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首页> 外文期刊>Bulletin of earthquake engineering >Extensive characterization of Italian accelerometric stations from single-station ambient-vibration measurements
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Extensive characterization of Italian accelerometric stations from single-station ambient-vibration measurements

机译：从单站环境振动测量中广泛表征意大利加速度计站

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摘要

This paper describes the analyses of the single-station ambient-vibration measurements performed on the Italian accelerometric network to detect site resonance phenomena potentially affecting earthquake recordings. The use of lowcost, high quality microtremor measurement can be helpful to discriminate among soil classes, since several classification schemes based on resonance frequencies were proposed in the last decades. Operatively, in the framework of the Italian Strong Motion Database project (DPC-INGV 2007–2009 S4; http://esse4.mi.ingv.it), soil resonance frequencies have been evaluated from more than 200 ambient vibration measurements in correspondence of accelerometric stations included in ITACA (http://itaca.mi.ingv.it/ItacaNet/). The noise recordings have been analyzed using the same numerical protocol in order to standardize the results. Particular attention has been paid to evaluate the quality of measurements and to develop an on-purpose mathematical tool to automatically estimate the peaks in the horizontal-to-vertical spectral ratio (HVSR) curve. The reliability of the resonance frequencies from HVSR has been tested by comparing estimates provided by independent methods (modeling or earthquake recordings). The test confirmed the reliability of the microtremor HVSR for assessing the resonance frequencies of the examined sites.
机译：本文介绍了在意大利加速度计网络上执行的单站环境振动测量的分析，以检测可能影响地震记录的现场共振现象。由于过去几十年提出了几种基于共振频率的分类方案，因此使用低成本，高质量的微震测量有助于区分土壤类别。在操作上，在意大利强运动数据库项目（DPC-INGV 2007–2009 S4; http://esse4.mi.ingv.it）的框架内，根据200多个环境振动测量值评估了土壤共振频率， ITACA（http://itaca.mi.ingv.it/ItacaNet/）中的加速度计测站。为了使结果标准化，已经使用相同的数字协议对噪声记录进行了分析。已经特别注意评估测量的质量并开发了一种专用的数学工具来自动估计水平与垂直光谱之比（HVSR）曲线中的峰值。通过比较独立方法（建模或地震记录）提供的估计值，测试了HVSR共振频率的可靠性。该测试证实了微震HVSR评估评估部位共振频率的可靠性。

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