Mt. Nemrut volcano, situated at the west of Lake Van, is one of the historically active volcanoes of the Eastern Anatolia. It has an 8.5 x 7 km diameter summit caldera. Volcanic activity of Mt. Nemrut started similar to 1 Ma ago; the most recent eruptions were in 1441, 1597 and 1692 A.D. Among the Eastern Anatolian volcanoes, Mt. Nemrut is the most hazardous volcano for its vicinity. Present day volcanic activity is represented by intra-caldera hydrothermal and fumarolic output and low-level volcano-seismic events.