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dc.contributor.authorChoi, Yun Seok
dc.contributor.authorAlkhalifah, Tariq Ali
dc.date.accessioned2015-08-03T09:02:18Z
dc.date.available2015-08-03T09:02:18Z
dc.date.issued2011-01
dc.identifier.issn10523812
dc.identifier.doi10.1190/1.3627727
dc.identifier.urihttp://hdl.handle.net/10754/561687
dc.description.abstractPhase wrapping in the frequency-domain (or cycle skipping in the time-domain) is the major cause of the local minima problem in the waveform inversion. The unwrapped phase has the potential to provide us with a robust and reliable waveform inversion, with reduced local minima. We propose a waveform inversion algorithm using the unwrapped phase objective function in the frequency-domain. The unwrapped phase, or what we call the instantaneous traveltime, is given by the imaginary part of dividing the derivative of the wavefield with respect to the angular frequency by the wavefield itself. As a result, the objective function is given a traveltime-like function, which allows us to smooth it and reduce its nonlinearity. The gradient of the objective function is computed using the back-propagation algorithm based on the adjoint-state technique. We apply both our waveform inversion algorithm using the unwrapped phase and the conventional waveform inversion and show that our inversion algorithm gives better convergence to the true model than the conventional waveform inversion. © 2011 Society of Exploration Geophysicists.
dc.publisherSociety of Exploration Geophysicists
dc.subjectFrequency-domain
dc.subjectFull waveform inversion
dc.subjectOptimization
dc.subjectPhase
dc.subjectTraveltime
dc.titleFrequency-domain waveform inversion using the unwrapped phase
dc.typeArticle
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Division
dc.contributor.departmentEarth Science and Engineering Program
dc.contributor.departmentEnvironmental Science and Engineering Program
dc.identifier.journalSEG Technical Program Expanded Abstracts 2011
kaust.personChoi, Yun Seok
kaust.personAlkhalifah, Tariq Ali


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