利用场址的地震影响烈度资料的烈度区划方法──以山西、四川为例

Seismic Zoning Based On Site Earthquake Response Intensity ──Taking Shanxi and Sichuan for Example

本文在证明场址的地震影响烈度的频次与相应的烈度值星对数线性关系的基础上，利用最大似然法，以山西南部（３５．５°～３８°Ｎ，１１１°～１１３°Ｅ）和四川西部（２６°～２９°Ｎ，１０１°～１０３°Ｅ）为例，求出各场址的β，λ和Ｉｍａｘ，得出各场址的烈度危险性分析曲线，并用“逻辑树”方法对各场址的危险性结果进行不确定校正，由此得到二区域的烈度区划图。结果表明，这种方法是可行的，尤其是针对呈现过烈度异常的区域，本方法的结果更能显示其特殊性。

In this paper, based on the identification for the frequency of earthquake response intensity in site and the relavant intensity value showed a logarithsic linear relationship, taking the southern part of Shanxi Province (35. 5°～38°N, 111°～113°E) and thewestern part of Sichuan Province (26°～29°N, 101°～103°E) for example, the curves of the seismic risk analysis for intensity for various sites in these rigions have been obtained with the estimation of fi, A and Imax for each site by the maximum likelihood. At same time, the 'logic tree' method can be used to calibrate the uncertainty of the risk results. Therefore,the seismic zoning map for two regions have been achieved. The final results indicate that this method is practically utilized, particulaly for the sites showing intensity anomaly.