The reliability of partly submerged production storage platforms deployed for the exploitation of geo-resources in deep and ultra-deep offshore locations is strongly influenced by the dynamic stability and performance of their foundation footings under hydrodynamic loading and external excitation. This paper presents an integral transform approach for investigating the effects of the three-dimensional motion of the gripping ocean bed subsoil layer under pressurized external excitation. For this, the fluid-foundation-soil dynamic interaction boundary value problem is modeled as an elastic plate on an elastic foundation. In particular, closed form expressions for the dynamic response profiles and the natural frequency of vibration as modulated by the ocean bed poro-mechanics are analysed and presented.

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