气候变化领域集成服务门户(CCPortal): Rupture process of the Minxian-Zhangxian, Gansu, China M(S)6. 6 earthquake on 22 July 2013

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DOI	10.6038/cjg20150607
	Rupture process of the Minxian-Zhangxian, Gansu, China M(S)6. 6 earthquake on 22 July 2013
	Sun Meng; Wang Wei-Min; Wang Xun; He Jian-Kun
通讯作者	Wang, WM (通讯作者)
发表日期	2015
ISSN	0001-5733
起始页码	1909
结束页码	1918
卷号	58 期号:6
英文摘要	On July 22, 2013, a major earthquake (M(S)6. 6) occurred on the boundary of Minxian and Zhangxian in Gansu province, with its epicenter near the Lintan-Dangchang fault. Based on the finite fault model constructed, the rupturing process of this earthquake was determined by the waveform method using 12 near source strong motion three-component records provided by China Earthquake Data Center. Strike, dip angle, and rake angle of seismogenic fault as well as focal depth are supposed to be known before the waveform inversion based on a finite fault model. The focal mechanism of the earthquake is obtained by a dislocation source model utilizing 30 far-field P vertical waveform records with uniform azimuth coverage and 12 near-field P-wave initial motions. Geometric parameters of the seismogenic fault plane and focal depth adopted in the inversion were determined by considering information such as results of different institutions and scholars, waveform fitting obtained by treating two nodal planes as fault planes, and strike of existing faults in this area. The strike is 300. 2 degrees, dip angle is 66 degrees, slip angle is 47. 7 degrees, focal depth is 7 km. In the process of inverting rupture process of this earthquake using strong motion records, Green's function was calculated by f-k integration and source parameters over the fault, including slip amount, slip rake, rise time and rupture velocity, which were inverted by simulated annealing method. In order to check the accuracy of source parameters deduced by strong motion records, we use the deduced source parameters to calculate the far-field synthetic waveforms and then compare them with observed ones. Results show that slip over the seismogenic fault is centralized nearby the focal source, maximum slip is around 80 cm, and no slip on the surface of ground. This earthquake is dominated by over-thrust with sinistral strike-slip component, consistent with other faults in this area. The rupturing ended at 8 s. Seismic moment M-0 is 1. 60 X10(25) dyn . cm, moment magnitude M-W is 6. 1. Considering the strike of the seismogenic fault and aftershocks' distribution matches with Lintan-Dangchang fault, rake and dip of seismogenic fault are also similar to those of eastern part of Lintan-Dangchang fault, we deduce this earthquake was related with the north forward extrusion of the east Kunlun fault and resulted from the further activity of the Minxian-Dangchang fault.
关键词	MOTION
英文关键词	Minxian-Zhangxian earthquake; Strong ground motion; Simulated annealing method; Rupture process
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000357442300007
来源期刊	CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258417
推荐引用方式 GB/T 7714	Sun Meng,Wang Wei-Min,Wang Xun,et al. Rupture process of the Minxian-Zhangxian, Gansu, China M(S)6. 6 earthquake on 22 July 2013[J]. 中国科学院青藏高原研究所,2015,58(6).
APA	Sun Meng,Wang Wei-Min,Wang Xun,&He Jian-Kun.(2015).Rupture process of the Minxian-Zhangxian, Gansu, China M(S)6. 6 earthquake on 22 July 2013.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,58(6).
MLA	Sun Meng,et al."Rupture process of the Minxian-Zhangxian, Gansu, China M(S)6. 6 earthquake on 22 July 2013".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 58.6(2015).