Coupled flow and anisotropy in the UltraLow Velocity Zones. / Hier-Majumder, Saswata; Drombosky, Tyler.

In: Earth and Planetary Science Letters, Vol. 450, 15.09.2016, p. 274–282.

Research output: Contribution to journalArticlepeer-review

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Coupled flow and anisotropy in the UltraLow Velocity Zones. / Hier-Majumder, Saswata; Drombosky, Tyler.

In: Earth and Planetary Science Letters, Vol. 450, 15.09.2016, p. 274–282.

Research output: Contribution to journalArticlepeer-review

Harvard

Hier-Majumder, S & Drombosky, T 2016, 'Coupled flow and anisotropy in the UltraLow Velocity Zones', Earth and Planetary Science Letters, vol. 450, pp. 274–282. https://doi.org/10.1016/j.epsl.2016.06.023

APA

Hier-Majumder, S., & Drombosky, T. (2016). Coupled flow and anisotropy in the UltraLow Velocity Zones. Earth and Planetary Science Letters, 450, 274–282. https://doi.org/10.1016/j.epsl.2016.06.023

Vancouver

Hier-Majumder S, Drombosky T. Coupled flow and anisotropy in the UltraLow Velocity Zones. Earth and Planetary Science Letters. 2016 Sep 15;450:274–282. https://doi.org/10.1016/j.epsl.2016.06.023

Author

Hier-Majumder, Saswata ; Drombosky, Tyler. / Coupled flow and anisotropy in the UltraLow Velocity Zones. In: Earth and Planetary Science Letters. 2016 ; Vol. 450. pp. 274–282.

BibTeX

@article{d12deb91d4494dfbae6cb695ffb443a5,
title = "Coupled flow and anisotropy in the UltraLow Velocity Zones",
abstract = "Seismic observations reveal a patchwork of thin and dense structures, named UltraLow Velocity Zones (ULVZs) atop the Earth's core mantle boundary. The high width to height ratio of the ULVZs, their spatial correlation with the edges of Large Low Shear Velocity Provinces (LLSVPs), and their preservation as distinct structures in the convecting mantle remain an enigmatic problem. In this article, we carry out a series of numerical simulations using Fast Multipole Boundary Elements Method (FMBEM) to address these questions and study the internal deformation within the ULVZs. Our results demonstrate that coupled flow between dense, low viscosity ULVZ patches and the LLSVP accumulates the ULVZ into stable piles along LLSVP corners, while coalescence and gravitational drainage leads to thin and wide ULVZs away from the corners. Deformation of the matrix is localized within the weaker ULVZ and the LLSVP edges, while the strain in the interior of the LLSVP remains uniform and low, explaining the observed localized anisotropy near LLSVP edges.",
keywords = "Core-mantle boundary, two-phase flow, ULVZ, LLSVP, MANTLE HETEROGENEITY",
author = "Saswata Hier-Majumder and Tyler Drombosky",
year = "2016",
month = sep,
day = "15",
doi = "10.1016/j.epsl.2016.06.023",
language = "English",
volume = "450",
pages = "274–282",
journal = "Earth and Planetary Science Letters",
issn = "0012-821X",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - Coupled flow and anisotropy in the UltraLow Velocity Zones

AU - Hier-Majumder, Saswata

AU - Drombosky, Tyler

PY - 2016/9/15

Y1 - 2016/9/15

N2 - Seismic observations reveal a patchwork of thin and dense structures, named UltraLow Velocity Zones (ULVZs) atop the Earth's core mantle boundary. The high width to height ratio of the ULVZs, their spatial correlation with the edges of Large Low Shear Velocity Provinces (LLSVPs), and their preservation as distinct structures in the convecting mantle remain an enigmatic problem. In this article, we carry out a series of numerical simulations using Fast Multipole Boundary Elements Method (FMBEM) to address these questions and study the internal deformation within the ULVZs. Our results demonstrate that coupled flow between dense, low viscosity ULVZ patches and the LLSVP accumulates the ULVZ into stable piles along LLSVP corners, while coalescence and gravitational drainage leads to thin and wide ULVZs away from the corners. Deformation of the matrix is localized within the weaker ULVZ and the LLSVP edges, while the strain in the interior of the LLSVP remains uniform and low, explaining the observed localized anisotropy near LLSVP edges.

AB - Seismic observations reveal a patchwork of thin and dense structures, named UltraLow Velocity Zones (ULVZs) atop the Earth's core mantle boundary. The high width to height ratio of the ULVZs, their spatial correlation with the edges of Large Low Shear Velocity Provinces (LLSVPs), and their preservation as distinct structures in the convecting mantle remain an enigmatic problem. In this article, we carry out a series of numerical simulations using Fast Multipole Boundary Elements Method (FMBEM) to address these questions and study the internal deformation within the ULVZs. Our results demonstrate that coupled flow between dense, low viscosity ULVZ patches and the LLSVP accumulates the ULVZ into stable piles along LLSVP corners, while coalescence and gravitational drainage leads to thin and wide ULVZs away from the corners. Deformation of the matrix is localized within the weaker ULVZ and the LLSVP edges, while the strain in the interior of the LLSVP remains uniform and low, explaining the observed localized anisotropy near LLSVP edges.

KW - Core-mantle boundary

KW - two-phase flow

KW - ULVZ

KW - LLSVP

KW - MANTLE HETEROGENEITY

U2 - 10.1016/j.epsl.2016.06.023

DO - 10.1016/j.epsl.2016.06.023

M3 - Article

VL - 450

SP - 274

EP - 282

JO - Earth and Planetary Science Letters

JF - Earth and Planetary Science Letters

SN - 0012-821X

ER -