3D frequency-domain finite-difference viscoelastic-wave modeling using weighted average 27-point operators with optimal coefficients

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Fast 3D frequency-domain full-waveform inversion with a parallel block low-rank multifrontal direct solver: Application to OBC data from the North Sea (2016, background): “…accurate stencils that are built by discretizing the differential operators on different coordinate systems with a spreading of the mass term over the coefficients of the stencil (Jo et al., 1996; Stekl and Pratt, 1998; Min et al., 2000; Hustedt et al., 2004; Gosselin-Cliche and Giroux, 2014).”