中国西部地区大地震(M_S≥7)烈度衰减关系改进  

Improvement of intensity attenuation relationship of large earthguake(M_S≥ 7) in the western area of China

作　　者：张苏平[1] 陈文凯[1] 周中红[1] 何少林[1] 蔡辉腾[1] 孙艳泽[1] 

机构地区：[1]中国地震局兰州地震研究所,甘肃兰州73000

出　　处：《自然灾害学报》2015年第1期104-113,共10页Journal of Natural Disasters

基　　金：中国地震局兰州地震研究所地震科技发展基金;国家地震社会服务工程应急救援系统资助项目

摘　　要：考虑近年大地震(MS≥7.0)震后快速灾害评估的需要,利用中国西部地区1900年以来MS≥7.0级地震的资料,采用最小二乘法拟合与分段函数对烈度限定相结合的方法,对西部地区的地震烈度衰减关系进行了改进,并就所得结果的合理性进行了分析;根据大震长轴半径的特点,初步研究了大震极震区长轴半径对烈度衰减规律的影响。Considering the needs of rapid seismic disaster evaluation of large earthquake( MS≥7. 0) in recent years,we used the seismic information data about MS≥7. 0 in the west of China and the method of combination of least squares fitting with the sectional function intensity determination to improve the seismic intensity attenuation relationship in western regions of China and analyzed the results from the method. According to the characteristics of the long axis radius of the large earthquake,we preliminarily studied the influence of long axis radius in meizoseismal area of large earthquake on the intensity attenuation law.

关 键 词：大地震 地震烈度 衰减关系 中国西部 

分 类 号：P315[天文地球—地震学]