Slab morphology and deformation beneath Izu-Bonin

Haijiang Zhang; Fan Wang; Robert Myhill; Hao Guo

doi:10.1038/s41467-019-09279-7

Slab morphology and deformation beneath Izu-Bonin

Haijiang Zhang^*, Fan Wang, Robert Myhill, Hao Guo

^*Corresponding author for this work

School of Earth Sciences

Research output: Contribution to journal › Article (Academic Journal) › peer-review

17 Citations (Scopus)

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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.

Original language	English
Article number	1310
Journal	Nature Communications
Volume	10
Issue number	1
DOIs	https://doi.org/10.1038/s41467-019-09279-7
Publication status	Published - 21 Mar 2019

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Dr Robert C Myhill
- bob.myhill@bristol.ac.uk
- School of Earth Sciences - Senior Research Associate
Person: Academic

Cite this

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Slab morphology and deformation beneath Izu-Bonin

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Dr Robert C Myhill

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