COMPARISON OF THE NEW SEISMIC HAZARD MAP OF SLOVENIA (2021) WITH THE EUROPEAN AND NEIGHBOURING COUNTRIES‘ MAPS
Abstract
In 2021, the Slovenian Environment Agency (ARSO) completed a seven-year project on the development of a new seismic hazard model in Slovenia. The most important result is the design ground acceleration map, a supplement to the National Annex of the earthquake-resistant design standard Eurocode 8. The earthquake hazard is greatest west of Bovec, where the PGA value on the new map is 0.325 g (gravitational acceleration). A high seismic hazard (0.300 g) is also estimated in the Idrija (west Slovenia) and Brežice/Gorjanci (east Slovenia) areas. The higher seismic hazard zone (0.275 g) also includes Ljubljana and its surrounding areas. The development of the Slovenian seismic hazard model was carried out in parallel with the project of updating the European seismic hazard model (ESHM20). We collaborated with the experts of the ESHM20 project. A comparison of the maps shows that the range of values on both maps is similar, but in the western part of Slovenia, they differ slightly due to different procedures. A comparison of maps of neighbouring countries shows that the spatial distribution of the estimated seismic hazard is similar, but the absolute values differ due to the differing approaches to seismic modelling and different ground-motion models used.
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