Abstract
The instability region in anisotropic seabed to water waves has investigated to estimate from the five independent elastic parameters of anisotropic materials and coefficient of permeability. Especially, the phase delay, pore water pressures, effective normal stresses and shear stresses have been discussed. As the results of the analysis of the 2- and 3- dimensional stresses distribution, we have to not only judge the instability of the seabed by the area where the vertical effective stresses is negative. We also have to examine the conditions leading to the formation of non-vertical pulling destruction and shear destruction.
