Evaluation of earthquake ground motion and site effects in the Thessaloniki urban area by 3D finite-fault numerical simulations
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- 作者：Chiara Smerzini ; Kyriazis Pitilakis ; Kiana Hashemi
- 关键词：3D numerical modeling ; Seismic wave propagation ; Earthquake ground motion ; Site effects
- 刊名：Bulletin of Earthquake Engineering
- 出版年：2017
- 出版时间：March 2017
- 年：2017
- 卷：15
- 期：3
- 页码：787-812
- 全文大小：
- 刊物类别：Earth and Environmental Science
- 刊物主题：Geotechnical Engineering & Applied Earth Sciences; Environmental Engineering/Biotechnology; Civil Engineering; Geophysics/Geodesy; Hydrogeology; Structural Geology;
- 出版者：Springer Netherlands
- ISSN：1573-1456
- 卷排序：15
文摘
In this study earthquake ground motion in the Thessaloniki urban area is evaluated using a 3D spectral element numerical approach. The availability of detailed geotechnical/geophysical data from past microzonation studies together with the seismological information regarding the relevant fault sources allowed for the creation of a large-scale 3D numerical model. The latter is suitable for generating finite-fault physics-based ground shaking scenarios within the city of Thessaloniki up to maximum frequencies of about 1.5 Hz. As a representative case study, the simulation of the historical MW 6.5 June 20th 1978 Volvi earthquake is addressed. The results show that reasonable estimates can be obtained in terms both of ground motion time histories at the only available strong motion station and of spatial distribution of peak ground motion parameters, as compared to the regional map of macroseismic intensity and to the predictions of attenuation laws. The numerical model is, then, used to provide insights into 3D site effects occurring in the city of Thessaloniki, by showing the comparison between synthetic and experimental Standard Spectral Ratios (SSR) as well as the effect of non-linear visco-elastic soil behavior and the spatial variability of amplification factors with respect to outcrop bedrock basement. The results of this study demonstrate the potentialities of 3D physics-based numerical modeling for deterministic-based seismic hazard assessment studies in large urban areas characterized by complex geological configurations, such as the Thessaloniki area.