A Possible Roll-over Slab Geometry under the Caroline Plate Imaged by Monte Carlo Finite-Frequency Traveltime Inversion of Teleseismic SS Phases - Archive ouverte HAL Access content directly
Journal Articles Frontiers in Earth Science Year : 2021

A Possible Roll-over Slab Geometry under the Caroline Plate Imaged by Monte Carlo Finite-Frequency Traveltime Inversion of Teleseismic SS Phases

(1) , , ,
1
Nobuaki Fuji
Hyoihn Jang
  • Function : Author
Atsushi Nakao
  • Function : Author
Younghee Kim
  • Function : Author

Abstract

The shape of a subducting slab varies as a function of trench motion. Two end-members of subduction modes are geodynamically possible: roll-back mode underneath neighboring plates and roll-over mode underneath the plate itself. Whereas most of major slabs seem to roll back while the Pacific plate shows a slab piling behavior down to ~1,000 km depth under the Mariana trench, no clear evidence of slab roll-over in nature has been reported so far. Here we show a possible roll-over slab beneath the Caroline microplate, revealed from its three-dimensional seismic velocity structure derived by analyzing teleseismic reverberating SS phases. We suggest that slab roll-over is driven by at least two factors: i) the overall buoyancy and fragility of the Caroline microplate at the surface, induced by a thin hot mantle plume that rises from depths ≥800 km; and ii) the pushing force of the Pacific plate acting on the trailing edge of the Caroline plate.
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insu-03590085 , version 1 (26-02-2022)

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Attribution - CC BY 4.0

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Nobuaki Fuji, Hyoihn Jang, Atsushi Nakao, Younghee Kim. A Possible Roll-over Slab Geometry under the Caroline Plate Imaged by Monte Carlo Finite-Frequency Traveltime Inversion of Teleseismic SS Phases. Frontiers in Earth Science, 2021, 9, p. 210-225. ⟨10.3389/feart.2021.593947⟩. ⟨insu-03590085⟩
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