Matches in SemOpenAlex for { <https://semopenalex.org/work/W2614329465> ?p ?o ?g. }
- W2614329465 abstract "Abstract Advances in our understanding of Earth’s thermal evolution and the style of mantle convection rely on robust seismological constraints on lateral variations of density. The large-low-shear-wave velocity provinces (LLSVPs) atop the core–mantle boundary beneath Africa and the Pacific are the largest structures in the lower mantle, and hence severely affect the convective flow. Here, we show that anomalous splitting of Stoneley modes, a unique class of free oscillations that are perturbed primarily by velocity and density variations at the core–mantle boundary, is explained best when the overall density of the LLSVPs is lower than the surrounding mantle. The resolved density variations can be explained by the presence of post-perovskite, chemical heterogeneity or a combination of the two. Although we cannot rule out the presence of a ∼100-km-thick denser-than-average basal structure, our results support the hypothesis that LLSVPs signify large-scale mantle upwelling in two antipodal regions of the mantle." @default.
- W2614329465 created "2017-05-26" @default.
- W2614329465 creator A5032781303 @default.
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- W2614329465 date "2017-05-15" @default.
- W2614329465 modified "2023-09-25" @default.
- W2614329465 title "Density structure of Earth’s lowermost mantle from Stoneley mode splitting observations" @default.
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- W2614329465 doi "https://doi.org/10.1038/ncomms15241" @default.
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