2D and 3D Seismic Imaging of Seamount Collision and Subduction Across the Central Chilean Margin

该项目将分析在智利中部边缘收集的一组OBH地震数据，在那里，安第斯山脉的胡安费尔南德斯海岭正在俯冲。 速度结构将沿垂直于海岸的两个断面沿着确定，并在瓦尔帕莱索盆地下可能埋藏的海山上方的网格中确定。 这些数据将用于：（1）检验是否存在海山，如果存在，是否作为可能成为1985年地震震源的“凹凸”;（2）确定增生楔和岩石圈的三维形状和速度结构，以限制沉积物孔隙度和俯冲板块的弹性。

This project will analyze a set of OBH seismic data collected off the margin of central Chile where the aseismic Juan Fernandez Ridge is being subducted. Velocity structure will be determined along two transects normal to the coast and in a grid sited over a possible buried seamount under the Valparaiso Basin. The data will be used to (1) test whether there is a seamount and if so whether it acts as an "asperity" which may have served as a focus for the 1985 earthquake and (2) determine the 3D shape and velocity structure of the accretionary wedge and lithosphere to constrain sediment porosity and elasticity of the subducting plate.