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Complex Site Effects in Thessaloniki (Greece): II. 2D SH Modelling and Engineering Insights

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Abstract

This paper presents results of numerical modelling of site response for Thessaloniki, obtained with two different 2D methods; a finite difference and a finite element method. Ground motion across a 2D model of the subsoil of the city has been simulated for vertically incident SH waves. The predominance of locally generated surface waves is very clear in the synthetic seismograms of a weak event and of stronger ones. These results are then compared with the observations in time domain and frequency domain. The role of the soil formations with high attenuation in the lateral propagation and the effect of the differential motion close to the lateral variations are also pinpointed. The stronger events were finally used to compute strong ground motion in order to reveal and to discuss practical engineering aspects such as peak ground acceleration value, the most familiar indicator in seismic norms, the soil to rock spectral coefficients for the period bandwidth of interest, and the aggravation factor in terms of 2D to 1D response spectra as a useful ruler to account for complex site effects.

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Authors and Affiliations

  1. Department of Civil Engineering, Aristotle University of Thessaloniki, P.O.B. 450, GR-54124, Thessaloniki, Greece

    Dimitrios Raptakis & Kyriazis Pitilakis

  2. Institute of Engineering Seismology and Earthquake Engineering, P.O.B. 53, GR-55102, Thessaloniki, Greece

    Konstantia Makra & Anastasios Anastasiadis

Authors
  1. Dimitrios Raptakis
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  2. Konstantia Makra
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  3. Anastasios Anastasiadis
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  4. Kyriazis Pitilakis
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Correspondence to Dimitrios Raptakis.

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Raptakis, D., Makra, K., Anastasiadis, A. et al. Complex Site Effects in Thessaloniki (Greece): II. 2D SH Modelling and Engineering Insights. Bull Earthquake Eng 2, 301–327 (2004). https://doi.org/10.1007/s10518-004-3803-1

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  • DOI: https://doi.org/10.1007/s10518-004-3803-1

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