1989—1999大同地震序列的隐伏断层研究:库仑应力分析和余震JHD重定位

doi:10.6038/cjg20160215

CORC > 北京大学 > 地球与空间科学学院

	1989—1999大同地震序列的隐伏断层研究:库仑应力分析和余震JHD重定位; Blind-faults of Datong earthquake sequence: JHD and Coulomb stress analyses
	冯永革 ; 王海洋 ; 陈永顺 ; 黄清华
刊名	地球物理学报
	2016
关键词	大同地震库仑应力地震触发 JHD定位方法 Datong earthquakes Coulomb stress Earthquake triggering JHD STRIKE-SLIP FAULTS
DOI	10.6038/cjg20160215
英文摘要	1989年到1999年,大同—阳高地区发生了一系列MS≥5的中强地震.本文基于前人对1989年三次MS≥5地震的震源机制反演的结果,通过建立不同断层模型,利用库仑应力方法,计算前震对于主震,以及前震和主震对于余震的库仑应力触发关系,提出了一种可能的破裂模型,即1989年前震沿北西西方向发生左旋破裂,之后主震和余震沿北北东方向发生右旋破裂.根据这种破裂模式计算得出,前震发生后,主震震源处的库仑应力增加了约2×105 Pa,余震震源处的库仑应力出现下降;主震发生后,余震处的库仑应力出现回升,最后余震处的库仑应力几乎没有变化.基于大同地震台网的近场观测数据,用JHD(Joint Hypocentra...; A series of M-s >= 5 earthquakes struck Datong area from 1989 to 1999. In this study we calculated the Coulomb stress triggering relationship between the foreshock and main shock, and between the foreshock, main shock and the aftershock to test several faulting models from previous studies. We propose one viable faulting model for the three events of 1989 which should be very useful for studying the seismic hazard in this region. Based on the focal mechanisms of the 1989's 3 earthquakes (foreshock, main shock, aftershock) from previous studies, several faulting models from previous studies were constructed for testing here. We then calculated the Coulomb stress triggering relationship between the foreshock and main shock, and between the foreshock, main shock and the aftershock, and the results had led to a viable faulting model for the three events of 1989 as the following. The 1989 foreshock fault stroke left-laterally along the NWW direction. Several hours later, the main shock and the aftershock struck right-laterally along the NNE direction. After the foreshock, the Coulomb stress in the main shock area increased about 2 X 10(5) Pa, while the Coulomb stress in the aftershock area underwent a fall. After the main shock, however, the Coulomb stress in the aftershock area increased. With the access to the data from the Datong earthquake array, one month's aftershocks after the 1999-11-1 M-s = 5.6 earthquake were relocated using JHD (Joint hypocentral determination) method. The distribution of these relocated aftershocks reveals a buried left-lateral fault with the strike of 118 degrees and the dip of 85 degrees. The location of the main event (M-s = 5.6) should be adjusted according to the fault location. The results in this study have suggested that two buried conjugate strike-slip faults control the faulting system of the Datong-Yanggao area, consisting of the NNE fault, corresponding to the main shock in 1989, and the NWW fault, corresponding to the main shock in 1999. We further propose that the shallow NE Dawangcun fault and NW Tuanbao fault are the manifestations of the two buried conjugate faults at the shallow crust.; 中国地震科学台阵探测-南北地震带北段,国家高技术研究发展计划(863),国家自然科学基金委; SCI(E); EI; 中文核心期刊要目总览(PKU); 中国科技核心期刊(ISTIC); 中国科学引文数据库(CSCD); fengyg@pku.edu.cn; johnyc@pku.edu.cn; 02; 568-577; 59
语种	中文
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/448442]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	冯永革,王海洋,陈永顺,等. 1989—1999大同地震序列的隐伏断层研究:库仑应力分析和余震JHD重定位, Blind-faults of Datong earthquake sequence: JHD and Coulomb stress analyses[J]. 地球物理学报,2016.
APA	冯永革,王海洋,陈永顺,&黄清华.(2016).1989—1999大同地震序列的隐伏断层研究:库仑应力分析和余震JHD重定位.地球物理学报.
MLA	冯永革,et al."1989—1999大同地震序列的隐伏断层研究:库仑应力分析和余震JHD重定位".地球物理学报 (2016).