Three-Dimensional Modeling of Seafloor Geo-Acoustic Interaction

海底地声相互作用的三维建模

• 批准号: 1260094
• 负责人: Ralph Stephen
• 金额: $ 19.09万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-06-15 至 2016-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1260094&HistoricalAwards=false
• 关键词: Three; Dimensional; Modeling; Seafloor; Geo

Updates to the SPECFEM3D wave propagation code will be developed so that it can handle fully elastic, 3-D behavior at and near the seafloor-ocean interface. The current version does not fully account for attenuation, which 2-D modeling has shown is a key factor in partitioning of compressional and shear energy at the solid-fluid interface and within porous shallow sediments that characterize most of the seafloor. Predictions from the updated code are to be benchmarked against a commonly used Parabolic Equation algorithm that is well suited for long-distance (far field) calculations, thus enabling study study of water-borne seismic phases all the way from source, through the near field, to far-range receivers. A dataset from the North Pacific will provide constraints for model parameter testing.

将开发SPECFEM 3D波浪传播代码的更新，以便它能够处理海床-海洋界面处和附近的完全弹性的3D行为。目前的版本没有充分考虑到衰减，二维模型显示，衰减是在固体-流体界面和多孔浅层沉积物内划分压缩和剪切能量的一个关键因素，而多孔浅层沉积物是大多数海底的特征。更新后的代码的预测将根据常用的抛物方程算法进行基准测试，该算法非常适合于长距离（远场）计算，从而能够对从震源到近场到远距离接收器的所有水上地震相位进行研究。来自北太平洋的数据集将为模型参数测试提供约束。