基于MGR模型修正我国大陆中强以上地震的震级-频度关系和确定震级极限值  

Modification of magnitude-frequency relation and magnitude limit determination based on MGR model for moderate-strong earthquakes in Chinese mainland

作　　者：任雪梅[1,2] 高孟潭[1] 俞言祥[1] 

机构地区：[1]中国地震局地球物理研究所,中国北京100081 [2]宁夏回族自治区地震局,中国银川750001

出　　处：《地震学报》2012年第3期331-338,共8页Acta Seismologica Sinica

基　　金：宁夏回族自治区科技攻关计划项目"宁夏及邻区中强以上地震震后趋势判定及强余震的预测研究"(102164170)资助

摘　　要：从理论上推导了修正的古登堡-里克特模型的震级上限的确定方法,应用常用的两种模型对我国分区域进行了震级-频度关系的修正和震级极限值的确定.结果表明,我国大陆存在非线性的震级-频度关系,传统的NGR模型不能反映非线性的震级-频度关系,而MGR模型能反映适合非线性和线性的震级-频度关系,因此MGR模型适合我国各研究区中强以上地震的震级-频度关系.当震级-频度关系为非线性时,用MGR模型确定的震级极限值较准确.In this paper the method of determining upper magnitude limit following modified Gutenberg-Richter model is derived.Based on two commonly used models the modified magnitude-frequency relations and upper magnitude limits for various regions of Chinese mainland are determined.The result shows that there are nonlinear magnitude-frequency relations for earthquakes in Chinese mainland and the traditional normal G-R model can not reflect nonlinear feature of actual magnitude-frequency relations.While MGR model is suitable for expressing both linear and nonlinear magnitude-frequency relations,and is more suitable for dealing with moderate-strong earthquakes in various regions of Chinese mainland.When the magnitude-frequency relation is nonlinear,the upper magnitude limit determined by using MGR model is more reasonable.

关 键 词：震级-频度关系 震级上限 震级极限值 非线性b值 

分 类 号：P315.3[天文地球—地震学]