【作者】 张晓东；

【导师】 时振梁； 汪素云；

【作者基本信息】 中国地震局地球物理研究所 ， 固体地球物理学， 2004， 博士

【摘要】 探讨强震组孕育发生发展的构造机制,分析强震组发生发展的过程是本文旨在重点研究的问题。强震成组发生的研究包括强震组与孕发构造背景的关系,强震组的活动特征、动力学环境分析、构造物理机制等多个重要方面,它对于地震形势预测、地震中长期预报、以及工程地震研究中的地震危险性分析等均很重要,因而成为当前地震研究工作中的一个分支。 由于中国地震活动性的分区特征明显,同时为了使建立在成组强震概念上的地震预测模型和方法,具有现实性和可操作性,我们在对强震组的研究中,强调了以地震带做为基本的研究单元,进行具体的分析研究。 我们利用地震区划的和地震块体划分的结果,确定成组强震的研究单元,分析研究单元内强震的孕震构造背景,具体分析各强震组的地震活动特性,由于中国东西部孕震背景和地震活动性的差异,因此,本文对中国东、西部强震组分别进行了过程分析,总结出中国大陆东、西部强震组活动的基本规律。在研究中,本文突出了强震组发生的层次性特征,着重分析了强震之间相互影响,相互制约的规律特性,并依据大量的实际地震记录及地震构造调查结果,总结出不同孕震环境下,强震组的发生发展特征。 从理论上我们主要探讨强震为什么会持续发生;强震持续发生所要求的基本条件是什么;强震持续发生的动力来源是什么;并分析了同一地震活动期内的强震组之间的关系。 在实际应用中我们侧重于探讨强震持续发生的起点和止点依据;强震持续发生过程中各相关要素的变化特征,后续强震时空强的判定依据,最终为强震的预测提供佐证。 依据对成组强震所确定的定义为基本判别条件,我们以地震带为统计单元,结合活动构造资料与地震资料对全国进行了分析和判别,共筛选出具有成组特点的地震带及亚带13个,总共划分出77组,其中,中国东部24个组,中国西部地区共计53组,涉及强震626个,占相关研究区内历史地震记载完整以来的6级以上地震总数的近95%。由于喜马拉雅地震带和台湾地震区地震频度非常高,我们未把上述两地区的地震放在分析研究的范畴之内。 根据强震组孕震构造背景和地震活动特点的不同,我们对强震组进行了类型分析,共划分出单一构造型强震组、网络构造型强震组和汇聚构造型强震组。 单一构造型强震组以鲜水河断裂上的强震组活动表现最为典型,表现为强震沿断裂带依次发生,并表现出不同期次的多个强震组成组发生的现象,与活动构造关系清晰。 网络构造型表现为强震组在同一地震带内的相关构造段上地震的跳跃性。这种相关构造段系指,同一地震带内,平行,相交的不同构造段落。此类成组强震主要强调地震带内更多还原

【Abstract】 The main point of this article is to analysis the characteristics of group earthquake and discuss tectonic mechanism of group strong earthquake pregnant development and occurrence. To Analysis the progress of strong earthquake group occurrence. The research includes the relationship between strong earthquake group and earthquake generic tectonic, the activity of strong earthquake, dynamic environment analysis, tectonic mechanism. It’s very important to earthquake tendency prediction, middle-long earthquake prediction, seismic hazard analysis in engineering earthquake research. And it’s a main branch of the earthquake research.Because of the zone characteristic of china seismicity is obviously, and in order to build the prediction method based on strong earthquake group, and it can be handled. We used the seismic belt as research unit.We use the result of seismic zoning map and division of seismic block, and determine the research unit of strong earthquake group, analysis the strong earthquake generic tectonic background. Analysis the seismicity of strong earthquake group, because of the difference of background and seismicity in west and east China. So, this article analysis the progress of west and east China strong earthquake group partly. Summarizing the basic rule of China earthquake activity. In the research, this article stands out the level characteristic of strong earthquake, analysis the rule of influence and restriction between strong earthquakes, and summarizes the development of earthquakes.In theory, we mainly discuss why earthquakes occur successively, what is the basic condition when earthquakes successively occur, that is the dynamic source, and analysis the relationship between group earthquakes in the same seismic active period.In appliance, we discuss the method to determine the force and the end of the strong earthquake group, micro-earthquake status change during the strong earthquake group occur.Based on the definition of strong earthquake group, and the analysis the active tectonic data and earthquake data, this article treat seismic belt as statistic unit, divided 13 seismic belt which strong earthquake group occurred, and 78 group, among them, 24 group in east China, S3 group in west China. 626 earthquakes, it’s 95% of total number in research region. And Himalaya seismic belt and Taiwan seismic zone are not in the statistic range.Based on the earthquake genrating tectonic and seismisity of the group earthquake, we sorting these earthquake group into three kinds, such as single tectonic style, net tectonic style and intersection tectonic style.更多还原