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DOI	10.1029/2020JB021336
	Refining Higher Modes of Rayleigh Waves Using Seismoelectric Signals Excited by a Weight-Drop Source: Study From Numerical Simulation Aspect
	Yuan S.; Ren H.; Huang Q.; Zheng X.-Z.; Yang Z.; He Z.; Zhang W.; Chen X.
发表日期	2021
ISSN	21699313
卷号	126 期号:5
英文摘要	Effective extraction of higher mode dispersion information has been a research hotspot in the study of surface waves. In this study, we introduce a novel approach of refining Rayleigh wave higher modes by using seismoelectric signals, namely, electromagnetic (EM) signals originating from seismoelectric conversion. Adopting a weight-drop source, we simulate seismic and EM signals for several porous models. An extended version of the frequency-Bessel transform method is introduced to extract dispersion information from seismic and EM signals. Results suggest that the evanescent seismoelectric waves, which are induced at subsurface interfaces penetrated by Rayleigh waves and finally are recorded nearby the ground surface after undergoing amplitude decay, can reflect dispersion characteristics of Rayleigh waves and can provide extra higher-mode dispersion information that seismic waves cannot. We find the vadose zone with higher water saturation will cause the seismoelectric signals to have stronger strengths and change their frequency coverage of dispersion information. Electric fields obtained from potential differences between longer dipole electrodes suffer more severe distortion. In an electrically resistive environment, predicted seismoelectric signal amplitudes in the frequency band with dominant energy are well above expected background noise levels. We also find seismoelectric signals have a stronger antialiasing ability than seismic waves and their dispersion energy values are sensitive to salinity and fluid viscosity. Generally speaking, our study suggests Rayleigh wave dispersion information with abundant higher modes and good frequency-range coverage can be obtained by using seismic and seismoelectric signals together due to their complementarity. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	dispersion information; frequency-Bessel transform method; higher modes; Rayleigh waves; seismoelectric signals
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187117
作者单位	Department of Astronautical Science and Mechanics, Harbin Institute of Technology, Harbin, China; Department of Earth and Space Sciences, Southern University of Science and Technology, Shenzhen, China; Department of Geophysics, School of Earth and Space Sciences, Peking University, Beijing, China
推荐引用方式 GB/T 7714	Yuan S.,Ren H.,Huang Q.,et al. Refining Higher Modes of Rayleigh Waves Using Seismoelectric Signals Excited by a Weight-Drop Source: Study From Numerical Simulation Aspect[J],2021,126(5).
APA	Yuan S..,Ren H..,Huang Q..,Zheng X.-Z..,Yang Z..,...&Chen X..(2021).Refining Higher Modes of Rayleigh Waves Using Seismoelectric Signals Excited by a Weight-Drop Source: Study From Numerical Simulation Aspect.Journal of Geophysical Research: Solid Earth,126(5).
MLA	Yuan S.,et al."Refining Higher Modes of Rayleigh Waves Using Seismoelectric Signals Excited by a Weight-Drop Source: Study From Numerical Simulation Aspect".Journal of Geophysical Research: Solid Earth 126.5(2021).