Wave propagation in layered dry, saturated and unsaturated poroelastic media

An exact sti}ness formalism is presented to study harmonic and transient wave propa! gation in multilayered dry\ saturated and unsaturated isotropic poroelastic media[ Smeulders| extension of Biot|s poroelastic theory is used to incorporate unsaturated porous media with a small gas fraction[ A wide range of problems in geophysical and civil engineering can be treated\ ranging from ampli_cation of plane harmonic waves\ dispersion and attenuation of surface waves to transient wave propagation due to a forced excitation[ The e}ect of full or partial saturation on wave propagation in a poroelastic layered halfspace is demonstrated in a numerical example\ in which the layering is caused by a moving ground water table[ 0887 Elsevier Science[ All rights reserved