Attenuation relation of seismic intensity is fitted by using 152 complete isoseismic lines from 65 earthquakes greater than MS4.0 from 1940 to 2015 in Inner Mongolia and neighbouring areas.Meanwhile,based on the difference of land form and geological structure characteristic,the areas are divided into eastern regions,western regions and the central regions.And then,intensity attenuation relationships are established separately by using Levenberg-Marquardt method and elliptic attenuation model.Comparisons are made between the respected earthquake influence field model of North China and computed results.The result shows that the relation obtained well represents the features of earthquake damage distribution in the areas,and has positively meaning to guiding the loss assessment immediately after a desastrous earthquake.%在收集和整理内蒙古及邻近地区1940年以来MS4.0以上历史震害资料的基础上,对研究区域进行合理分区,选取65次中强地震事件的152条等震线数据,利用椭圆烈度衰减模型,采用Levenberg-Marquardt非线性反演方法,建立内蒙古及邻区的分区地震烈度衰减关系,通过与地震灾害评估系统使用的华北地区地震影响场模型进行对比分析,综合分析研究认为,建立分区烈度衰减关系更符合研究区域地震灾害的地域性特点,对于地震灾害快速评估具有重要的参考意义.
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