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Probabilistic seismic hazard assessment for Attica (Greece) utilizing crustal and slab seismotectonic models

Authors

Kaviris,  George
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Zymvragakis,  Angelos
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Bonatis,  Pavlos
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Spingos,  Ioannis
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Kapetanidis,  Vasilis
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Mavroulis,  Spyridon
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Kotsi,  Evelina
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Makropoulos,  Kostas
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Lekkas,  Efthymis
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Voulgaris,  Nicholas
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Kaviris, G., Zymvragakis, A., Bonatis, P., Spingos, I., Kapetanidis, V., Mavroulis, S., Kotsi, E., Makropoulos, K., Lekkas, E., Voulgaris, N. (2023): Probabilistic seismic hazard assessment for Attica (Greece) utilizing crustal and slab seismotectonic models, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-0811


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016650
Abstract
In this work, seismic hazard is evaluated for the Administrative Region of Attica (Greece) and its islands. The assessment is performed by computing Peak Ground Acceleration (PGA) and Peak Ground Velocity (PGV) values for return periods of 475 and 950 years for five separate groups to cover the entirety of the study area in detail. In addition, PGA hazard curves and Uniform Hazard Spectra (UHS), in terms of Spectral acceleration (Sa), are constructed for Athens and the capital of each island of Attica. The computational scheme contains two crustal seismotectonic models, i.e., the Euro–Mediterrenean Seismic Hazard Model 2013 (ESHM13) and its update ESHM20, and one slab seismotectonic model. Ground Motion Prediction Equations (GMPEs) proposed for the Greek territory are adopted and ranked for the crustal seismotectonic models. Each GMPE is re–constructed as a weight–specific model to account for both normal and non–normal fault plane solutions for each area source. The final results are obtained by implementing a logic tree, whose major branches are the three seismotectonic models and the minor branches the GMPEs. The latter reduces epistemic uncertainties due to the implementation of multiple logic tree paths per area source. The results indicated that seismic hazard is higher in groups that are close either to the Gulf of Corinth or the slab interface. The results could aid in the update of the building code in Attica.<br<brAcknowledgements:The present study is co-funded by the Special Account for Research Grants (S.A.R.G.) of the National and Kapodistrian University of Athens.