Linear approximations for VTI reflection coefficients are reviewed. Two methods are shown for improving on these coefficients. One is to incorporate the average angles in a manner analogous to the Aki-Richards approximation for isotropic coefficients. A second form is obtained through a reasonable guess based on optimal approximations for isotropic coefficients. Both of these methods yield more realistic coefficients than the purely linear approach, the latter having no critical behaviour.
View full article as PDF (0.17 Mb)