The use of geological data to improve SHA estimates in Greece

The broader Aegean region is well known for the frequent and intense seismic activity which has caused great damages and human losses. In order to improve the seismic hazard assessment (SHA) in Greece and surroundings, several national and international projects were launched during the past years dealing with either the cause (seismogenic sources) and/or the result (ground effects). In this paper, we present the background and the state-of-the-art of two databases which contribute (each with its own way) to the SHA of Greece: GreDaSS (Greek Database of Seismogenic Sources) and DaLO (Database of Liquefaction Occurrences). Both databases are essentially built on geological information and investigation approaches and techniques. They confirm the important contribution of Earthquake Geology to an explicit improvement of our seismotectonic knowledge and to SHA analyses when this information is included in the estimates.