Modeling of two-dimensional water motion field during a seaquake

This study investigates seaquake phenomena, analyzing the role of P-waves in generating seismic waves in water. Different modeling approaches for understanding the dynamic water motion during seaquake are addressed and one-dimensional P-wave propagation in the frequency domain is compared to two dimensional propagation models in frequency and time domain. The comparison is specifically carried out for structures like Submerged Floating Tunnels focusing on the effect of water depth, self-damping and resonance on the water motion field. The two dimensional propagation model in frequency domain is extended to account for a non-flat seabed. The results obtained are critically compared to the ones delivered by a time domain approach utilizing a Finite Element discretization and exploiting the Domain Reduction Method for soil-structure interaction analysis.