二维不规则海底地形对海底地震动的影响

讨论了海底地形对海底地震动的影响，并用有限元方法对二维问题进行了具体的研究。文中用参数分析的方法，就海底凸起地形和凹陷地形以及不同的海水深度，进行了海水与海床上体系在基底地震动输入下的流固耦合反应计算，取得了对所讨论问题的基本认识：（1）海床上高处的地震反应比低处的大，高处与低处间凹角处的反应则为最小；（2）随着海水深度的增大，对凸起地形来说，海床上的地震反应趋小，而对凹陷地形来说，这一点不明显。

Effects of 2-D irregular seafloor topography on undersea ground motion

The effects of seafloor topography on undersea ground motion is discussed in this paper. And a study on two-dimensional problems is done by finite element techniques. The fluid-soil coupling response computations of the system composed of sea water and seabed soil excited by base-rock shaking are fulfilled for the cases of convex and concave seafloor topography with differ- ent sea depths. Using the parameter analysis method the basic knowledge relevant to the problem above is gained:(1) the seismic response of higher place of seabed is greater than that of the lower place of seabed, and the response of the concave angular region between the higher place and the lower one is the smallest;(2)the seismic response of seabed becomes smaller for the convex case when the depth of sea water increases, and this phenomenon is not obvious for the concave seafloor to- pography. The geometric models of the problem of irregular seafloor topography are symmetrical. And the boundary conditions of the computations, especially those of the sea water portion are givien.