Three-Dimensional Modeling of Seafloor Geo-Acoustic Interaction

SPECFEM3D波浪传播代码的更新将被开发，以便它可以处理海底-海洋界面及其附近的完全弹性的3-D行为。目前的版本并没有完全考虑到衰减，二维模型已经表明衰减是固体-流体界面和多孔浅层沉积物中压缩和剪切能量分配的关键因素，这些沉积物是大部分海底的特征。更新代码的预测将与常用的抛物线方程算法进行基准测试，该算法非常适合远距离（远场）计算，从而可以研究从震源到近场再到远距离接收器的水生地震相位。来自北太平洋的数据集将为模型参数测试提供约束条件。

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.