Interactions of multi-scale heterogeneity in the lithosphere: Australia

dc.contributor.authorKennett, B. L. N.
dc.contributor.authorYoshizawa, K.
dc.contributor.authorFurumura, T.
dc.date.accessioned2018-01-10T01:02:54Z
dc.date.issued2017
dc.description.abstractUnderstanding the complex heterogeneity of the continental lithosphere involves a wide variety of spatial scales and the synthesis of multiple classes of information. Seismic surface waves and multiply reflected body waves provide the main constraints on broad-scale structure, and bounds on the extent of the lithosphere-asthenosphere transition (LAT) can be found from the vertical gradients of S wavespeed. Information on finer-scale structures comes through body wave studies, including detailed seismic tomography and P-wave reflectivity extracted from stacked autocorrelograms of continuous component records. With the inclusion of deterministic large-scale structure and realistic medium-scale stochastic features fine-scale variations are subdued. The resulting multi-scale heterogeneity model for the Australian region gives a good representation of the character of observed seismograms and their geographic variations and matches the observations of P-wave reflectivity. P reflections in the 0.5–3.0 Hz band in the uppermost mantle suggest variations on vertical scales of a few hundred metres with amplitudes of the order of 1%. Interference of waves reflected or converted at sequences of such modest variations in physical properties produce relatively simple behaviour for lower frequencies, which can suggest simpler structures than are actually present. Vertical changes in the character of fine-scale heterogeneity can produce apparent discontinuities. In Central Australia a ‘mid-lithospheric discontinuity’ can be tracked via changes in frequency content of station reflectivity, with links to the broad-scale pattern of wavespeed gradients and, in particular, the gradients of radial anisotropy. Comparisons with xenolith results from southeastern Australia indicate a strong tie between geochemical stratification and P-wave reflectivity.en_AU
dc.description.sponsorshipPart of this study was supported by JSPS KAKENHI Grant Number 26400443 to K.Y., with additional support from the AuScope AuSREM project. The Earth Simulator Center of JAMSTEC is thanked for providing CPU time on the Earth Simulator.en_AU
dc.format.mimetypeapplication/pdfen_AU
dc.identifier.issn0040-1951en_AU
dc.identifier.urihttp://hdl.handle.net/1885/139144
dc.provenancehttp://www.sherpa.ac.uk/romeo/issn/0040-1951/..."Author's post-print on open access repository after an embargo period of between 12 months and 48 months" from SHERPA/RoMEO site (as at 10/01/18).
dc.publisherElsevieren_AU
dc.rights© 2017 Elsevier B.V.en_AU
dc.sourceTectonophysicsen_AU
dc.subjectMulti-scale heterogeneityen_AU
dc.subjectLithosphere-asthenosphere transitionen_AU
dc.subjectLithospheric reflectivityen_AU
dc.subjectFine-scale structureen_AU
dc.subjectRadial anisotropyen_AU
dc.titleInteractions of multi-scale heterogeneity in the lithosphere: Australiaen_AU
dc.typeJournal articleen_AU
dcterms.accessRightsOpen Accessen_AU
local.bibliographicCitation.lastpage213en_AU
local.bibliographicCitation.startpage193en_AU
local.contributor.affiliationKennett, B. L. N., Research School of Earth Sciences, The Australian National Universityen_AU
local.contributor.authoremailu8413736@anu.edu.auen_AU
local.contributor.authoruidu8413736en_AU
local.identifier.citationvolume717en_AU
local.identifier.doi10.1016/j.tecto.2017.07.009en_AU
local.identifier.uidSubmittedByu1005913en_AU
local.publisher.urlhttps://www.elsevier.com/en_AU
local.type.statusAccepted Versionen_AU

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