浅谈芦山地震  

A brief talk on the 20 April 2013 Lushan M_W6. 7 earthquake

作　　者：陈运泰[1] 杨智娴[1] 张勇[1] 刘超[1] 

机构地区：[1]中国地震局地球物理研究所,中国北京100081

出　　处：《地震学报》2013年第3期285-295,共11页Acta Seismologica Sinica

基　　金：国家自然科学基金项目(41090291)资助

摘　　要：地震序列是对地震现象的回顾性描述,只有在地震序列结束后它才有可能被确切无疑地判定.鉴于龙门山断裂带或地震带的整体性、统一性和系统性,不可否认在其西南段发生的芦山地震是与汶川地震一样的同属于龙门山断裂带的事件.鉴于芦山地震的震源位置、震源机制、震级大小和破裂区覆盖的范围,目前可认为它是汶川地震迄今最大的余震.鉴于地震序列的判定是对地震现象的唯象的描述,有相当的任意性,对芦山地震究竟是"新的主震"还是"汶川余震"的"讨论"实质上是在根据经验判定地震的类型,即使目前看"主震说"提出的4条"论据"明显缺乏说服力,"余震说"比较有说服力,但最后都需要等到地震序列结束之后才有可能"定论".作者认为,相对于需要等到地震序列结束之后才能"定论"、甚而在地震序列结束之后未必能"定论"的芦山地震究竟是"新的主震"还是"汶川余震"问题,应当更为关注芦山地震的发生引出的一些重要的亟待研究的科学问题与防震减灾问题.An earthquake sequence is a retrospective designation of earthquake phenomena, and it can only be identified without doubt after the earthquake se- quence has been completed. In view of the integrity, uniformity and systematic- ness of the Longmenshan fault zone or seismic belt, there is no denying the fact that the 20 April 2013 Mw6. ？ Lushan earthquake which occurred in the south western segment of the Longmenshan fault is an event of the Longmenshan fault zone as the 12 May 2008 Mw7.9 Wenchuan earthquake. Taking into account the hypocentral location, focal mechanism, magnitude and ruptured area of the Lushan earthquake, it is preferable that the Lushan earthquake is the largest aftershoek up to the present, of the 2008 Mw7.9 Wenchuan mainshock. Due to the fact that the identificaion of an earthquake sequence is phenomenalogical description with arbitrariness to some extent, whether the Lushan earthquake isa new mainshock or one of the aftershocks of the 2008 Wenchuan earthquake is based on empirical knowledge and remains unsolved till the whole earthquake sequence has been completed, even though at present the arguments of the ＂one of the aftershocks of the Wenehuan earthquake＂ are convincing. It is empha- sized that prompt solution should he given to some outstanding scientific issues related to the Lushan earthquake as well as prevention and mitigation of earth- quake disasters.

关 键 词：芦山地震 汶川地震 地震破裂过程 地震成丛 地震序列 

分 类 号：P315.9[天文地球—地震学]