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The seismic hazard for the Lake Van basin is computed using a probabilistic approach, along with the earthquake data from 1907 to present. The spatial distribution of seismic events between the longitudes of 41-45°and the latitudes of 37.5-40°, which encompasses the region, indicates distinct seismic zones. The positions of these zones are well aligned with the known tectonic features such as the Tutak-Ç aldıran fault zone, the Ö zalp fault zone, the Gevaş fault zone, the Bitlis fault zone and Karlıova junction where the North Anatolian fault zone and East Anatolian fault zone meet. These faults are known to have generated major earthquakes which strongly affected cities and towns such as Van, Muş, Bitlis, Ö zalp, Muradiye, Ç aldıran, Erciş, Adilcevaz, Ahlat, Tatvan, Gevaş and Gürpınar. The recurrence intervals of M s C 4 earthquakes were evaluated in order to obtain the parameters of the Gutenberg-Richter measurements for seismic zones. More importantly, iso-acceleration maps of the basin were produced with a grid interval of 0.05 degrees. These maps are developed for 100-and 475-year return periods, utilizing the domestic attenuation relationships. A computer program called Sistehan II was utilized to generate these maps.

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Hasankeyf and the surrounding area, with historic buildings and caves, is one of Turkey's most important cultural heritage. A significant part of this cultural heritage consisting of limestones will be under the influence of the Ilısu dam reservoir. Determination of the degree of the effects of the caves and the rocks surrounding the dam lake to be affected by water will be important in terms of taking necessary precautions. In this study, the water and salt resistance of the samples taken from the limestones in the historical Hasankeyf region, which is also used as a building stone, was determined by using slake durability and salt crystallization experiments, respectively. The data obtained showed that Hasankeyf limestones were significantly affected by water and salt.