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dc.contributor.author
Koelemeijer, Paula
dc.contributor.author
Deuss, Arwen
dc.contributor.author
Ritsema, Jeroen
dc.date.accessioned
2017-10-26T07:18:37Z
dc.date.available
2017-10-06T03:03:04Z
dc.date.available
2017-10-12T08:22:53Z
dc.date.available
2017-10-26T07:18:37Z
dc.date.issued
2017-05-15
dc.identifier.issn
2041-1723
dc.identifier.other
10.1038/ncomms15241
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/191294
dc.identifier.doi
10.3929/ethz-b-000191294
dc.description.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.
en_US
dc.format
application/pdf
dc.language.iso
en
en_US
dc.publisher
Nature Publishing Group
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/4.0/
dc.title
Density structure of Earth's lowermost mantle from Stoneley mode splitting observations
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 4.0 International
ethz.journal.title
Nature Communications
ethz.journal.volume
8
en_US
ethz.journal.abbreviated
Nat Commun
ethz.pages.start
15241
en_US
ethz.size
10 p.
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
London
en_US
ethz.publication.status
published
en_US
ethz.date.deposited
2017-10-06T03:03:06Z
ethz.source
WOS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2017-10-12T08:22:55Z
ethz.rosetta.lastUpdated
2021-02-14T19:43:56Z
ethz.rosetta.versionExported
true
ethz.COinS
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