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Attenuation tomography of the upper inner core

Pejic, Tanja; Tkalcic, Hrvoje; Sambridge, Malcolm; Cormier, Vernon F; Benavente, Roberto

Description

The solidification of the Earth's inner core shapes its texture and rheology, affecting the attenuation and scattering of seismic body waves transmitted through it. Applying attenuation tomography in a Bayesian framework to 398 high-quality PKIKP waveforms, we invert for the apparent Qp for the uppermost 400 km below the inner core boundary at latitudes 45°S to 45°N. We use damping and smoothing for regularization of the inversion, and it seems that the smoothing regularization combined with...[Show more]

dc.contributor.authorPejic, Tanja
dc.contributor.authorTkalcic, Hrvoje
dc.contributor.authorSambridge, Malcolm
dc.contributor.authorCormier, Vernon F
dc.contributor.authorBenavente, Roberto
dc.date.accessioned2021-05-11T03:55:04Z
dc.date.available2021-05-11T03:55:04Z
dc.identifier.issn2169-9313
dc.identifier.urihttp://hdl.handle.net/1885/232626
dc.description.abstractThe solidification of the Earth's inner core shapes its texture and rheology, affecting the attenuation and scattering of seismic body waves transmitted through it. Applying attenuation tomography in a Bayesian framework to 398 high-quality PKIKP waveforms, we invert for the apparent Qp for the uppermost 400 km below the inner core boundary at latitudes 45°S to 45°N. We use damping and smoothing for regularization of the inversion, and it seems that the smoothing regularization combined with the discrepancy principle works better for this particular problem of attenuation tomography. The results are consistent with a regional variation in inner core attenuation more complex than hemispherical, suggesting coupling between inner core solidification and the thermal structure of the lowermost mantle
dc.description.sponsorshipThe IRIS DS is fundedthrough the National ScienceFoundation and specifically theGEO Directorate through theInstrumentation and Facilities Programof the National Science Foundationunder cooperative AgreementEAR-0004370
dc.format.mimetypeapplication/pdf
dc.language.isoen_AU
dc.publisherWiley Blackwell
dc.rights© 2017. American Geophysical Union
dc.sourceJournal of Geophysical Research: Solid Earth
dc.source.urihttps://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/2016JB013692
dc.titleAttenuation tomography of the upper inner core
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume122
dc.date.issued2017
local.identifier.absfor040400 - GEOPHYSICS
local.identifier.ariespublicationa383154xPUB5793
local.publisher.urlhttps://agupubs.onlinelibrary.wiley.com
local.type.statusPublished Version
local.contributor.affiliationPejic, Tanja, College of Science, ANU
local.contributor.affiliationTkalcic, Hrvoje, College of Science, ANU
local.contributor.affiliationSambridge, Malcolm, College of Science, ANU
local.contributor.affiliationCormier, Vernon F, University of Connecticut
local.contributor.affiliationBenavente, Roberto, College of Science, ANU
local.bibliographicCitation.issue4
local.bibliographicCitation.startpage3008
local.bibliographicCitation.lastpage3032
local.identifier.doi10.1002/2016JB013692
local.identifier.absseo970104 - Expanding Knowledge in the Earth Sciences
dc.date.updated2020-11-23T10:13:12Z
local.identifier.scopusID2-s2.0-85018352937
local.identifier.thomsonID000401867200032
dcterms.accessRightsopen access
dc.provenancehttps://v2.sherpa.ac.uk/id/publication/11081..."author can archive publisher's version/PDF" from SHERPA/RoMEO site as at 11/05/2021
CollectionsANU Research Publications

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