The Effect of Subducting Seafloor Roughness on Forearc Kinematics, Pacific Coast Costa Rica

9526955大洋板块在大陆边缘下的Fisher俯冲通常涉及到弧前区域的隆升，最近的研究表明，地震脊等大型特征的俯冲引起了下沉浮力物质上方边缘的差异隆升。该项目将检验这样一种观点，即沿沉积物匮乏的辐合边缘，弧前变形的特征是由进入的海底测深的粗糙度控制的上部板块的差异隆起。这项工作包括整合哥斯达黎加外美洲中部海沟的构造、测深地震和大地测量资料，以确定下行地形与由此产生的上部板块差异隆起地形之间的联系，以及与这些现象相关的操作运动学、应力方向和地震活动性。研究结果将有助于了解活动前弧区的隆升和俯冲带的总体动态。

9526955 Fisher Subduction of oceanic plates under continental margin commonly involves uplift of forearc regions, and recently it has been shown that subduction of large features such as seismic ridges causes differential uplift in the margin above the down-going buoyant material. This project will test the idea that along sediment starved convergent margins forearc deformation is characterized by differential uplift in the upper plate controlled by the roughness of the incoming seafloor bathymetry. This work involves integration of structural, bathymetric seismic and geodetic information in the middle America trench off Costa Rica to determine the linkage between down-going topography and the resulting differential uplift topography of the upper plate, and the operative kinematics, stress orientation and seismicity associated with the phenomena. Results will be useful in understanding uplift in active forearc regions and is subduction zone dynamic generally.