Three Dimensional Models of Flow and Deformation in Subduction Zones

PI将建立详细的俯冲带流动的三维模型，以与地震测定的俯冲岩石球体板块的流动、变形和应力进行比较。通过求解俯冲带周围有限区域(几千公里)内的三维流动，并将这种小尺度解叠加到全球板块运动和大尺度对流产生的大尺度流动上，可以获得足够的分辨率。由层析成像推断的密度异常驱动的流动将被包括在内。这些模型的分析将追踪俯冲物质的流动，确定与深部地震活动有关的应力和变形，并约束地幔的粘度和结构。这些模型将使人们对俯冲过程的动力学和力学有一个定量的了解。

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.