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Structure of crust and upper mantle beneath NW Himalayas, Pamir and Hindukush by multi-scale double-difference seismic tomography
Bhatti, ZI (Bhatti, Zahid Imran)1,3; Zhao, JM (Zhao, Junmeng)1,2; Khan, NG (Khan, Nangyal Ghani)4; Hussain, SST (Hussain, Shah Syed Tallataf)1,3,4
Source PublicationPHYSICS OF THE EARTH AND PLANETARY INTERIORS
2018-08-01
Volume281Issue:0Pages:92-102
DOI10.1016/j.pepi.2018.06.001
Abstract

The India-Asia collision and subsequent subduction initiated the evolution of major tectonic features in the Western Syntaxis. The complex tectonic structure and shallow to deep seismicity have attracted geoscientists over the past two decades. The present research is based on a 3D tomographic inversion of P-wave arrival time data to constrain the crustal and upper mantle structure beneath the NW Himalayas and Pamir-Hindukush region using the Double-difference tomography. We utilized a very large multi-scale dataset comprising 19,080 earthquakes recorded at 397 local and regional seismic stations from 1950 to 2017. The northward dipping seismic zone coinciding with the low velocity anomaly suggests the subduction of the Indian lower crust beneath the Hindukush. The extent of the northward advancing Indian slab increases from east to west in this region. We observed no signs of northward subduction of the Indian plate under the Hindukush beyond 71 degrees longitude. The Indian plate overturns due south after interacting with the Asian plate beneath the southern Pamir, which correlates with the counter-clockwise rotation of the Indian plate. The Asian plate is also imaged as a southward subducting seismic zone beneath the southern Pamir. In the NW Himalayas, the northward subducting Indian plate appears as a gently dipping low velocity anomaly beneath the Karakoram Block. The stresses caused by the collision and subduction along the Shyok Suture and Indus Suture are translated to the south. The crustal scale seismicity and high velocity anomalies indicate an intense deformation in the crust, which is manifested by syntaxial bends and thrust faults to the south of the Main Mantle Thrust.

Subject Area地质学
WOS IDWOS:000439400200009
Language英语
Indexed BySCIE
KeywordPn Anisotropic Tomography Velocity Structure Kush Region Tectonic Evolution Northern Pakistan Tien-shan Break-off Subduction Zone Arc
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
Cooperation Status国际
ISSN0031-9201
Department大陆碰撞与高原隆升重点实验室
PublisherELSEVIER SCIENCE BV
Citation statistics
Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/8583
Collection图书馆
Corresponding AuthorZhao, JM (Zhao, Junmeng)
Affiliation1.Chinese Acad Sci, Key Lab Continental Collis & Plateau Uplift, Inst Tibetan Plateau Res, Beijing 100101, Peoples R China;
2.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China;
3.Univ Chinese Acad Sci, Yuquan Rd, Beijing 100049, Peoples R China;
4.COMSATS Inst Informat Technol, Abbottabad 22060, Pakistan.
Recommended Citation
GB/T 7714
Bhatti, ZI ,Zhao, JM ,Khan, NG ,et al. Structure of crust and upper mantle beneath NW Himalayas, Pamir and Hindukush by multi-scale double-difference seismic tomography[J]. PHYSICS OF THE EARTH AND PLANETARY INTERIORS,2018,281(0):92-102.
APA Bhatti, ZI ,Zhao, JM ,Khan, NG ,&Hussain, SST .(2018).Structure of crust and upper mantle beneath NW Himalayas, Pamir and Hindukush by multi-scale double-difference seismic tomography.PHYSICS OF THE EARTH AND PLANETARY INTERIORS,281(0),92-102.
MLA Bhatti, ZI ,et al."Structure of crust and upper mantle beneath NW Himalayas, Pamir and Hindukush by multi-scale double-difference seismic tomography".PHYSICS OF THE EARTH AND PLANETARY INTERIORS 281.0(2018):92-102.
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