Proposal for a new seismic hazard zonation map for Greece

The current seismic hazard zonation map in Greece, published in 2003 following the catastrophic earthquakes that hit Greece between 1978 and 2001, includes three seismic hazard zones with PGA ranging between 0.16g and 0.36g. In the last two decades, a significant progress has been made towards the improvement of the seismic hazard maps worldwide using fully probabilistic models. At European level, in December 2021 the European Seismic Hazard Model ESHM20 was released, built upon recently compiled and fully cross-border harmonized datasets, information and models. One of the main goals of ESHM20 was to interact with the subcommittee responsible for the ongoing revision of Eurocode 8 within the European Committee for Standardization (CEN). Within this context, in this paper we propose a new seismic hazard zonation map for Greece, based on the results of ESHM20, for potential inclusion in the Greek National Annex which will accompany the revised Eurocode 8. The herein proposed zonation for rock sites according to EC8 with Vs>800m/s, includes four zones with PGA values ranging between 0.12g and 0.37g. For each zone the parameters Sα,475 and Sβ,475 are provided, which are the two seismic hazard parameters adopted in the revised Eurocode 8