【作者】 杨凯；

【导师】 倪四道；

【作者基本信息】 中国科学技术大学 ， 地球物理学， 2017， 硕士

【摘要】 地震是主要的自然灾害之一,往往能造成较大的人员伤亡和经济损失。与大地震相比,中强地震虽然释放能量较小,但其发震频率更高,发生在人口密集区域也能够造成巨大的损失。为了地震减灾和地学研究,需要例行测定地震发震时间、位置和强度等主要参数,形成地震目录。其中,震源机制解目录为地震学研究提供了重要的基础资料。本文中,我们首先介绍了中强地震震源参数研究的重要性以及常用的震源参数反演方法;其次介绍了常用的震源机制解目录(Global CMT目录和W-phase目录)及其震源参数反演方法,讨论了两种方法的优缺点以及在中等强度地震震源参数研究中的应用,重点介绍了近年来发展并被广泛使用的地震震源参数反演方法CAP (Cut and Paste)方法以及基于CAP方法发展的一系列其他方法,例如远震体波CAP反演方法(CAPtele )、近震和远震联合CAP反演方法(CAP joint)等;最后,探究使用CAPtele方法建立全球中强地震震源机制解目录的可行性。CAPtele方法使用远震波形数据进行反演,随着全球地震台网的建设和发展,为采用CAPtele方法进行全球中强地震例行反演提供了数据基础,我们使用该方法对2005年至2014年全球中强地震进行了震源参数例行反演,并与Global CMT目录结果进行对比,验证了 CAPtele方法在中强地震震源参数例行反演中的可靠性和稳定性以及其构建全球中强地震震源机制解目录的可行性。更多还原

【Abstract】 Earthquake is one of the major natural hazards, and sometimes can cause large casualties and economic losses. Compared with larger earthquakes, the moderate earthquakes release smaller energy, but the frequency of the moderate earthquakes is even higher. The moderate earthquake happened in desely populated areas will cause huge losses. For earthquake hazard mitigation and geoscience research, earthquake source parameters are determined routinely, such as origin time, location and magnitude,and the earthquake catalog is obtained. Among many kinds of earthquake catalogs, the earthquake focal mechanism solution catalog provides basic data for earthquake study.In this paper, we firstly introduce the importance of moderate earthquake source parameter study and some methods widely used in earthquake source parameter inversion. Secondly, we introduce two commonly used earthquake focal mechanism solution catalogs (Global CMT catalog and W-phase catalog) and their source parameters inversion methods. And then, we discuss the advantages and disadvantages of the two methods in moderate earthquake parameter studies. Also, we introduce another commonly used source parameter inversion method CAP (Cut and Paste) and some CAP-based methods, such as teleseismic body-wave CAP inversion method(CAPtele), CAP joint inversion method that combines both local and teleseismic data(CAPjoint) and so on; Finally, we analyze the feasibility of using these CAPtele methods to construct a moderate earthquake focal mechanism solution catalog.CAPtele method uses teleseismic waveform data in inversion. The development of the seismic network around the world provides data support for the source parameter inversion using CAPtele method. In this paper, we do the inversion for moderate earthquakes from 2005 to 2014 and compare the source parameter result with Global CMT catalog, the reliability and stability of CAPtele method in moderate earthquakes source parameter inversion are proved. We can use the CAPtele method to construct a global moderate earthquake focal mechanism solution catalog.更多还原