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Theoretical modeling and numerical simulation of seismic motions at seafloor

机译：海底地震运动的理论建模与数值模拟

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This paper proposes a modeling and simulation method of seafloor seismic motions on offshore sites, which are composed of the base rock, the porous soil layers and the seawater layer, based on the fundamental hydrodynamics equations and one-dimensional wave propagation theory. The base rock motions are assumed to consist of P- and S-waves and are modeled by the seismological model in southwest of Western Australia (SWWA). The transfer functions of the offshore site are calculated by incorporating the derived dynamic-stiffness matrix of seawater layer into the total stiffness matrix. The effect of water saturation on the P-wave velocity and Poisson's ratio of subsea soil layers are considered in the model. Both onshore and seafloor seismic motions are stochastically simulated. The comparison results show that the seafloor vertical motions are significantly suppressed near the P-wave resonant frequencies of the upper seawater layer, which makes their intensities much lower than the onshore vertical motions. The simulated seafloor motions are in compliance with the characteristics of available seafloor earthquake recordings and can be used as inputs in the seismic analyses of offshore structures. (C) 2015 Elsevier Ltd. All rights reserved.
机译：本文基于基本的流体动力学方程和一维波传播理论，提出了一种由基岩，多孔土层和海水层组成的海上场地海底地震运动的建模与仿真方法。假定基础岩石运动由P波和S波组成，并通过西澳大利亚州西南部（SWWA）的地震学模型进行建模。通过将导出的海水层动态刚度矩阵合并到总刚度矩阵中，可以计算出海上站点的传递函数。该模型考虑了含水饱和度对海底土层纵波速度和泊松比的影响。陆上和海底地震运动都是随机模拟的。比较结果表明，在上海水层的P波共振频率附近，海底垂直运动受到明显抑制，这使其强度大大低于陆上垂直运动。模拟的海底运动符合可用的海底地震记录的特征，可以用作海上结构地震分析的输入。 （C）2015 Elsevier Ltd.保留所有权利。

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