考虑不同区域地震记录具有时间长度不等的特点，对“震中分布分震级网格点密集值”算法进行改进，结合 GIS 的空间分析方法将地震目录中的点数据空间化为能反映地震发生频率的栅格数据；依据地震震级和烈度的关 系以及地震烈度在空间上的椭圆衰减模型，选择逼近和近似的计算手段，并结合空间插值方法得到中国地震烈度 分布的栅格图。从地震频率分布结果上看，大致以宁夏、甘肃、四川和云南为界，中国西部地区3 级以上的地震发生 频率要高于东部地区；从地震烈度分布结果看，中国甘肃、陕西、宁夏、山西、河北、四川、云南等位于地震带内的区 域在发生地震时产生的烈度较高。

Based on the data in seismic catalog , the characteristic of unequal time periods in different areas is considered in the spatialization of earthquake frequency. "Value of grid nodes density calculating of earthquake epicenter distribution group by magnitude" method is improved to spatialize point data to grids which describe earthquake frequency from the seismic catalog with the assistance of GIS spatial analysis methods. Furthermore, according to the relationship between earthquake magnitude and intensity and the model of elliptical attenuation of earthquake intensity, spatial interpolation method, approximation method and approaching method are chosen to obtain grids which describe the average seismic intensity in China. The results of earthquake frequency distribution in China indicates that the frequency of earthquake magnitude above 3 in western China is higher than that of the eastern China bounded by a strip which consists of Shanxi, Ningxia, Gansu, Sichuan and Yunnan provinces. It is concluded from the results of seismic intensity distribution in China that Gansu, Shanxi, Ningxia, Hebei, Sichuan and Yunnan provinces, which are located in seismic belts, are likely to encounter earthquakes that often cause higher intensity.