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首页> 外文期刊>Bulletin of earthquake engineering >Seismic site characterization of the Kastelli (Kissamos) Basin in northwest Crete (Greece): assessments using ambient noise recordings
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Seismic site characterization of the Kastelli (Kissamos) Basin in northwest Crete (Greece): assessments using ambient noise recordings

机译：克里特岛（希腊）西北部卡斯泰利（Kissamos）盆地的地震场特征：使用环境噪声记录进行评估

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摘要

Crete is actively seismic and site response studies are needed for estimating local site conditions subjected to seismic activity. In order to collect basic data, we performed ambient noise recordings to estimate the site response of the surface and near subsurface structure of the small-scale Kastelli Basin in northwest Crete. The spatial horizontal to vertical spectral ratios (HVSR) resonance pattern of the investigated sites in the centre of the Basin consists of either one or two peaks divided into low to high frequency range in different sites as follows: (a) in some sites only one amplified peak at low frequencies (0.6-1.2 Hz), (b) in other sites only one amplified peak at medium frequencies (2.9-8.5 Hz) and (c) in yet other sites two amplified peaks in the low to high frequency range (0.6-15.5 Hz). The investigated sites are amplified in the frequency range 0.6-15.5 Hz, while the amplitude reaches to a factor of 4 in the spectral ratios. The one HVSR amplified peak at low frequencies is related to locally soft or thick Quaternary deposits. Microtremors were measured in the coastal northwest part of the Basin in a well-lithified Cretaceous limestone site characterized by fractures and faults striking predominantly in a sector NNE to NNW. Sites of one amplified peak at medium frequencies are extended from coastal northwest to southwest delineating a structure striking to NNW. The two amplified peaks are attributed to shallow subsurface heterogeneities/irregularities, locally induced by fault zones and to the overlying Quaternary deposits. Spatial HVSR variations in the frequency and HVSR shape delineate four structures striking NNE, NNW and in a sector NW to WNW, crosscutting the dense populated Basin suggesting that microtremors could be a valuable tool for providing a first approximation of fault zone delineation at least for the Kastelli-Kissamos Basin. The Basin is classified into the X soil category of the Greek Seismic Code 2000.
机译：克里特岛是积极的地震活动，需要现场响应研究来估计遭受地震活动的本地现场条件。为了收集基本数据，我们进行了环境噪声记录，以估算克里特岛西北部小规模Kastelli盆地地表和近地下结构的现场响应。流域中部被调查地点的空间水平与垂直光谱之比（HVSR）共振模式由一个或两个峰值组成，在不同地点划分为低频至高频范围，如下所示：（a）在某些地点只有一个在低频（0.6-1.2 Hz）处的放大峰，（b）在其他站点中只有一个在中频（2.9-8.5 Hz）处的放大峰，（c）在其他站点中在低频至高频范围内的两个放大峰（ 0.6-15.5 Hz）。被调查的位置在0.6-15.5 Hz的频率范围内被放大，而振幅在频谱比率中达到4倍。低频处一个HVSR放大峰与局部较软或较厚的第四纪沉积有关。在盆地西北部沿海地区一个微晶化的白垩纪石灰岩地区测量了微震，其特征是断裂和断层主要发生在NNE至NNW扇形。在中频处一个放大峰的位点从西北沿海扩展到西南，描绘了一个撞击NNW的结构。这两个放大的峰归因于浅层地下异质性/不规则性，由断层带和上覆的第四纪沉积物引起。频率和HVSR形状的空间HVSR变化描绘了撞击NNE，NNW和NW到WNW扇形的四个结构，横切了人口稠密的盆地，这表明微震至少可以为至少一次断层圈定提供第一近似的有价值的工具。卡斯泰利-基萨莫斯盆地。该盆地被归类为2000年希腊地震法典的X土类。

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