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我国的抗震设计规范以烈度区划图作为设防基础,其本质上是对地震破坏作用地区分布的一种预测,因此可看做供抗震设计用的地震影响场。地震影响场可用地面运动特征和烈度分布来表示,后者通常称为宏观影响场。某一地点的基本烈度主要是根据周围地区可能发生的强震和烈度衰减规律确定。所以,宏观影响场或烈度衰减规律在地震危险性区划中具有重要意义。
China’s seismic design code uses the intensity zoning map as the basis for fortification. It is essentially a prediction of the regional distribution of earthquake damage. Therefore, it can be regarded as an earthquake-affected field for seismic design. Earthquake-affected fields can be represented by ground motion characteristics and intensity distributions, the latter commonly referred to as macroscopic impact fields. The basic intensity of a site is mainly determined by the law of strong earthquakes and intensity attenuation that may occur in the surrounding area. Therefore, the macro-influenced field or intensity attenuation law is of great significance in seismic hazard zoning.