Reevaluating soil amplification using multi-spectral HVSR technique in La Chana Neighborhood, Granada, Spain

IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Journal of Seismology Pub Date : 2024-06-26 DOI:10.1007/s10950-024-10227-2
Carlos Jose Araque-Perez
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Abstract

This work presents a thorough reevaluation of soil amplification in the La Chana neighborhood of Granada through a pioneering application of the horizontal-to-vertical spectral ratio technique on seismic noise data using various spectral approaches. The research recycles old seismic noise data recorded at 34 stations with 2 Hz instruments in the year 2010, supplemented with additional measurements recorded with broadband seismometers at nearby locations in the years 2013 and 2017. Initial traditional processing identifies a narrowband dominant frequency around 1.5 Hz, attributed to artificial or anthropogenic sources. To address this, the Maximum Entropy Algorithm was implemented to smooth the spectral response below 1 Hz, and filter out frequency peaks with very narrow spectral bands, while preserving the narrowband frequency around 1.5 Hz in some records. The Thomson Multitaper method further refined the spectral ratio, emphasizing the detection and suppression of narrow frequency bands that may be related to industrial activity. The results demonstrated the reappearance of the 1.5 Hz frequency, but this time without narrow bandwidths, indicating its possible correlation with the natural ground movement. Fundamental periods, ranging from 0.45 s to 0.88 s, suggest a diverse lithological composition, indicating the presence of layers of sands, clays, conglomerates, and carbonates over a basement that represents the main impedance contrast in the area. The multispectral approach surpasses conventional methods in precision and reliability, providing valuable insights for earthquake risk assessment, urban planning, and engineering decisions in seismically active regions.

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利用多光谱 HVSR 技术重新评估西班牙格拉纳达 La Chana 社区的土壤放大情况
本研究开创性地在地震噪声数据上应用了水平-垂直频谱比技术,并采用了多种频谱方法,对格拉纳达 La Chana 社区的土壤放大现象进行了全面的重新评估。这项研究回收了 2010 年在 34 个台站用 2 赫兹仪器记录的旧地震噪声数据,并补充了 2013 年和 2017 年在附近地点用宽带地震仪记录的额外测量数据。最初的传统处理方法确定了 1.5 赫兹左右的窄带主频,这归因于人工或人为源。为解决这一问题,采用了最大熵算法来平滑 1 Hz 以下的频谱响应,并滤除频谱带非常窄的频率峰,同时保留了一些记录中 1.5 Hz 附近的窄带频率。Thomson Multitaper 方法进一步完善了频谱比率,重点检测和抑制了可能与工业活动有关的窄频带。结果表明,1.5 赫兹频率再次出现,但这次没有窄频带,表明其可能与自然地面运动有关。基期从 0.45 秒到 0.88 秒不等,表明岩性成分多种多样,表明在代表该地区主要阻抗对比的基底上存在砂层、粘土层、砾岩层和碳酸盐层。多光谱方法在精确度和可靠性方面超越了传统方法,为地震活跃地区的地震风险评估、城市规划和工程决策提供了宝贵的见解。
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来源期刊
Journal of Seismology
Journal of Seismology 地学-地球化学与地球物理
CiteScore
3.30
自引率
6.20%
发文量
67
审稿时长
3 months
期刊介绍: Journal of Seismology is an international journal specialising in all observational and theoretical aspects related to earthquake occurrence. Research topics may cover: seismotectonics, seismicity, historical seismicity, seismic source physics, strong ground motion studies, seismic hazard or risk, engineering seismology, physics of fault systems, triggered and induced seismicity, mining seismology, volcano seismology, earthquake prediction, structural investigations ranging from local to regional and global studies with a particular focus on passive experiments.
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