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Vertical tearing of subducting plates controlled by geometry and rheology of oceanic plates

Author

Listed:
  • Yaguang Chen

    (Zhejiang University
    Institute of Geophysics, ETH Zürich)

  • Hanlin Chen

    (Zhejiang University)

  • Mingqi Liu

    (Institute of Geophysics, ETH Zürich)

  • Taras Gerya

    (Institute of Geophysics, ETH Zürich)

Abstract

Lateral non-uniform subduction is impacted by continuous plate segmentation owing to vertical tearing of the subducting plate. However, the dynamics and physical controls of vertical tearing remain controversial. Here, we employed 3D numerical models to investigate the effects of trench geometry (offset by a transform boundary) and plate rheology (plate age and the magnitude of brittle/plastic strain weakening) on the evolution of shear stress-controlled vertical tearing within a homogenous subducting oceanic plate. Numerical results suggest that the trench offset geometry could result in self-sustained vertical tearing as a narrow shear zone within the intact subducting oceanic plate, and that this process of tearing could operate throughout the entire subduction process. Further, the critical trench offset length for the maturation of vertical tearing is impacted by plate rheology. Comparison between numerical modelling results and natural observations suggests that vertical tearing attributed to trench offset geometry is broadly developed in modern subduction and collision systems worldwide.

Suggested Citation

  • Yaguang Chen & Hanlin Chen & Mingqi Liu & Taras Gerya, 2023. "Vertical tearing of subducting plates controlled by geometry and rheology of oceanic plates," Nature Communications, Nature, vol. 14(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-43804-z
    DOI: 10.1038/s41467-023-43804-z
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    References listed on IDEAS

    as
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