LateralMoho variations and the geometry of the Main Himalayan Thrust beneath the Nepal Himalayan orogen revealed by teleseismic receiver functions

被引:27
|
作者
He, Ping [1 ,2 ,3 ]
Lei, Jianshe [2 ]
Yuan, Xiaohui [4 ]
Xu, Xiwei [2 ]
Xu, Qiang [5 ]
Liu, Zhikun [6 ]
Mi, Qi [2 ]
Zhou, Lianqing [1 ]
机构
[1] 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
基金
国家重点研发计划;
关键词
Receiver function; Nepal Himalayan orogen; Moho variations; Main Himalayan Thrust; the 2015 Gorkha earthquake; 2015 GORKHA EARTHQUAKE; INDIAN LITHOSPHERE BENEATH; PN ANISOTROPIC TOMOGRAPHY; SOUTHERN TIBET; CRUSTAL STRUCTURE; COLLISION ZONE; STEEP SUBDUCTION; PLATE BENEATH; WESTERN TIBET; SEISMIC CYCLE;
D O I
10.1093/gji/ggy192
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
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.
引用
收藏
页码:1004 / 1017
页数:14
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