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首页> 外文期刊>Pure and Applied Geophysics >Contributions of basin-edge-induced surface waves to site effect in the Dinar basin, southwestern Turkey
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Contributions of basin-edge-induced surface waves to site effect in the Dinar basin, southwestern Turkey

机译：土耳其西南部第纳尔盆地盆地边缘诱发的面波对场地效应的贡献

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摘要

Ground motion amplifications in the Dinar basin, and contributions of the surface waves generated from basin edges are investigated in frequency and time domains. Amplification functions are computed from the aftershock data of the October 1, 1995 Dinar earthquake (M-W=6.4) using the Standard Spectral Ratio method which requires a pair of instruments; one located at the site under investigation (generally on alluvium) and the other on a reference site, preferably a nearby rock site. First, a time window covering the whole signal is used to compute the amplification function, and, successively, the noise, P wave, S wave and the surface wave time windows are used in computation to observe their contributions to the amplification function. It is seen that the maximum amplifications observed at about 2.0 Hz on the amplification functions of the stations located in the basin are largely due to basin edge induced surface waves. These waves have significantly increased the duration of signals recorded within the basin. Particularly, on the vertical component records, the amplitudes of surface waves are larger than the S-wave amplitudes. The periods of waves amplified maximally due to the basin structure coincide with the natural periods of 4-6-story buildings which were heavily damaged in Dinar. This indicates that the site effects may have been important regarding the damage which occurred during the Dinar earthquake of October 1995.
机译：在频域和时域研究了第纳尔盆地的地震动放大，以及盆地边缘产生的表面波的贡献。使用1995年10月1日第纳尔地震（M-W = 6.4）的余震数据，使用标准光谱比方法（需要一对仪器）来计算放大函数;一个位于被调查地点（通常在冲积层上），另一个位于参考地点，最好是附近的岩石地点。首先，使用覆盖整个信号的时间窗口来计算放大函数，然后依次使用噪声，P波，S波和表面波时间窗口进行计算，以观察它们对放大函数的贡献。可以看出，位于盆地盆地台站的放大函数在大约2.0 Hz处观察到的最大放大率很大程度上是由盆地边缘引起的表面波引起的。这些波显着增加了盆地内记录的信号持续时间。特别是在垂直分量记录中，表面波的振幅大于S波的振幅。由于盆地结构，波浪的最大周期与第4层建筑物的自然周期一致，这些建筑物在第纳尔受到严重破坏。这表明对于1995年10月第纳尔地震期间发生的破坏，场地影响可能很重要。

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