Azimuth correction for passive surface wave dispersion based on polarization analysis

IF 2.8 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Yu Hong, Jianghai Xia, Hao Zhang, Jingyin Pang, Bo Guan, Jie Zhou, Yulong Ma
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引用次数: 0

Abstract

Summary Passive surface-wave methods have found extensive application in near-surface investigation due to their benefits of low costs, noninvasiveness, and high accuracy. Linear arrays are usually adopted in urban environments for their convenience and efficiency. However, the distribution of noise sources in densely populated urban areas varies rapidly in time and space, making it challenging to estimate accurate dispersion spectra using a linear array. To solve this problem, we propose a polarization analysis-based azimuthal correction method. We first obtain the azimuth of each segment by calculating the correlation coefficient of three-component ambient noise data. The normalized correlation coefficient is then applied for quality control to select reliable segments. For selected segments, the overestimated velocity caused by directional sources are corrected to obtain accurate dispersion spectra. A synthetic test is conducted to demonstrate the feasibility of our method. Compared with the dispersion spectra obtained without any correction, the dispersion spectra obtained following the suggested scheme are more consistent with the theoretical dispersion curves. Two real-world examples at crossroads show the superiority of the proposed technique in obtaining higher-resolution dispersion energy and more accurate phase velocities. In addition, our approach can attenuate the artifacts and improve the dispersion measurements.
基于偏振分析的被动面波频散方位角校正
摘要 无源面波方法具有成本低、非侵入性和高精度等优点,在近地表勘测中得到了广泛应用。线性阵列因其方便性和高效性通常被城市环境所采用。然而,在人口稠密的城市地区,噪声源的分布在时间和空间上变化迅速,因此使用线性阵列估算精确的频散谱具有挑战性。为了解决这个问题,我们提出了一种基于偏振分析的方位角校正方法。首先,我们通过计算三分量环境噪声数据的相关系数来获得每个区段的方位角。然后应用归一化相关系数进行质量控制,选出可靠的片段。对于选定的区段,校正由定向源引起的高估速度,以获得准确的频散谱。为了证明我们方法的可行性,我们进行了一次合成测试。与未做任何修正的频散谱图相比,根据建议方案得到的频散谱图与理论频散曲线更加一致。两个十字路口的实际例子表明,所建议的技术在获得更高分辨率的频散能量和更精确的相位速度方面具有优越性。此外,我们的方法还能减弱假象,改善频散测量。
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来源期刊
Geophysical Journal International
Geophysical Journal International 地学-地球化学与地球物理
CiteScore
5.40
自引率
10.70%
发文量
436
审稿时长
3.3 months
期刊介绍: Geophysical Journal International publishes top quality research papers, express letters, invited review papers and book reviews on all aspects of theoretical, computational, applied and observational geophysics.
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