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  The velocity structure and crustal anisotropy in the lithosphere-asthenosphere system of the Himalayan orogen and its adjacent areas

Zhang, X., Yang, Z., Yang, Y., Du, G., Yang, W., Shi, H., Zou, L., Liu, J. (2023): The velocity structure and crustal anisotropy in the lithosphere-asthenosphere system of the Himalayan orogen and its adjacent areas, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-1451

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Item Permalink: https://gfzpublic.gfz.de/pubman/item/item_5017149 Version Permalink: https://gfzpublic.gfz.de/pubman/item/item_5017149_1
Genre: Conference Paper

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 Creators:
Zhang, Xuemei1, Author
Yang, Zhigao1, Author
Yang, Yihai1, Author
Du, Guangbao1, Author
Yang, Wen1, Author
Shi, Haixia1, Author
Zou, Liye1, Author
Liu, Jie1, Author
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

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 Abstract: Tethyan oceanic subduction, terrane accretion and continental collision of the Indian and Eurasian plates since 50Ma ago lead to the current Himalayan orogen. As imagined from geophysical data, the deep structure and anisotropy of the lithosphere-asthenosphere system provides important clues in understanding the modality of the orogenic convergence and collision. Based on the seismic data from CENC, IRIS and ISC, using surface wave tomography, we calculated the group velocity. Base on Metropolis rule, we improved the simulated annealing algorithm to simultaneously inverse the velocities and thicknesses and identified the Moho depth and the bottom of lithosphere. We computed receiver functions at permanent and portables stations to provide constrains for crustal deformation. A harmonic analysis was employed to investigate the accurate crustal anisotropy. Crustal shortening and thickening should have occurred beneath the study region. Its partial melting might have enhanced the crustal anisotropy and promoted the accumulation and release of strain. The Himalayan block (HM) is covered by a high velocity anomsaly of about 5% indicating a relatively thin asthenosphere with high velocity. The Vs models demonstrate the leading edge of the subducting Indian slab reaches up to Bangong-Nujiang suture belt (BNS). It indicated that the crust with the thickness of about 65 km in HM and the lithosphere ( ~160 km). The epicenters in HM is relatively deeper than that northern BNS, more deep focus earthquakes are located in the uppermost mantle. The study is supported by the Chinese National Science Foundation (41774069).

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Language(s): eng - English
 Dates: 2023
 Publication Status: Finally published
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 Identifiers: DOI: 10.57757/IUGG23-1451
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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Place of Event: Berlin
Start-/End Date: 2023-07-11 - 2023-07-20

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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Source Genre: Proceedings
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Publ. Info: Potsdam : GFZ German Research Centre for Geosciences
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