A Logic-Tree Approach for Probabilistic Seismic Hazard Assessment in the Administrative Region of Attica (Greece)

Probabilistic Seismic Hazard Assessment (PSHA) was carried out for the administrative region of Attica (Greece). Peak Ground Acceleration (PGA) and Velocity (PGV) values were calculated return periods 475 950 years five sub-areas covering entire region. PGA hazard curves Uniform Spectra (UHS) in terms spectral acceleration (Sa) generated Athens, Methana, capitals each island (Salamina, Aegina, Poros, Hydra, Spetses, Kythira, Antikythira). Area sources adopted from Euro-Mediterranean Model 2013 (ESHM13) its update, ESHM20, taking into account both crustal slab tectonic environments. Motion Prediction Equations (GMPEs) proposed Greek territory ranked PGV. Each GMPE reconstructed as a weighted model, accounting normal non-normal focal mechanisms area source. PGA, PGV, Sa computed using logic tree, integrating seismotectonic models major branches sub-logic trees, comprised multiple GMPEs source, minor branches. The results showed higher seismic near Gulf Corinth interface, which could indicate need to revise active building code Attica.