部署收集的数据集）的工作程序：1）波场分离和反褶积; 2）了解设计加权叠加算法的最佳方法; 3）静校正; 4）多重叠加和波场成像。 这项新技术将发展成为一种可行的程序，并用于处理两个不同尺度的宽带阵列：将处理来自科罗拉多西北部的Lotera阵列的数据，以确定与科罗拉多高原和怀俄明州克拉通之间的前寒武纪缝合线有关的下地壳和上地幔结构的差异。 从正在天山部署的一个阵列获得的数据将用于确定陆内碰撞带主要上地幔不连续性和地壳结构横向变化的地形。

9904043Pavlis This project proposes to develop new techniques in direct imaging of P to S converted phases on broadband seismic arrays. The PI proposes to work on four main analytical fronts for developing a working procedure that can be applied to large, broadband datasets such as those collected by IRIS stations and temporary PASSCAL deployments: 1) wavefield separation and deconvolution; 2) understanding optimal ways to design the weighted stacking algorithm; 3) statics; and 4) multisource stacking and wavefield imaging. The new technique will be developed into a workable procedure and used to process two broadband arrays at different scales: data from the Lodore array in northwestern Colorado will be processed to define the difference in lower crust and upper mantle structure associated with a Precambrian suture between the Colorado Plateau and the Wyoming craton. Data from an array being deployed in the Tien Shan will be used to define topography on major upper mantle discontinuities and lateral variations in crustal structure at an intracontinental collisional zone.