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dc.contributor.authorWu, Zedong
dc.contributor.authorAlkhalifah, Tariq Ali
dc.date.accessioned2017-10-03T12:49:32Z
dc.date.available2017-10-03T12:49:32Z
dc.date.issued2017-07-07
dc.identifier.citationWu Z, Alkhalifah T (2017) Efficient scattering-angle enrichment for a nonlinear inversion of the background and perturbations components of a velocity model. Geophysical Journal International 210: 1981–1992. Available: http://dx.doi.org/10.1093/gji/ggx283.
dc.identifier.issn0956-540X
dc.identifier.issn1365-246X
dc.identifier.doi10.1093/gji/ggx283
dc.identifier.urihttp://hdl.handle.net/10754/625659
dc.description.abstractReflection-waveform inversion (RWI) can help us reduce the nonlinearity of the standard full-waveform inversion (FWI) by inverting for the background velocity model using the wave-path of a single scattered wavefield to an image. However, current RWI implementations usually neglect the multi-scattered energy, which will cause some artifacts in the image and the update of the background. To improve existing RWI implementations in taking multi-scattered energy into consideration, we split the velocity model into background and perturbation components, integrate them directly in the wave equation, and formulate a new optimization problem for both components. In this case, the perturbed model is no longer a single-scattering model, but includes all scattering. Through introducing a new cheap implementation of scattering angle enrichment, the separation of the background and perturbation components can be implemented efficiently. We optimize both components simultaneously to produce updates to the velocity model that is nonlinear with respect to both the background and the perturbation. The newly introduced perturbation model can absorb the non-smooth update of the background in a more consistent way. We apply the proposed approach on the Marmousi model with data that contain frequencies starting from 5 Hz to show that this method can converge to an accurate velocity starting from a linearly increasing initial velocity. Also, our proposed method works well when applied to a field data set.
dc.publisherOxford University Press (OUP)
dc.relation.urlhttps://academic.oup.com/gji/article-abstract/doi/10.1093/gji/ggx283/3933235/Efficient-scattering-angle-enrichment-for-a?redirectedFrom=fulltext
dc.subjectFull waveform inversion
dc.subjectAcoustic
dc.titleEfficient scattering-angle enrichment for a nonlinear inversion of the background and perturbations components of a velocity model
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
kaust.personWu, Zedong
kaust.personAlkhalifah, Tariq Ali
dc.date.published-online2017-07-07
dc.date.published-print2017-09


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