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Journal Article

Underthrusting and Pure Shear Mechanisms Dominate the Crustal Deformation Beneath the Core of the Eastern Himalayan Syntaxis as Inferred From High‐Resolution Receiver Function Imaging

Authors

Xu,  Qiang
External Organizations;

Ding,  Lin
External Organizations;

Pei,  Shunping
External Organizations;

/persons/resource/yuan

Yuan,  X.
2.4 Seismology, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Zhao,  Junmeng
External Organizations;

Liu,  Hongbing
External Organizations;

Liu,  Hanlin
External Organizations;

Li,  Lei
External Organizations;

Zuo,  Hong
External Organizations;

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Fulltext (public)

5015198.pdf
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Citation

Xu, Q., Ding, L., Pei, S., Yuan, X., Zhao, J., Liu, H., Liu, H., Li, L., Zuo, H. (2022): Underthrusting and Pure Shear Mechanisms Dominate the Crustal Deformation Beneath the Core of the Eastern Himalayan Syntaxis as Inferred From High‐Resolution Receiver Function Imaging. - Geophysical Research Letters, 49, 24, e2022GL101697.
https://doi.org/10.1029/2022GL101697


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5015198
Abstract
How the crust in the core of the Eastern Himalayan Syntaxis (EHS) deforms responding to the India-Asia collision remains ambiguous. Here we present the first high-resolution receiver functions image of crustal structure along a new NW-SE trending dense nodal array crossing the core of the EHS. Two sets of low velocity zones (LVZs) are clearly observed: one with a flat style beneath the western Lhasa terrane and Higher Himalaya at 18–20 km depth and the other with two west-dipping shapes below the western Yarlung-Zangbo suture within 10–30 km depth. These LVZs caused by partial melting and aqueous fluids are disconnected, impeding the formation of crustal flow. A discontinuous east-dipping intra-crustal discontinuity and a sharp Moho offset of 7 km under the Aniqiao-Motuo shear zone are identified, suggesting that the underthrusting of the Indian lower crust and pure shear mechanisms jointly dominate crustal deformation in the core of the EHS.