ABSTRACT
ABSTRACT: A seaquake, caused by an earthquake, is shaking experienced on board a floating structure at sea. The shaking is most often felt as strong vertical impact, but its generation mechanism has not been fully clarified yet. Here, we study elastodynamic wave interaction in a one-dimensional seabed-sea water system and try to better comprehend the essential mechanism underlying seaquake generation. Our analytical results show if both seabed and sea water behave linear elastically and are subjected to incidence of a harmonic longitudinal wave, the wave interaction may induce resonance. Such systematic resonance might not be found if we assume, like in ordinary hydrodynamic analyses, rigid seabed covered by a layer of elastic water. The rigid seabed assumption might be unable to offer a precise dynamic description of the seabed-sea water system and the seaquake generation. Application of the concepts developed in rock dynamics may be useful in further study of seaquakes.
