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

英文篇名：Modification of magnitude-frequency relation and magnitude limit determination based on MGR model for moderate-strong earthquakes in Chinese mainland
中文刊名：地震学报
英文刊名：Acta Seismologica Sinica
作者：任雪梅 ; 高孟潭 ; 俞言祥
英文作者：Ren Xuemei1 ; 2) ; Gao Mengtan1) Yu Yanxiang1) 1) Institute of Geophysics ; China Earthquake Administration ; Beijing 100081 ; China 2) Earthquake Administration of Ningxia Hui Autonomous Region ; Yinchuan 750001 ; China
中文关键词：震级-频度关系 ; 震级上限 ; 震级极限值 ; 非线性b值
英文关键词：magnitude-frequency relation ; upper limit magnitude ; magnitude limit ; nonlinear b-value
出版日期：2012-05-15
机构：中国地震局地球物理研究所;宁夏回族自治区地震局;
年：2012
期：03
出版单位：地震学报

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.

引文

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