Propagation Characteristics of Seismic Waves in Shallow Sea Sedimentary Layers

Abstract

Zhao, S.; Gu, D.; Guo, C.; Wang, X., and Zhang, J., 2023. Propagation characteristics of seismic waves in shallow sea sedimentary layers. Journal of Coastal Research, 39(1), 32–44. Charlotte (North Carolina), ISSN 0749-0208. To explore new techniques for detecting and identifying targets in water, the propagation characteristics of seismic waves in shallow sea were deeply studied. Wave theory and staggered grid finite difference method were employed to analyze the propagation characteristics of seismic waves in a layer of underwater medium with a sedimentary layer. The results show that a Scholte wave is prone to disperse in an underwater medium with a sedimentary layer. The sediment thickness and acoustic parameters have great influence on the propagation characteristics of seismic waves. Moreover, the seismic wave signals were mainly concentrated below 20 Hz by collecting the vibration velocity of underwater interface. Furthermore, Scholte wave signals in underwater experiments were determined by utilizing four filtering methods and Scholte polarization characteristics, and the Butterworth filtering method can better preserve the integrity of vibration velocity signal. The theoretical, numerical, and experimental polarization characteristic results are basically consistent, which indicate that Scholte wave can be well extracted by the method of polarization characteristics.