Multichannel Analysis of Surface Waves based on Common Virtual Source Gathers of Seismic Ambient Noise Cross-Correlations: A Case Study at an Earth Dam in Brazil

IF 2.2 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Journal of Applied Geophysics Pub Date : 2024-10-05 DOI:10.1016/j.jappgeo.2024.105529

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Abstract

The S-wave velocity (Vs) is a valuable parameter for assessing the mechanical properties of subsurface materials for geotechnical purposes. Seismic surface wave methods have become prominent for estimating near-surface Vs models. Researchers have proposed methods based on passive seismic signals as efficient alternatives to enhance depth of investigation, lateral resolution and reduce field effort. This study presents the Multichannel Analysis of Surface Waves (MASW) utilizing Common Virtual Source Gathers (CVSGs) derived from seismic ambient noise cross-correlations, based on Ambient Noise Seismic Interferometry concepts. The method is applied to passive data acquired with an array of receivers at the Paranoá earth dam in Brasília, Brazil, to construct a pseudo-2D Vs image of the massif for interpretation. Our findings showcase the adopted processing flow and combination of methods as an effective approach for near-surface Vs estimation, demonstrating its usability also for large earth dam embankments.

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基于地震环境噪声交叉相关的共同虚拟源采集的面波多通道分析：巴西土坝案例研究

S 波速度（Vs）是评估岩土工程地下材料力学特性的重要参数。地震面波方法已成为估算近地表 Vs 模型的重要方法。研究人员提出了基于被动地震信号的方法，作为提高勘探深度、横向分辨率和减少现场工作量的有效替代方法。本研究以环境噪声地震干涉测量概念为基础，介绍了利用地震环境噪声交叉相关性衍生的通用虚拟震源采集（CVSG）进行地表波多通道分析（MASW）的方法。该方法应用于巴西巴西利亚帕拉诺亚土坝接收器阵列获取的被动数据，以构建用于解释的地块伪二维 Vs 图像。我们的研究结果表明，所采用的处理流程和方法组合是估算近地表 Vs 的有效方法，证明其也适用于大型土坝堤坝。

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来源期刊

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.