Three Dimensional Models of Flow and Deformation in Subduction Zones

PI将建立详细的俯冲带三维流动模型，与地震测定的俯冲岩石圈板块的流动、变形和应力进行比较。通过对俯冲带周围有限区域（几千公里）内的三维流动进行求解，并将此小尺度解叠加到由全球板块运动和大尺度对流引起的大尺度流动上，即可获得足够的分辨率。由层析成像推断的密度异常驱动的流将包括在内。这些模型的分析将追踪俯冲物质的流动，阻止与深部地震活动有关的矿山应力和变形，并约束地幔粘度和结构。这些模型将使我们能够定量地了解俯冲过程的动力学和力学。

The PI will construct detailed three dimensional models of flow in subduction zone for comparison with seismic determi- nations of the flow, deformation and stress in subducted litho- spheric slabs. Adequate resolution will be obtained by solving for 3D flow in a limited region around the subduction zone (a few thousand kilometers) and superposing this small scale solution on the large scale flow resulting from global plate motions and large scale convection. Flow driven by tomograph- ically inferred density anomalies will be included. The analysis of the models will trace the flow of subducted material, deter- mine stress and deformation associated with deeep seismicity, and constrain mantle viscosity and structure. The models will allow a quantitative understanding of the dynamics and mechanics of subduction processes.