Active tectonics and seismicity of the Dalaman basin

Southwestern Türkiye, which is under the influence of the Western Anatolian extensional system and the Rhodes shear zone, is a seismically highly active region. The Dalaman Basin, which is the subject of this study, is located in a critical area in terms of the relationship and effects of these two tectonic regimes. It is understood from the seismicity of the region that active faults are common in the region. However, in most of the active fault maps and studies including the Dalaman Basin and its surroundings, data on well-defined active faults in this area are quite limited. Within the scope of this thesis, structural geology and paleoseismology studies were carried out in order to define the faults controlling the Dalaman Basin in detail and to determine the history of seismicity. During the field studies, the stress directions and physical properties of the faults observed around the basin were determined. According to the obtained results, it was concluded that the basin is under the control of normal faults and the basin is under extension in NE-SW and NW-SE directions. In addition, in order to investigate the earthquake history of the Dalaman Basin in the Holocene, two paleoseismological trenches were dug and examined in suitable areas on the Karadonlar fault, which bounds the basin from the west, but no earthquake traces were found in the trenches.