e t F c c u

ethod for numerical, full-viscoelastic wave modeling, more accu-lar grid Hestholm, 2002, equations 1–18. Boundary conditions Hestholm and Ruud, 2002 in the velocity-stress formulation are implemented at the top of the numerical grid, and absorbing bound-aries Cerjan et al., 1985 from the remaining boundaries. Numerical simulation of a marine seismic experiment is then presented to illus-trate how important the inclusion of viscoelasticity may be, even in a marine environment.uick and accurate Q parameterizat tig Hestholm1, Stephen Ketcham2, Roy Gre We introduce a procedure for including the attenuation factor Q in a consistent manner in seismic modeling and show 3D examples. The Q fitting over a chosen frequency band involves two algorithms: The first creates starting val-ues of relaxation times, and the second does nonlinear inver