Dispersion characteristics of Scholte waves on horizontal layered seabed
YU Pengfei1, CHEN Junlin1, JIANG Jiameng1, YANG Xiaohui2
1. College of Oceanography, Hohai University, Nanjing, Jiangsu 210024, China; 2. Sinopec Geophysical Research Institute, Nanjing, Jiangsu 211103, China
Abstract：Scholte waves propagate along the seafloor fluid-solid interface and exhibit typical dispersion characteristics. The dispersion properties of Scholte waves can be utilized for the inversion of the shear wave velocity of the shallow seabed， making it an effective tool for seabed shear wave velocity modeling. It is of critical importance to establish the theoretical model of Scholte wave dispersion. In this study， a horizontal layered model of seawater-seabed elasticity is developed based on a real seawater-seabed environment. The dispersion equation and displacement equation for Scholte waves in this model are derived using the continuity conditions of boundary stress and displacement. The influence of seawater depth and seabed property parameters on the dispersion characteristics of Scholte waves is analyzed. Experimental results using a 6-layer seawater–seabed model show that： ①Regardless of the seabed is hard or soft， Scholte waves exhibit distinct dispersion characteristics. In the case of a hard seabed， the energy of Scholte waves is mainly concentrated in the seawater， with the fundamental mode having the weakest energy and the second mode having the strongest energy. As the seawater depth increases， the dispersion characteristics of Scholte waves weaken. For the soft seabed model， the energy of Scholte waves on the solid seabed significantly increases， and the seawater depth has little effect on Scholte wave dispersion characteristics. ②Compared with deep-water environments， Scholte waves have stronger energy and more pronounced dispersion characteristics in shallow water. Therefore， utilizing Scholte waves for inverting the shallow seabed shear wave velocity in shallow water environments yields higher accuracy and reliability. Finally， based on an actual seabed elastic geological model of a working area in the East China Sea， multi-component seismic data are simulated， and dispersion curves are extracted. A comparison analysis between the theoretically calculated dispersion curves and the extracted dispersion curves shows a good agreement， confirming the accuracy of our theoretical approach.
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