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Abstract <p>The northeastern Tibetan Plateau’s crustal structure remains poorly constrained, hindering our understanding of its tectonic evolution. To resolve uncertainties in the crustal structure of the northeastern Tibetan Plateau, a region critical for understanding continental deformation and tectonic evolution, this study integrates teleseismic receiver function inversion and deep seismic sounding (DSS) data to construct a high-resolution 3D S-wave velocity model that clarifies these uncertainties and offers new insights into the tectonic processes shaping the region. Key findings include: (1) Lateral heterogeneity: Pronounced velocity variations between tectonic blocks, with the Ordos and Alax blocks exhibiting stable, high-velocity crust, while orogens (Qilian, East Kunlun, and West Qinling) show low velocities and widespread low-velocity zones (LVZs). (2) Crustal thickening: Stepwise thickening from west to east, with the Qilian orogen reaching 60 km, while the West Qinling orogen thins to ~51 km. (3) LVZ distribution: Discontinuous LVZs beneath orogens, challenging the lower crustal flow model and supporting horizontal shortening as the primary deformation mechanism. These results provide critical insights into the crustal dynamics of the northeastern Tibetan Plateau, highlighting the role of lateral heterogeneity and LVZ distribution in controlling crustal deformation.</p> Highlights <p><UnorderedList Mark="Bullet"> <ItemContent> <p>A new 3D S-Wave velocity model reveals lateral heterogeneity and crustal thickness variations in the northeastern Tibetan Plateau.</p> </ItemContent> <ItemContent> <p>The research challenges the lower crustal flow model while supporting horizontal shortening as the primary deformation mechanism.</p> </ItemContent> <ItemContent> <p>Highlighting the role of low-velocity zones (LVZs) in controlling crustal deformation and uplift.</p> </ItemContent> </UnorderedList></p>

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3D crustal S-wave velocity structure beneath the NE Tibetan Plateau constrained by receiver function and deep seismic sounding data

  • 期刊论文

  • 发表日期：

    2025年7月29日

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  • Xianghui Song,
  • Shaofeng Liu,
  • Shuaijun Wang,
  • Zhanyong Gao,
  • Jiajia Song

摘要

Abstract

The northeastern Tibetan Plateau’s crustal structure remains poorly constrained, hindering our understanding of its tectonic evolution. To resolve uncertainties in the crustal structure of the northeastern Tibetan Plateau, a region critical for understanding continental deformation and tectonic evolution, this study integrates teleseismic receiver function inversion and deep seismic sounding (DSS) data to construct a high-resolution 3D S-wave velocity model that clarifies these uncertainties and offers new insights into the tectonic processes shaping the region. Key findings include: (1) Lateral heterogeneity: Pronounced velocity variations between tectonic blocks, with the Ordos and Alax blocks exhibiting stable, high-velocity crust, while orogens (Qilian, East Kunlun, and West Qinling) show low velocities and widespread low-velocity zones (LVZs). (2) Crustal thickening: Stepwise thickening from west to east, with the Qilian orogen reaching 60 km, while the West Qinling orogen thins to ~51 km. (3) LVZ distribution: Discontinuous LVZs beneath orogens, challenging the lower crustal flow model and supporting horizontal shortening as the primary deformation mechanism. These results provide critical insights into the crustal dynamics of the northeastern Tibetan Plateau, highlighting the role of lateral heterogeneity and LVZ distribution in controlling crustal deformation.

Highlights

A new 3D S-Wave velocity model reveals lateral heterogeneity and crustal thickness variations in the northeastern Tibetan Plateau.

The research challenges the lower crustal flow model while supporting horizontal shortening as the primary deformation mechanism.

Highlighting the role of low-velocity zones (LVZs) in controlling crustal deformation and uplift.