中文摘要：

上／下盘效应是近断层地震动的显著特征之一。上／下盘效应的影响因素很多，由于靠近断层，与震源相关的因素成为主导因素，尤其是断层倾角的影响最为明显。本文采用二维有限元数值模拟的方法模拟了近断层地震动，定量地考查了断层倾角对上／下盘效应的影响。结果表明：无论是走滑型断层还是倾滑型断层，随着断层倾角从0°～90°的增大过程中，上／下盘效应先迅速增大然后缓慢减小。

英文摘要：

The hanging wall/footwall effect is one of the important characteristics of the near-fault ground motion. There are many factors that affect the hanging wall/footwall effect, however, in the near-fauh zone, the factor related to the source mechanism is the most important one, especially the fault dip angle. In this article, the authors make use of the 2D finite element method to simulate the near-fauh ground motion, then quantitatively investigate the influence of the fault-dip on the hanging wall/footwall effect. The result shows that for both the buried strike- slip faults and dip-slip faults, as the fault dip increases from 0°to 90°the hanging wall/footwall effect immediately gets obvious first and then obscure gradually.