The Gediz Graben is one of the grabens formed due to the tectonic movements in the region. It is thought that this graben began to form in consequence of the formation of the Karadut fault which is a separation fault. There are listric faults to either side of the graben which have caused the graben to intermittently collapse. From the mountainous areas towards the plain the age of these faults become younger. The difference in height between the base of the graben and the highest part of the Bozdag Mountains is about 2000 meters. This difference in elevationis remarkable, clearly indicating the severity of the tectonic movements in the neo-tectonic period.