The potential application of conducting Scholte-wave analysis using electroseismic pressure fields excited by an electric current source due to the electrokinetic effect in fluid-saturated porous seabed sediments is investigated. First, we develop a numerical modelling algorithm by combining the Luco–Apsel–Chen generalized reflection and transmission method with the peak-trough averaging method to simulate the electroseismic wave fields in stratified fluid/porous media. The modelling results show that the electroseismic pressure signals recorded on the seafloor are mainly composed of evanescent electroseismic waves, and Scholte waves are the dominant wave pattern. Their amplitudes are generally within the order of magnitudes capable of being detected by current seismic instruments. Then, the modified frequency–Bessel transform method is extended to extract the Scholte-wave dispersion curves from electroseismic pressure fields. Results demonstrate that Scholte-wave dispersion curves extracted from electroseismic records are superior to those extracted from conventional seismic wave fields excited by an airgun source under the same source–receiver geometry because they contain many overtones and are almost free from the interferences of dispersive guided waves. Furthermore, the Scholte-wave dispersion inversion results obtained by employing the Levenberg–Marquardt method show that the shear-wave velocity model inverted by Scholte-wave dispersion curves extracted from the electroseismic pressure field is more accurate than those obtained by dispersion curves extracted from the seismic wave fields with the guided-wave removal. The above results indicate that the electroseismic Scholte-wave analysis method has the potential to evaluate the shear-wave velocities of shallow-water seabed sediments.

中文翻译：

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电震 Scholte 波分析：一种估计浅水海底沉积物剪切波速度结构的潜在方法

研究了利用由于流体饱和多孔海底沉积物中的动电效应而由电流源激发的电震压力场进行 Scholte 波分析的潜在应用。首先，我们开发了一种数值建模算法，将 Luco-Apsel-Chen 广义反射和透射方法与峰谷平均方法相结合来模拟分层流体/多孔介质中的电震波场。模拟结果表明，海底记录的电震压力信号主要由倏逝电震波组成，且以Scholte波为主。它们的振幅通常在当前地震仪器能够检测到的数量级内。然后，将改进的频率-贝塞尔变换方法扩展到从电震压力场中提取Scholte波频散曲线。结果表明，在相同的震源-接收器几何条件下，从电震记录中提取的Scholte波色散曲线优于从气枪震源激发的传统地震波场中提取的Scholte波色散曲线，因为它们包含许多泛音并且几乎不受色散导波的干扰。此外，采用Levenberg-Marquardt方法得到的Scholte波频散反演结果表明，从电震压力场中提取的Scholte波频散曲线反演的剪切波速度模型比从地震压力场中提取的频散曲线反演的剪切波速度模型更准确。去除导波的地震波场。上述结果表明电震Scholte波分析方法具有评估浅水海底沉积物剪切波速度的潜力。