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dc.contributor.authorAlkhalifah, Tariq Ali
dc.date.accessioned2015-05-25T11:54:22Z
dc.date.available2015-05-25T11:54:22Z
dc.date.issued2014-11-21
dc.identifier.citationScattering-angle based filtering of the waveform inversion gradients 2014, 200 (1):363 Geophysical Journal International
dc.identifier.issn0956-540X
dc.identifier.issn1365-246X
dc.identifier.doi10.1093/gji/ggu379
dc.identifier.urihttp://hdl.handle.net/10754/555681
dc.description.abstractFull waveform inversion (FWI) requires a hierarchical approach to maneuver the complex non-linearity associated with the problem of velocity update. In anisotropic media, the non-linearity becomes far more complex with the potential trade-off between the multiparameter description of the model. A gradient filter helps us in accessing the parts of the gradient that are suitable to combat the potential non-linearity and parameter trade-off. The filter is based on representing the gradient in the time-lag normalized domain, in which the low scattering angle of the gradient update is initially muted out in the FWI implementation, in what we may refer to as a scattering angle continuation process. The result is a low wavelength update dominated by the transmission part of the update gradient. In this case, even 10 Hz data can produce vertically near-zero wavenumber updates suitable for a background correction of the model. Relaxing the filtering at a later stage in the FWI implementation allows for smaller scattering angles to contribute higher-resolution information to the model. The benefits of the extended domain based filtering of the gradient is not only it's ability in providing low wavenumber gradients guided by the scattering angle, but also in its potential to provide gradients free of unphysical energy that may correspond to unrealistic scattering angles.
dc.publisherOxford University Press (OUP)
dc.relation.urlhttp://gji.oxfordjournals.org/cgi/doi/10.1093/gji/ggu379
dc.rightsArchived with thanks to Geophysical Journal International
dc.subjectInverse theory
dc.subjectSeismic tomography
dc.subjectAcoustic properties
dc.titleScattering-angle based filtering of the waveform inversion gradients
dc.typeArticle
dc.contributor.departmentEarth Science and Engineering Program
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.contributor.departmentSeismic Wave Analysis Group
dc.identifier.journalGeophysical Journal International
dc.eprint.versionPublisher's Version/PDF
kaust.personAlkhalifah, Tariq Ali
refterms.dateFOA2018-06-14T07:57:32Z
dc.date.published-online2014-11-21
dc.date.published-print2014-01-01


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