Slab Control on the Northeastern Edge of the Mid-Pacific LLSVP Near Hawaii

D. Sun; D. Helmberger; V. H. Lai; M. Gurnis; J. M. Jackson; H. Y. Yang

doi:10.1029/2018GL081130

Slab Control on the Northeastern Edge of the Mid-Pacific LLSVP Near Hawaii

D. Sun^*, D. Helmberger, V. H. Lai, M. Gurnis, J. M. Jackson, H. Y. Yang

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

30 Citations (Scopus)

Abstract

At the core-mantle boundary, most observed ultralow velocity zones (ULVZs) cluster along the edges of the large low shear velocity provinces (LLSVPs) and provide key information on the composition, dynamics, and evolution of the lower mantle. However, their detailed structure near slab-like structures beneath the mid-Pacific remains particularly challenging because of the lack of station coverage. While most studies of ULVZs concentrate on SKS-complexity, here we report on the multipathing of ScS, which expands the sampling for ULVZs. We find the strongest multipathing along a ULVZ patch located just south of Hawaii and the far northeastern edge of the LLSVP, in a zone ~200 km in width and extending 600 km southward. The anomalous ScS travel times and distorted S_diff waveforms further reveal patches interrupted by observed enhanced D″ indicative of slab-debris influence on the complexity of the northeastern boundary of the mid-Pacific LLSVP.

Original language	English
Pages (from-to)	3142-3152
Number of pages	11
Journal	Geophysical Research Letters
Volume	46
Issue number	6
DOIs	https://doi.org/10.1029/2018GL081130
Publication status	Published - 28 Mar 2019
Externally published	Yes

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title = "Slab Control on the Northeastern Edge of the Mid-Pacific LLSVP Near Hawaii",

abstract = "At the core-mantle boundary, most observed ultralow velocity zones (ULVZs) cluster along the edges of the large low shear velocity provinces (LLSVPs) and provide key information on the composition, dynamics, and evolution of the lower mantle. However, their detailed structure near slab-like structures beneath the mid-Pacific remains particularly challenging because of the lack of station coverage. While most studies of ULVZs concentrate on SKS-complexity, here we report on the multipathing of ScS, which expands the sampling for ULVZs. We find the strongest multipathing along a ULVZ patch located just south of Hawaii and the far northeastern edge of the LLSVP, in a zone ~200 km in width and extending 600 km southward. The anomalous ScS travel times and distorted Sdiff waveforms further reveal patches interrupted by observed enhanced D″ indicative of slab-debris influence on the complexity of the northeastern boundary of the mid-Pacific LLSVP.",

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AU - Sun, D.

AU - Helmberger, D.

AU - Lai, V. H.

AU - Gurnis, M.

AU - Jackson, J. M.

AU - Yang, H. Y.

PY - 2019/3/28

Y1 - 2019/3/28

N2 - At the core-mantle boundary, most observed ultralow velocity zones (ULVZs) cluster along the edges of the large low shear velocity provinces (LLSVPs) and provide key information on the composition, dynamics, and evolution of the lower mantle. However, their detailed structure near slab-like structures beneath the mid-Pacific remains particularly challenging because of the lack of station coverage. While most studies of ULVZs concentrate on SKS-complexity, here we report on the multipathing of ScS, which expands the sampling for ULVZs. We find the strongest multipathing along a ULVZ patch located just south of Hawaii and the far northeastern edge of the LLSVP, in a zone ~200 km in width and extending 600 km southward. The anomalous ScS travel times and distorted Sdiff waveforms further reveal patches interrupted by observed enhanced D″ indicative of slab-debris influence on the complexity of the northeastern boundary of the mid-Pacific LLSVP.

AB - At the core-mantle boundary, most observed ultralow velocity zones (ULVZs) cluster along the edges of the large low shear velocity provinces (LLSVPs) and provide key information on the composition, dynamics, and evolution of the lower mantle. However, their detailed structure near slab-like structures beneath the mid-Pacific remains particularly challenging because of the lack of station coverage. While most studies of ULVZs concentrate on SKS-complexity, here we report on the multipathing of ScS, which expands the sampling for ULVZs. We find the strongest multipathing along a ULVZ patch located just south of Hawaii and the far northeastern edge of the LLSVP, in a zone ~200 km in width and extending 600 km southward. The anomalous ScS travel times and distorted Sdiff waveforms further reveal patches interrupted by observed enhanced D″ indicative of slab-debris influence on the complexity of the northeastern boundary of the mid-Pacific LLSVP.

KW - ScS

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DO - 10.1029/2018GL081130

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EP - 3152

JO - Geophysical Research Letters

JF - Geophysical Research Letters

IS - 6

ER -

Slab Control on the Northeastern Edge of the Mid-Pacific LLSVP Near Hawaii

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