气候变化领域集成服务门户(CCPortal): Present-day crustal deformation of the Pamir constrained by the GPS strain rate, seismic strain rate and earthquake focal stress

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DOI	10.6038/cjg2020N0161
	Present-day crustal deformation of the Pamir constrained by the GPS strain rate, seismic strain rate and earthquake focal stress
	Pan ZhengYang; Shao ZhiGang; Zhou Yon; Wang Xun; Xie MengYU; Yisimayili, Aisa
通讯作者	Shao, ZG (通讯作者)
发表日期	2020
ISSN	0001-5733
起始页码	1143
结束页码	1154
卷号	63 期号:3
英文摘要	The aim of this study is to quantify the characteristics of tectonic deformation in the Pamir area based on the GPS strain, seismic strain and focal stress analysis, which has important significance for understanding the strain partitioning and stress transferring in the process of the northward push of the India continent. Results show that (1) the deformation of the Pamir and its surrounding regions is dominated by NNW-SSE or N-S shortening, coupled with nearly ENEWSW or E-W extension in the interior of the Pamir plateau. In the west of the Pamir plateau and Tajik Basin, the direction of the maximum compressive stress reflects the counterclockwise rotation, while in the Tarim Basin, it is almost consistent with the Pamir plateau, indicating the difference in the strength of both basins as the rigid blocks. (2) The Anderson fault parameters indicate the thrust faulting mechanism in the northern and western margin of the Pamir plateau, and the normal faulting mechanism in the interior of the plateau, which is consistent with the result of the GPS strain. At the same time, the axis of the stress around the Karakorum fault is nearly parallel to the strike of the fault, and the fault slip rate is low at the north end of the Karakorum fault, implying that the deformation in the Pamir plateau is predominated by crustal shortening, incompatible with lateral extrusion or strain partitioning along the large strike-slip fault in the boundary of the Pamir plateau. (3) Integrating that the stress transforming from nearly NNW-SSE in northern Pamir to the N-S direction in the north of the Tien Shan, the strain axis rotates in the both flanks of the Pamir plateau, and the state of the stress field reflected by the Anderson fault parameters, combined with the directions of polarizations of fast shear-waves, we suggest that the deformation of the Pamir plateau can be explained by asymmetric radial thrusting, resulting from the northward push of the Indian plate and collision with the Tien Shan orogenic belt.
关键词	HINDU-KUSH GEODETIC STRAIN TARIM BASIN TIEN-SHAN SEISMOTECTONICS MECHANISMS LITHOSPHERE SUBDUCTION PATTERNS REGION
英文关键词	The Pamir plateau; GPS strain rate; Seismic strain rate; Focal stress field; Asymmetric radial thrusting
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000519847700027
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/259778
推荐引用方式 GB/T 7714	Pan ZhengYang,Shao ZhiGang,Zhou Yon,et al. Present-day crustal deformation of the Pamir constrained by the GPS strain rate, seismic strain rate and earthquake focal stress[J]. 中国科学院青藏高原研究所,2020,63(3).
APA	Pan ZhengYang,Shao ZhiGang,Zhou Yon,Wang Xun,Xie MengYU,&Yisimayili, Aisa.(2020).Present-day crustal deformation of the Pamir constrained by the GPS strain rate, seismic strain rate and earthquake focal stress.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,63(3).
MLA	Pan ZhengYang,et al."Present-day crustal deformation of the Pamir constrained by the GPS strain rate, seismic strain rate and earthquake focal stress".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 63.3(2020).