Scattering angle base filtering of the inversion gradients

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

Full waveform inversion (FWI) requires a hierarchical approach based on the availability of low frequencies to maneuver the complex nonlinearity associated with the problem of velocity inversion. I develop a model gradient filter to help us access the parts of the gradient more suitable to combat this potential nonlinearity. The filter is based on representing the gradient in the time-lag normalized domain, in which low scattering angles of the gradient update are initially muted. The result are long-wavelength updates controlled by the ray component of the wavefield. In this case, even 10 Hz data can produce near zero wavelength updates suitable for a background correction of the model. Allowing smaller scattering angle to contribute provides higher resolution information to the model.
Original languageEnglish (US)
Title of host publicationProceedings 76th EAGE Conference and Exhibition 2014
PublisherEAGE Publications
ISBN (Print)9781632666949
DOIs
StatePublished - 2014

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