中文摘要：

随着计算机技术的飞速发展和地震台网的建设对大城市的地震动数值模拟变成可能。应用地质．地貌以及地球物理勘探等资料建立的三维层结构是保证地震动计算准确性的基础。提出并论证了关于三维层分布模型的建模思路和相关数据处理方法。据此所建立的三维模型符合研究目标区的实际情况，同时，所提供的方法还便于模型的修改和升级。

英文摘要：

The 3D velocity structural model built by using geomorphic and geologic exploration data is important for evaluating strong ground motion. This paper presents a method study on modeling velocity structures. Modeling codes and developed tools based on multi-function software was used to analyze the mass data and information. The B-spline function is proposed to produce the given data points in order to optimize the model. The proposed model is suitable for 3D finite difference simulation for evaluating near-fault strong ground motions from future earthquakes. Compared to other methods, the model is easier to be modified and adjusted, and it is also very significant in the relative fields of earthquake damage mitigation.