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Comparative Study of Microtremor Analysis Methods

机译:微震分析方法的比较研究

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摘要

— During a multidisciplinary microzonation pilot project in the city of Heraklion (Crete, Greece), microtremor data were collected at the top of exploratory boreholes specifically designed for the purposes of the project, over a period of 5 days, for 4 h/day at 125 Hz (continuous recordings). The data were analysed with the SSR and H/V Ratio techniques, using the standard FFT (applied to long data series) and a Multi-variate Maximum Entropy (MV-MAXENT) spectral analysis method. Both techniques, implemented with both spectral analysis methods, identify the same major resonance frequency band, albeit with different amplification levels. The MV-MAXENT however is effective in handling short data lengths while yielding high resolution spectra and addressing several shortcomings of the conventional FFT (windowing, zero padding etc.). Thus, it yields competitively similar results, with only a fraction (a few minutes) of the data required by the lower resolution (FFT) method and appears to be a powerful tool for site effect investigations. Moreover, the results of both microtremor-based techniques are consistent and remarkably similar to the results of microzonation methods that require (expensive) borehole data.
机译:—在伊拉克利翁市(希腊克里特岛)的多学科微带试验项目中,在专门为该项目目的而设计的勘探井顶部收集了微震数据,历时5天,每天4小时。 125 Hz(连续记录)。使用标准FFT(适用于长数据序列)和多元最大熵(MV-MAXENT)光谱分析方法,通过SSR和H / V比率技术对数据进行了分析。两种频谱分析方法均实现的两种技术,即使放大率不同,也可以识别相同的主共振频带。然而,MV-MAXENT在处理短数据长度时有效,同时产生高分辨率频谱并解决了传统FFT的几个缺点(窗口,零填充等)。因此,它产生了竞争性相似的结果,仅是较低分辨率(FFT)方法所需数据的一小部分(几分钟),并且似乎是进行现场效果研究的强大工具。此外,两种基于微震的技术的结果都是一致的,并且与需要(昂贵)井眼数据的微分区方法的结果非常相似。

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  • 来源
    《Pure and Applied Geophysics》 |2001年第12期|2463-2479|共17页
  • 作者单位

    Department of Geophysics and Geothermy University of Athens Panepistimioupolis 157 84 Athens Greece. E-mails: diagourtas@geol.uoa.gr;

    kmacrop@atlas.uoa.gr;

    Department of Geophysics and Geothermy University of Athens Panepistimioupolis 157 84 Athens Greece. E-mails: diagourtas@geol.uoa.gr;

    kmacrop@atlas.uoa.gr;

    Department of Geophysics and Geothermy University of Athens Panepistimioupolis 157 84 Athens Greece. E-mails: diagourtas@geol.uoa.gr;

    kmacrop@atlas.uoa.gr;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Key words: Site effect; microzonation; microtremor; ambient noise; maximum entropy spectral analysis.;

    机译:关键词:场地效应;微区微震环境噪声;最大熵谱分析。;

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