Local site‐effects for the city of Thessaloniki (N. Greece) using a 3‐D finite‐difference method: a case of complex dependence on source and model parameters
Local site‐effects for the city of Thessaloniki (N. Greece) using a 3‐D finite‐difference method: a case of complex dependence on source and model parameters
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DOI：
10.1111/j.1365-246x.2010.04606.x
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发表时间：
2010-04
影响因子：
2.8
通讯作者：
A. Skarlatoudis;C. Papazachos;N. Theodoulidis;J. Kristek;P. Moczo
中科院分区：
文献类型：
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作者：
A. Skarlatoudis;C. Papazachos;N. Theodoulidis;J. Kristek;P. Moczo
摘要使用三维有限差分建模方法研究了塞萨洛尼基市（希腊北方）大都市区地震运动的场地效应。假设三种不同的地震场景，每种场景有两种不同的震源机制。标准光谱比（SSR）计算从3-D合成和比较的比率从记录的运动，以及从1-D和2-D建模获得的比率由其他研究人员。6种情景下的平均SSR曲线与经验曲线吻合较好，而三维模拟的SSR结果与一维模拟的结果不同，表现出更高的基频和更大的放大幅度，与观测到的SSR比率吻合得更好。为更广泛的区域塞萨洛尼基的各种情况下获得的傅立叶振幅谱的比较显示相当大的依赖性的网站上的源属性（位置，深度和断层面的解决方案），以及对当地的结构的影响。
SUMMARY The site effects of seismic motion in the metropolitan area of the city of Thessaloniki (Northern Greece) are investigated using a 3-D finite-difference modelling approach. Three different seismic scenarios are assumed with two different focal mechanisms for each one. Standard spectral ratios (SSR) are calculated from 3-D synthetics and compared with the ratios from the recorded motion, as well as ratios obtained from 1-D and 2-D modelling by other researchers. The average SSR curves from the six scenarios are in good agreement with the empirical ones, whereas the SSR results from 3-D modelling are different from those from 1-D modelling, exhibiting higher fundamental frequencies and larger amplification amplitudes, in much better agreement with observed SSR ratios. Comparisons of Fourier amplitude spectra obtained for various scenarios for the broader area of Thessaloniki show considerable dependence of the site effects on the source properties (position, depth and fault-plane solution), as well as on the local structure.