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关于地震小区域划分的意义,到现在还不很明确。但由于在大区域地震烈度划分的工作中所用的方法和比例尺的关系,同一烈度地带的范围往往很大。在这些地震带中,各地区内复盖层的地质和水文地质特征也往往极不相同。因此,从工程地质观点上来讲,有必要根据土质条件来判断并给地震大区域划分中所确定的基本烈度,以修正数值,即小区域地震烈度(注1)。对地震小区域的划分可以这样来理解,那就是在直线距离大约10—15公里的有限范围内所进行的地震度的划分,在划分中主要考虑到土质条件因地震而
The significance of the regionalization of the earthquake is not yet clear. However, the range of the same intensity zone tends to be large due to the relationship between the method and the scale used in the seismic intensity division in a large area. In these seismic zones, the geological and hydrogeological features of the overburden in each area are often very different. Therefore, from the perspective of engineering geology, it is necessary to judge and give the basic intensity determined in the division of large earthquakes according to soil conditions so as to correct the numerical value, that is, the seismic intensity of small area (Note 1). The division of a small area in an earthquake can be understood as a division of seismicity within a limited range of approximately 10-15 km from a straight line, taking into account mainly the fact that the soil condition is affected by the earthquake