攀西地区“逻辑树”地震区划结果及其对比

The Result and Comparison of "Logical-Tree" Seismic Zoning Map in Panxi Area

按照地震危险性分析的技术思路，讨论了ｂ值、年均发生率和地表空间分布函数等的确定方法，最后以多参数方案组合成“逻辑树”，对攀西地区重新进行了地震烈度区划。结果表明，地震烈度区划图受多种不确定因素影响，需要在地震安全性和投资效益之间谋求某种平衡，在认识水平有限的情况下，以“逻辑树”方法进行地震烈度区划不失为目前一种较好的方法。

On the basis of the technological route of seismic hazard analysis, the methods for determining the seismicity parameters of b values, annual occurrence rates and seismic spatial distribution functions have been discussed. Then, the seismic intensity zoning map of Panxi area in Southwest China is given out by the 'logical-tree' which is made up by multi-parameter acts. It is stated clear by the results that the seismic intensity zoningmap is influenced by many uncertain elements and it is necessary to seek a certain balance between seismic safety and investment interest and it could be regarded as a good at present limited knowledge level to obtain seismic intensity zoning map through 'logical tree' method.