Numerical models of subduction zones: Causes and dynamics of the trench roll back effect with application to the Mediterranean and other subduction zones

俯冲带不是静止的，其中许多都显示出明显的海沟迁移，有时也被称为“回滚”（例如地中海或汤加俯冲带）。虽然近年来这些迁移率已被量化到一个很好的分辨率，但这一过程的基本物理原理却知之甚少。提出了一套控制机制或参数，包括附近大陆的流动性嵌入俯冲板块，mantledrag，过渡区内的阻力，流变耦合到覆盖板，流变板等。建立流体动力学数值模型，求解流体方程、能量方程和流变方程，研究俯冲和海沟迁移的自洽演化。它将试图确定不同的机制的动态特性，并与动态，流变学和配置参数的不同情况下，沟槽迁移率。然后，将尝试将不同的机制和迁移率与可观察的量（如拍击内和覆盖区域内的应力、地形）联系起来。上升速率重力等等建立俯冲和海沟迁移参数数据库，并与模型结果进行比较。将特别强调地中海和汤加俯冲带的“后退效应”。

Subduction zones are not stationary, many of them show a pronounced trench migration, sometimes also called "roll back" (e g the Mediterranean or the Tonga subduction zones). While these migration rates have been quantified to a good resolution in recent years, the underlying physics of this process is only poorly understood. A set of controlling mechanisms or parameters is proposed including the mobility of nearby continents embedded in the subducting plate, mantledrag, resistance within the transition zone, rheological coupling to the overriding plate, and rheological slab properties among others. Fluid dynamical numerical models will be carried, in which the flow-, energy-, and rheological equations will be solved to study the self-consistent evolution ob subduction and trench migration. It will be tried to identify the dynamic characteristics of the different mechanisms and to relate dynamical, rheological, and configurational parameters of different cases to trench migration rates. It will then be tried to relate the different mechanisms and migration rates to observable quantities, such as stresses within the slap and in the overriding region, topography. uplift rates, gravity, and others. A data base of subduction and trench migration parameters will be built and compard to the model results. Particular emphasis will be put on the "roll back effects" of the Mediterranean and the Tonga subduction zones.