Shear wave velocity inversion of marine sediments using deep-water OBS Scholte-wave data

IF 0.7 4区地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS Applied Geophysics Pub Date : 2024-03-21 DOI:10.1007/s11770-024-1073-z

Peng-Fei Yu, Jia-Meng Jiang, Jian-Hua Geng, Bao-Jin Zhang

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Abstract

Acoustic velocity varies in deep-water environments, and the variable-velocity seawater can affect the dispersion characteristics of Scholte wave. To improve the accuracy of inversion, a horizontal layered-seawater and layered-seabed (HLSLS) model is established with continuously varying velocities for seabed S-wave velocity inversion using Scholte wave. First, we deduced the Scholte wave dispersion equation and the amplitude-depth equation of the HLSLS model based on wave theory. Then, with the real acoustic velocity of the seawater and submarine sediments parameters of the Shenhu area in the South China Sea, we analyzed the influence of variable-velocity seawater on the dispersion characteristics of Scholte wave. Finally, we performed two-dimensional (2D) S-wave velocity inversion on the field OBS multi-component data in the South China Sea. The results showed that the variation of seawater acoustic velocity had a certain influence on the dispersion characteristics of Scholte wave in deep water. The accuracy and practicality of our method were verified through numerical and filed data experiments.

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利用深水 OBS 肖尔特波数据反演海洋沉积物的剪切波速度

深水环境中的声速是变化的，变速海水会影响肖尔特波的频散特性。为了提高反演的精度，建立了水平分层海水和分层海底（HLSLS）模型，利用连续变化的速度对海底 S 波进行肖尔特波速度反演。首先，我们根据波浪理论推导出 Scholte 波频散方程和 HLSLS 模型的幅深方程。然后，结合南海神狐海域海水实际声速和海底沉积物参数，分析了变速海水对 Scholte 波频散特性的影响。最后，我们对南海现场 OBS 多分量数据进行了二维 S 波速度反演。结果表明，海水声速的变化对深水肖尔特波的频散特性有一定的影响。通过数值和锉刀数据实验验证了我们方法的准确性和实用性。

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来源期刊

Applied Geophysics 地学-地球化学与地球物理

CiteScore

1.50

自引率

14.30%

发文量

912

审稿时长

2 months

期刊介绍： The journal is designed to provide an academic realm for a broad blend of academic and industry papers to promote rapid communication and exchange of ideas between Chinese and world-wide geophysicists. The publication covers the applications of geoscience, geophysics, and related disciplines in the fields of energy, resources, environment, disaster, engineering, information, military, and surveying.