Failure effect of earthquake in Greece: A method for determining the restoration

The unexpected effect of a distant earthquake is studied in this paper, which caused a landslide at the eastern part of the hotel "Atrium" in Thassos Island, Northern Aegean Sea in Greece. The area is geologically located in the tectonic active fault damage zone of gneiss and sandstone. The movement of the fault was activated by the earthquake and accelerated the slope sliding. In order to describe the mechanism of the sliding and decide the appropriate restoration, the rock mass classification of Blastability Quality System (BQS) is used. The results are combined with those of the classical Slope Mass Rating (SMR) classification system and it is showed that both estimates are really close. Considering the presence of the active fault and the rock mass quality as it was estimated by the above classifications, the restoration can be a flexible system with gabions and benches which follow the geometry of the potential critical sliding cycle so, it can absorb the fault movement during future earthquakes. The cracked small wedges can be prevented from sliding by wire mess. In addition to all of them, a drainage system and toe ditch needs to drive the water of the rainfall out of the slope.