一、情况简介五十年代后期,苏联首先使用地震小区划概念。他们在基本烈度的基础上,对烈度相同的某个地区或一个复杂的工程场地,按场地局部条件,如局部土质条件、地下水位、局部地形和断层影响等进行烈度调整。小区划的结果是一种场地烈度图。近十多年来,地震小区划发展很快。世界上一些多地震国家把它当作减轻地震灾害的一种方法,因而受到普遍重视。目前,它已发展成为一项综合应用的地震工程分支。 I. Introduction In the late fifties, the Soviet Union first used the concept of subregion of the earthquake. Based on their basic intensity, they adjusted the intensity of an area or a complex project site of the same intensity according to local conditions of the site, such as local soil conditions, groundwater table, local topography and fault influence. The result of the zoning is a site intensity map. In the past ten years, the zoning of earthquakes has developed rapidly. Some of the world’s many earthquakes have placed universal emphasis on this as a way of mitigating earthquakes. At present, it has developed into a comprehensive application of seismic engineering branch.