基于远震体波的中等强度地震震源参数反演

发布时间：2018-10-18 18:31

【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。
[Abstract]:Earthquake is one of the main natural disasters, which often causes large casualties and economic losses. Compared with large earthquakes, moderate earthquakes release less energy, but their earthquake frequency is higher, which can also cause huge losses in densely populated areas. In order to study earthquake mitigation and geoscience, it is necessary to routinely determine the time, position and intensity of earthquake occurrence and to form an earthquake catalogue. Among them, the catalogue of focal mechanism provides important basic data for seismological research. In this paper, we first introduce the importance of studying the focal parameters of moderate earthquakes and the methods of inversion of focal parameters, secondly, we introduce the commonly used focal mechanism solution catalogs, (Global CMT catalogue and W-phase catalogue, and the inversion methods of focal parameters. The advantages and disadvantages of the two methods and their applications in the study of focal parameters of moderate earthquakes are discussed. This paper mainly introduces the seismic source parameter inversion method (CAP (Cut and Paste), which has been developed and widely used in recent years, as well as a series of other methods based on the CAP method. For example, the CAP inversion method of teleseismic body wave, (CAPtele), near earthquake and remote earthquake combined with CAP inversion method, (CAP joint), etc. Finally, the feasibility of using CAPtele method to establish the catalogue of focal mechanism of global moderate strong earthquake is explored. CAPtele method uses remote seismic waveform data for inversion. With the construction and development of the global seismograph network, the data base is provided for the routine inversion of the global moderate strong earthquakes using the CAPtele method. We use this method to carry out the routine inversion of the focal parameters of the global moderate strong earthquakes from 2005 to 2014. Compared with the Global CMT catalogue results, the reliability and stability of the CAPtele method in the routine inversion of the focal parameters of moderate earthquakes and the feasibility of constructing the global focal mechanism catalogs of moderate earthquakes are verified.
【学位授予单位】：中国科学技术大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P315

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