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首页> 外文期刊>Journal of King Saud University >Microtremor measurements in Yanbu city of Western Saudi Arabia: A tool for seismic microzonation
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Microtremor measurements in Yanbu city of Western Saudi Arabia: A tool for seismic microzonation

机译：沙特阿拉伯西部盐布市的微震测量：地震微区划工具

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Microtremor measurements are one of the most popular world-wide tool for estimation of site response especially within the urban area. This technique has been applied over 85 sites distributed regularly through Yanbu metropolitan area with an ultimate aim of seismic hazard microzonation for ground-shaking site effects. The horizontal to vertical spectral analysis (H/V) was carried out over all the sites to estimate both the fundamental resonance frequency and its corresponding amplification for the ground vibration. In most sites, H/V curve for amplitude spectra display a clear peak suggesting the presence of a soil-bedrock impedance contrast. Other sites, however, show more than one peak indicating the presence of more than one impedance contrast through sedimentary cover. The estimated values of fundamental frequency range from 0.25 Hz up to 7.9 Hz increases with decreasing depths of basement rock. It has lower values at the central zone extending from north to south compared to the eastern and western parts of Yanbu area. On the other hand, the estimated values of amplification factor ranges from the value of 2 to 5, where the higher values prevailing through the central zone with increasing thickness of sediments. Analyses of the acquired data set have clearly shown that, both of two parameters vary considerably through Yanbu city. This could be due to lateral variations in soil thickness and/or variations in the soil type at Yanbu area. These results show the 2D and 3D effect of basin geometry. The estimated values for the fundamental frequency from microtremor data are compared with that from shear-wave velocity structure within the area of interest and show an excellent agreement.
机译：微震测量是用于评估站点响应（尤其是在市区内）的全球最受欢迎的工具之一。这项技术已被应用到沿盐布市区定期分布的85个地点，其最终目的是通过地震危险微区化来达到震动场地的效果。在所有站点上进行了水平到垂直频谱分析（H / V），以估计基本共振频率及其对地面振动的相应放大率。在大多数站点中，振幅谱的H / V曲线显示一个清晰的峰，表明存在土壤-基岩阻抗对比。但是，其他位置显示出一个以上的峰，表明通过沉积覆盖物存在一个以上的阻抗对比。从0.25 Hz到7.9 Hz的基本频率范围的估计值随基底岩石深度的减小而增加。与盐步地区的东部和西部相比，它在从北向南延伸的中部地区具有较低的价值。另一方面，放大因子的估计值在2到5的范围内，其中较高的值随着沉积物厚度的增加而贯穿中心区域。对获得的数据集的分析清楚地表明，整个盐步市这两个参数都相差很大。这可能是由于盐步地区土壤厚度的横向变化和/或土壤类型的变化。这些结果显示了盆地几何形状的2D和3D效应。将来自微震数据的基频估计值与感兴趣区域内剪切波速度结构的基频估计值进行比较，并显示出极好的一致性。

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