Transient diffraction of a plane, dilatational pulse of arbitrary shape is considered. The diffracting surface is a smooth, rigid barrier separating a semi-infinite elastic solid and a semi-infinite ideal fluid over half of the common boundary. The problem is solved by the Wiener-Hopf technique, in conjunction with a superposition principle and a version of Cagniard’s method. Real integral expressions are obtained for the displacement potentials in the solid and in the fluid. For an incident displacement impulse, closed-form expressions are derived for the displacement field. For this case, the displacements at the solid-fluid interface are shown in graphs and are compared with the corresponding surface displacements when the fluid is absent.

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