The shear modulus of a seabed is an important soil parameter in the analysi
s of the wave-seabed interaction problem. However, most previous investigat
ions have only considered a porous seabed with uniform shear modulus, despi
te strong evidence of shear modulus varying with soil depth have been repor
ted in the literature. In this study, the seabed is treated as varying line
arly with soil depth (i.e., Gibson soil). The wave-induced seabed response
is found to be affected significantly by variable shear modulus.