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Published as Geophysics, 82, U25-U35, (2017)

Diffraction imaging and time-migration velocity analysis using oriented velocity continuation

Luke Decker, Dmitrii Merzlikin, and Sergey Fomel


We perform seismic diffraction imaging and time-migration velocity analysis by separating diffractions from specular reflections and decomposing them into slope components. We image slope components using migration velocity extrapolation in time-space-slope coordinates. The extrapolation is described by a convection-type partial differential equation and implemented in a highly parallel manner in the Fourier domain. Synthetic and field data experiments show that the proposed algorithms are able to detect accurate time-migration velocities by measuring the flatness of diffraction events in slope gathers for both single and multiple offset data.