Wavefield extrapolation in pseudodepth domain

Wavefield extrapolation in pseudodepth domain

Xuxin Ma and Tariq Alkhalifah, "Wavefield extrapolation in pseudodepth domain", Geophysics 78 (2013): S81-S91. doi: 10.1190/geo2012-0237.1.
Xuxin Ma, Tariq Alkhalifah
Reverse time migration, wave equation, wave propagation, imaging
2013
​Wavefields are commonly computed in the Cartesian coordinate frame. Its efficiency is inherently limited due to spatial oversampling in deep layers, where the velocity is high and wavelengths are long. To alleviate this computational waste due to uneven wavelength sampling, we convert the vertical axis of the conventional domain from depth to vertical time or pseudodepth. This creates a nonorthognal Riemannian coordinate system. Isotropic and anisotropic wavefields can be extrapolated in the new coordinate frame with improved efficiency and good consistency with Cartesian domain extrapolation results. Prestack depth migrations are also evaluated based on the wavefield extrapolation in the pseudodepth domain.
(print): 0016-8033 (online): 1942-2156