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

9526955大陆边缘之下的大洋板块的费舍尔俯冲通常涉及弧前区域的抬升，最近的研究表明，地震脊等大型特征的俯冲在下沉浮力物质上方的边缘引起差异抬升。该项目将检验这样一种观点，即沿沉积物匮乏的会聚边缘弧前变形的特点是由进入海底的水深测量的粗糙度控制的上部板块的差异抬升。这项工作涉及综合哥斯达黎加附近美洲中部海沟的构造、测深地震和大地测量信息，以确定下行地形和由此产生的上部板块差异隆起地形之间的联系，以及与这些现象有关的活动运动学、应力方向和地震活动。这些结果将有助于理解弧前活动区域的隆升，总体上是俯冲带动力学的。

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.