|Modeling of pseudo-acoustic P-waves in orthorhombic media with a lowrank approximation|
We derive and adopt a dispersion relation for acoustic orthorhombic media so as to model seismic wavefields in such media. To handle the space-wavenumber mixed-domain operator, we apply the lowrank approximation to reduce computational cost. Numerical experiments show that the proposed wavefield extrapolator is accurate. There is no coupling of qSV and qP in the wavefield snapshots because we use the dispersion relation. In addition, our approach yields practically dispersion-free wavefields, and it is also free of stability limitations on media parameters.