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Contemporary Crustal Deformation Within the Pamir Plateau Constrained by Geodetic Observations and Focal Mechanism Solutions
He, JK (He, Jiankun)1,2,3; Pan, ZY (Pan, Zhengyang)2,3; Li, J (Li, Jun)4
刊名PURE AND APPLIED GEOPHYSICS
2018-12-01
卷号175期号:10页码:3463-3484
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
ISSN号0033-4553
DOI10.1007/s00024-018-1872-3
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.

学科主题地质学
WOS研究方向Geochemistry & Geophysics
语种英语
出版者SPRINGER BASEL AG
WOS记录号WOS:000447266800006
内容类型期刊论文
源URL[http://ir.itpcas.ac.cn/handle/131C11/8531]  
专题青藏高原研究所_图书馆
通讯作者Pan, ZY (Pan, Zhengyang)
作者单位1.Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China;
2.Chinese Acad Sci, Key Lab Continental Collis & Plateau Uplift, Inst Tibetan Plateau Res, Beijing 100101, Peoples R China;
3.Univ Chinese Acad Sci, Dept Earth Sci, Beijing 100101, Peoples R China;
4.China Earthquake Adm, Monitoring & Applicat Ctr 2, Xian 710054, Shaanxi, Peoples R China.
推荐引用方式
GB/T 7714
He, JK ,Pan, ZY ,Li, J . Contemporary Crustal Deformation Within the Pamir Plateau Constrained by Geodetic Observations and Focal Mechanism Solutions[J]. PURE AND APPLIED GEOPHYSICS,2018,175(10):3463-3484.
APA He, JK ,Pan, ZY ,&Li, J .(2018).Contemporary Crustal Deformation Within the Pamir Plateau Constrained by Geodetic Observations and Focal Mechanism Solutions.PURE AND APPLIED GEOPHYSICS,175(10),3463-3484.
MLA He, JK ,et al."Contemporary Crustal Deformation Within the Pamir Plateau Constrained by Geodetic Observations and Focal Mechanism Solutions".PURE AND APPLIED GEOPHYSICS 175.10(2018):3463-3484.
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