气候变化领域集成服务门户(CCPortal): Contemporary Crustal Deformation Within the Pamir Plateau Constrained by Geodetic Observations and Focal Mechanism Solutions

CCPortal

DOI	10.1007/s00024-018-1872-3
	Contemporary Crustal Deformation Within the Pamir Plateau Constrained by Geodetic Observations and Focal Mechanism Solutions
	Pan, Zhengyang; He, Jiankun; Li, Jun
通讯作者	Pan, ZY (通讯作者)
发表日期	2018
ISSN	0033-4553
EISSN	1420-9136
起始页码	3463
结束页码	3484
卷号	175 期号:10
英文摘要	We used an updated data set of 192 GPS-derived surface velocities and 393 earthquake focal mechanisms (Mw > 3.0, hypocenter depths < 30 km) to evaluate the spatial variations in the surface strain rate and crustal stress regime throughout the Pamir Plateau and its surrounding regions. The strain rate field was estimated using the spline in tension approach that solves for the surface velocity in a rectangular grid and the stress field was predicted from focal mechanism solutions using the damped regionalscale stress inversion (DRSSI) method of Hardebeck and Michael (Journal of Geophysical Research, https://doi. org/10.1029/ 2005jb004144, 2006). The results show that the crustal stress field around the Pamir Plateau is predominantly characterized by NNW-SSE compression and E-W extension, which is consistent with the principal orientations of the two-dimensional surface strain rate tensor. This agreement supports the notion that the Pamir and southwestern Tien Shan are uniformly strained blocks. In particular, the fan-shaped rotational pattern between Shmax and the strain rate from the western Pamir to the Tajik Basin shows that the counterclockwise rotation of the Shmax orientation is associated with vertical deformation, which is consistent with the idea of Schurr et al. (Tectonics 33(8): 2014TC003576, 2014) concerning the gravitational collapse and westward extrusion of the crust in the western Pamir. We propose that such a stress-strain pattern, dominated by NNW-ESE oriented compression and E-W trending extension, originated from a combination of the northward push of the Indian continent and the southward subduction of the Tien Shan.
关键词	BAND REGIONAL SEISMOGRAMS FAULT PLANE SOLUTIONS SOUTHERN TIEN-SHAN STRAIN-RATE FIELDS STRESS-FIELD KARAKORAM FAULT WENCHUAN EARTHQUAKE TARIM BASIN NORTHWESTERN CHINA GPS OBSERVATIONS
英文关键词	Focal mechanism; geodetic strain; active deformation; Pamir Plateau; India-Eurasia collision
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000447266800006
来源期刊	PURE AND APPLIED GEOPHYSICS
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/259188
推荐引用方式 GB/T 7714	Pan, Zhengyang,He, Jiankun,Li, Jun. Contemporary Crustal Deformation Within the Pamir Plateau Constrained by Geodetic Observations and Focal Mechanism Solutions[J]. 中国科学院青藏高原研究所,2018,175(10).
APA	Pan, Zhengyang,He, Jiankun,&Li, Jun.(2018).Contemporary Crustal Deformation Within the Pamir Plateau Constrained by Geodetic Observations and Focal Mechanism Solutions.PURE AND APPLIED GEOPHYSICS,175(10).
MLA	Pan, Zhengyang,et al."Contemporary Crustal Deformation Within the Pamir Plateau Constrained by Geodetic Observations and Focal Mechanism Solutions".PURE AND APPLIED GEOPHYSICS 175.10(2018).