Study on the influencing factors of combined processing of active and passive surface-wave data on dispersion imaging

IF 2.2 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
Ling Ning , Tianyu Dai , Hao Zhang , Ya Liu , Liduan Zheng , Chaoqiang Xi
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Abstract

Active and passive surface-wave methods have garnered significant attention in the near-surface geophysical community for their non-destructive, non-invasive, low-cost, and accurate advantages in delineating subsurface shear (S)-wave velocity structures. They are increasingly being utilized to address numerous engineering and environmental problems. Surface waves obtained from actively excited sources such as a hammer and a harmonic shaker, however, lack low-frequency components, resulting in limited investigation depth. Conversely, passive surface waves such as microseisms (< 0.4 Hz, associated with natural ocean wave activity) and microtremor (>1 Hz, generated by cultural and wind sources) retrieved from ambient seismic noise typically lack high-frequency components, which is not conductive to characterizing fine near-surface structures. To overcome these frequency limitations, we employ a “mixed-source data” strategy, imposing active shot gathers into ambient noise data, to widen the frequency range of dispersion images and depth of investigative capabilities. We simulate both active and passive surface-wave data based on a two-layer model, noting that their dispersion images suffer from a mode kissing phenomenon at lower frequencies. By analyzing influencing factors such as the amplitude intensity, the signal-to-noise ratio and the excitation locations of active shot gathers, as well as the length of passive surface-wave data, we better understand their impacts on dispersion images from mixed-source surface-wave data. Simulation tests demonstrate that processing mixed-source data can effectively distinguish the mode kissing phenomenon. Moreover, the effectiveness of this strategy in enhancing the quality of dispersion image is verified, especially when surface-wave dispersion images perform poorly in either the low- or high-frequency bands. Additionally, a real-world example further demonstrates that processing mixed-source data offers significant advantages in improving the quality of dispersion images. This way provides a convenient and efficient measurement strategy for delineating shear-wave velocity profiles in finer shallow layers and deeper penetration depths.

研究主动和被动面波数据联合处理对频散成像的影响因素
有源和无源面波方法具有非破坏性、非侵入性、低成本和精确等优点,可用于确定地下剪切(S)波速度结构,因此在近地表地球物理学界备受关注。它们越来越多地被用于解决众多工程和环境问题。然而,从主动激发源(如锤子和谐波激振器)获得的面波缺乏低频成分,导致勘测深度有限。相反,从环境地震噪声中获取的被动面波,如微地震波(0.4 Hz,与自然海浪活动有关)和微震波(1 Hz,由文化和风源产生)通常缺乏高频成分,这不利于描述精细的近地表结构。为了克服这些频率限制,我们采用了 "混合源数据 "策略,将主动震源采集纳入环境噪声数据,以拓宽频散图像的频率范围和调查能力的深度。我们基于双层模型模拟了主动和被动面波数据,注意到它们的频散图像在较低频率下存在模吻现象。通过分析影响因素,如主动集束的振幅强度、信噪比和激发位置,以及被动面波数据的长度,我们更好地理解了它们对混合源面波数据频散图像的影响。模拟测试表明,处理混合源数据可以有效区分模吻现象。此外,这一策略在提高频散图像质量方面的有效性也得到了验证,尤其是当面波频散图像在低频或高频段表现不佳时。此外,一个实际例子进一步证明,处理混合源数据在提高频散图像质量方面具有显著优势。这种方法提供了一种便捷高效的测量策略,可用于绘制更精细浅层和更深穿透深度的剪切波速度剖面图。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Applied Geophysics
Journal of Applied Geophysics 地学-地球科学综合
CiteScore
3.60
自引率
10.00%
发文量
274
审稿时长
4 months
期刊介绍: The Journal of Applied Geophysics with its key objective of responding to pertinent and timely needs, places particular emphasis on methodological developments and innovative applications of geophysical techniques for addressing environmental, engineering, and hydrological problems. Related topical research in exploration geophysics and in soil and rock physics is also covered by the Journal of Applied Geophysics.
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