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LateralMoho variations and the geometry of the Main Himalayan Thrust beneath the Nepal Himalayan orogen revealed by teleseismic receiver functions
He, P (He, Ping)1,2,3; Lei, JS (Lei, Jianshe)2; Yuan, XH (Yuan, Xiaohui)4; Xu, XW (Xu, Xiwei)2; Xu, Q (Xu, Qiang)5; Liu, ZK (Liu, Zhikun)6; Mi, Q (Mi, Qi)2; Zhou, LQ (Zhou, Lianqing)1
Source PublicationGEOPHYSICAL JOURNAL INTERNATIONAL
2018-08-01
Volume214Issue:2Pages:1004-1017
DOI10.1093/gji/ggy192
Abstract

The lateral Moho variations and the geometry of the Main Himalayan Thrust under the Nepal Himalayan orogen are investigated to determine a new crustal model using a large number of high-quality receiver functions recorded by the HIMNT and HiCLIMB portable seismic networks. Our new model shows an evident and complicated lateral Moho depth variation of 8-16 km in the east-west direction, which is related to the surface tectonic features. These results suggest a non-uniformed crustal deformation, resulted from the splitting and/or tearing of the Indian plate during the northward subduction. Our migrated receiver function images illustrate a discernible ramp structure of the Main Himalayan Thrust with an abrupt downward bending close to the hypocentre of the 2015 Gorkha M-w 7.8 earthquake. The distribution of the aftershocks coincides with the present decollement structure. Integrated with previous magnetotelluric soundings and tomographic results, our results suggest that the ramp-shaped structure within the Main Himalayan Thrust could enhance stress concentration leading to the nucleation of the large earthquake. Our new crustal model provides new clues to the formation of the Himalayan orogen.

Subject Area地质学
WOS IDWOS:000448238600014
Language英语
Indexed BySCIE
Keyword2015 Gorkha Earthquake Indian Lithosphere Beneath Pn Anisotropic Tomography Tibetan Plateau Southern Tibet Collision Zone Crustal Structure Eurasia Collision Steep Subduction Gps Measurements
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
Cooperation Status国际
ISSN0956-540X
Department大陆碰撞与高原隆升重点实验室
PublisherOXFORD UNIV PRESS
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/8573
Collection图书馆
Corresponding AuthorLei, JS (Lei, Jianshe)
Affiliation1.China Earthquake Adm, Inst Earthquake Forecasting, Beijing 100036, Peoples R China;
2.China Earthquake Adm, Inst Crustal Dynam, Key Lab Crustal Dynam, Beijing 100085, Peoples R China;
3.Univ Sci & Technol China, Sch Earth & Space Sci, Hefei 230026, Anhui, Peoples R China;
4.Deutsch GeoForschungsZentrum GFZ, D-14473 Potsdam, Germany;
5.Chinese Acad Sci, Inst Tibetan Plateau Res, Beijing 100101, Peoples R China;
6.China Univ Geosci, Sch Geophys & Informat Technol, Beijing 100083, Peoples R China.
Recommended Citation
GB/T 7714
He, P ,Lei, JS ,Yuan, XH ,et al. LateralMoho variations and the geometry of the Main Himalayan Thrust beneath the Nepal Himalayan orogen revealed by teleseismic receiver functions[J]. GEOPHYSICAL JOURNAL INTERNATIONAL,2018,214(2):1004-1017.
APA He, P .,Lei, JS .,Yuan, XH .,Xu, XW .,Xu, Q .,...&Zhou, LQ .(2018).LateralMoho variations and the geometry of the Main Himalayan Thrust beneath the Nepal Himalayan orogen revealed by teleseismic receiver functions.GEOPHYSICAL JOURNAL INTERNATIONAL,214(2),1004-1017.
MLA He, P ,et al."LateralMoho variations and the geometry of the Main Himalayan Thrust beneath the Nepal Himalayan orogen revealed by teleseismic receiver functions".GEOPHYSICAL JOURNAL INTERNATIONAL 214.2(2018):1004-1017.
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