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Spectral decomposition of S-waves in investigating regional dependent attenuation and improving site amplification factors: A case study in western Greece

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Abstract

Seismic-hazard analysis is based on the knowledge of the factors that configure the wave attenuation properties due to the loss of energy radiated away from the source (geometrical spreading and anelastic attenuation) and the site amplification due to surface geological conditions (the so-called site effects). Both factors can be separately investigated based on Generalized Inversion Techniques (GIT), through spectral decomposition of earthquake recordings in terms of Fourier Amplitude Spectra (FAS). In this study a parametric GIT algorithm, was applied in western Greece, allowing a simultaneous spectral decomposition of S-wave records in order to estimate parameters controlling seismic motion. The analyses provided a regional variation of the quality factor, Qs between 23—91, with a geometric mean value of 45, a distance dependent geometrical spreading attenuation factor gamma, γ, smoothly decreased between 12 and 200 km, from 0.98 to 0.77, as well as Site Amplification Factors for both horizontal and vertical components of 24 sites located in the study area. Moment Magnitudes, Mw and corner frequencies, fc, were computed for the examined earthquakes, indicating an increasing trend of stress drop, Δσ from ~ 6 to ~ 55 bar for Mw = 2.5 to 5.2. The estimated values of these parameters, are in good agreement with the corresponding ones based on other methodologies, concluding to the relevant low average logarithmic misfit (~ 0.17) between observed and synthetic FAS. Consequently, attenuation and site amplification factors computed in this study, can provide rational input parameters for stochastic S-wave simulations, improving thus deterministic seismic hazard assessment.

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Data availability

The Matlab scripts of the GIT algorithm used in this study are freely available up on request to the first author.

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Acknowledgements

We thank Institute of Engineering Seismology and Earthquake Engineering (ITSAK) for providing the data used in this study. Also, we would like to thank the two Unknown reviewers of BEE, for their constructive review and comments, that improved the quality of the manuscript. The maps of this study were created by the use of the free software: Generic Mapping Tools (http://gmt.soest.hawaii.edu/ , Wessel and Smith 1998).

Funding

This research is based on a Ph.D. thesis currently conducted by the first author (I.G.) which is co-financed by Greece and the European Union (European Social Fund- ESF) through the Operational Programme «Human Resources Development, Education and Lifelong Learning» in the context of the project “Strengthening Human Resources Research Potential via Doctorate Research” (MIS-5000432), implemented by the State Scholarships Foundation (ΙΚΥ), and has been partially funded by the Sigma-2 & SIREAT-ITSAK KE2.027 projects.

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  1. Geophysical Laboratory, Aristotle University of Thessaloniki (AUTh), Thessaloniki, Greece

    I. Grendas & P. Hatzidimitriou

  2. Institute of Engineering Seismology and Earthquake Engineering (ITSAK), Thessaloniki, Greece

    I. Grendas & N. Theodoulidis

  3. Institute of Earth Sciences (ISTerre), University of Grenoble Alpes, Grenoble, France

    F. Hollender

  4. Atomic Energy and Alternative Energies Commission, Centre d’Etude de Cadarache (CEA), Cadarache, France

    F. Hollender

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Grendas, I., Theodoulidis, N., Hollender, F. et al. Spectral decomposition of S-waves in investigating regional dependent attenuation and improving site amplification factors: A case study in western Greece. Bull Earthquake Eng 20, 6441–6465 (2022). https://doi.org/10.1007/s10518-022-01459-z

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