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Dispersion characteristics of seabed Scholte waves with variable velocity seawater in deep water

  • Signal processing
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Abstract

Acoustic velocity varies in deep-water environments. To obtain accurate inversion interpretations, it is necessary to develop a horizontally layered seawater—seabed (HLSS) model with continuously varying velocities. In this work, we used an HLSS model based on wave theory to deduce the Scholte wave dispersion equations and established an HLSS model based on the acoustic velocity profile and the submarine medium parameters of the South China Sea. We studied the dispersion characteristics of Scholte waves and theoretically calculated the amplitude—depth distribution. We also examined the influence of deep-water environments on the dispersion characteristics of Scholte waves. Using the real geological parameters of the Dongsha Islands in the South China Sea, we exploited the spectral element method to simulate seismic wave propagation in the fluid—solid interface and extracted the Scholte wave dispersion curves using multichannel analysis of surface waves (MASW). The consistent theoretical and extracted dispersion curve results verified the accuracy of our method. Numerical experiments showed that the dispersion characteristics of Scholte waves in deep water are weaker than those in shallow water. In addition to the seawater depth and the physical parameters of seabed sediments, the seawater’s variable velocity also influences Scholte wave dispersion characteristics.

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Acknowledgments

This research is funded by the National Natural Science Foundation of China (grant no. 42074149) and the Natural Science Foundation of Jiangsu Province (BK20201318). We are grateful to the editor and reviewers for their valuable comments and intensive editing that helped improve the manuscript.

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Authors and Affiliations

  1. College of Oceanography, Hohai University, Nanjing, 210024, China

    Jia-Meng Jiang & Peng-Fei Yu

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  1. Jia-Meng Jiang
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  2. Peng-Fei Yu
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Correspondence to Peng-Fei Yu.

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Jiang Jia-Meng received a bachelor’s degree (graduation) in resource prospecting engineering from the College of Yangtze River of East China University of Technology (2021). She is currently pursuing her master’s degree in geophysics from the College of Oceanography of Hohai University (2021–2024). Her interests are mainly in the analysis of dispersion characteristics of seismic surface waves and the inversion of shear wave velocity. E-mail: jiangjiameng@hhu.edu.cn

Corresponding author: Yu Peng-Fei received a bachelor’s degree (graduation) in geophysics (2009), a master’s degree in earth exploration and information technology (2012) from the School of Resources of China University of Mining and Technology, and a doctor’s degree in solid geophysics from the School of Ocean of Tongji University (2016). He is now a young associate professor and graduate supervisor at the College of Oceanography of Hohai University. His research interests include seismic wave propagation at the fluid-solid interface, subsea multi-component data imaging and inversion, and their applications in oil and gas exploration.

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Jiang, JM., Yu, PF. Dispersion characteristics of seabed Scholte waves with variable velocity seawater in deep water. Appl. Geophys. 19, 537–552 (2022). https://doi.org/10.1007/s11770-022-0948-0

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  • DOI: https://doi.org/10.1007/s11770-022-0948-0

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