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Slab morphology and deformation beneath Izu-Bonin

Author

Listed:
  • Haijiang Zhang

    (University of Science and Technology of China
    CAS Center for Excellence in Comparative Planetology)

  • Fan Wang

    (University of Science and Technology of China
    Michigan State University, Natural Science Building)

  • Robert Myhill

    (University of Bristol)

  • Hao Guo

    (University of Science and Technology of China)

Abstract

Seismic tomography provides unique constraints on the morphology, the deformation, and (indirectly) the rheology of subducting slabs. We use teleseismic double-difference P-wave tomography to image with unprecedented clarity the structural complexity of the Izu-Bonin slab. We resolve a tear in the slab in the mantle transition zone (MTZ) between 26.5° N and 28° N. North of the tear, the slab is folded in the MTZ. Immediately above the fold hinge, a zone of reduced P-wavespeed may result from viscous dissipation within an incipient shear zone. To the south of the tear, the slab overturns and lies flat at the base of the MTZ. The ~680 km deep 2015 Bonin earthquake (Mw~7.9) is located at the northernmost edge of the overturning part of the slab. The localised tearing, shearing and buckling of the Izu-Bonin slab indicates that it remains highly viscous throughout the upper mantle and transition zone.

Suggested Citation

  • Haijiang Zhang & Fan Wang & Robert Myhill & Hao Guo, 2019. "Slab morphology and deformation beneath Izu-Bonin," Nature Communications, Nature, vol. 10(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-09279-7
    DOI: 10.1038/s41467-019-09279-7
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