Seismic refraction, multichannel analysis of surface waves (MASW) and ambient noise array measurements using the wireless array analysis (WARAN) system were applied to acquire near-surface profiles of seismic velocities in the Selinunte Archaeological Park. This ancient city is famous for numerous temples, which according to the literature, were destroyed by at least two earthquakes in antiquity. The morphology of the archeological park is affected by two rivers which in combination with the temple remains suggests three study sites. We determined the subsurface velocity at these three locations as essential information for further studies of the response of the temple structures to earthquake ground motions. The stratigraphy of the site indicates that low-velocity layers might exist. Seismic refraction profiles with 69 m spread and 24 geophones were employed during the active seismic experiments. The measured P-wave velocities of the top two layers were used as a constraint during the inversion of dispersion relations from the MASW and WARAN data. The reliability of the velocity profiles was tested by forward calculation of synthetic seismograms. P-wave velocities which were not well constraint throughout the dispersion curve inversions were adjusted through suitable Poisson’s ratios based on the well constraint S-velocities. The combined use of the three different kinds of measurements and multi-mode interpretation of the dispersion curves revealed velocity profiles including low-velocity layers which are supported by de-amplification observed in ratios of horizontal and vertical components of noise spectra.

中文翻译：

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结合使用折射地震，MASW和环境噪声阵列测量来确定西西里岛西里南德考古公园的近地表速度结构

应用了地震折射，表面波多通道分析（MASW）和使用无线阵列分析（WARAN）系统进行的环境噪声阵列测量，以获取Selinunte考古公园地震波的近地表剖面。这座古老的城市以众多的寺庙而闻名，根据文献记载，这些寺庙在古代至少两次地震中被摧毁。考古公园的形态受到两条河流的影响，这些河流与圣殿遗迹相结合，提出了三个研究地点。我们确定了这三个位置的地下速度，作为进一步研究庙宇结构对地震地面运动响应的基本信息。该地层的地层表明可能存在低速层。在积极的地震实验中，采用了具有69 m扩展和24个地震检波器的地震折射剖面。从MASW和WARAN数据反演色散关系时，在最上面两层测得的P波速度被用作约束。通过合成地震图的正演计算测试了速度剖面的可靠性。在整个色散曲线反演中没有很好约束的P波速度是通过基于井约束S速度的合适的泊松比进行调整的。三种不同类型的测量值的结合使用和色散曲线的多模式解释，揭示了包括低速层的速度剖面，这些低速层由以噪声谱的水平分量和垂直分量之比观察到的去放大作用所支持。