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

智利中部边缘海山碰撞和俯冲的 2D 和 3D 地震成像

• 批准号: 9633451
• 负责人: Colin Zelt
• 金额: $ 8.24万
• 依托单位: William Marsh Rice University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-11-01 至 2000-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9633451&HistoricalAwards=false
• 关键词: 2D; 3D; Seismic; Imaging; Seamount

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.

这个项目将分析在智利中部边缘收集的一组OBH地震数据，那里是无地震的胡安·费尔南德斯山脊被俯冲的地方。速度结构将沿着垂直于海岸的两个横断面和位于瓦尔帕莱索盆地下可能埋藏的海山上方的网格确定。这些数据将被用来(1)测试是否有海山，如果是的话，它是否起到了可能是1985年地震震源的“凹凸体”的作用，以及(2)确定吸积楔和岩石圈的三维形状和速度结构，以限制沉积物的孔隙度和俯冲板块的弹性。