The character and displacement of Adıyaman fault (Southeast Anatolia): Evidence from subsurface data

Thesis Type: Postgraduate

Institution Of The Thesis: Middle East Technical University, Graduate School of Natural and Applied Sciences, Graduate School of Natural and Applied Sciences, Turkey

Approval Date: 2019

Thesis Language: English


Supervisor: Erdin Bozkurt


Structural interpretation of five 2D seismic sections acquired by TPAO is carried out in the Adıyaman region of Southeast Anatolia. The sections are geological calibrated with stratigraphic logs of five boreholes. This study has resulted in the discovery of a previously undefined fault, herein named as Şambayat Fault. The fault is a NW-SEtrending structure that parallels the Bozova Fault and comprises several parallel fault segments. The structural maps of Cretaceous Sayındere and Karababa formations are also prepared and suggest that their sedimentation was controlled by the Şambayat Fault; it is therefore suggested that the Şambayat Fault was active during at least Campanian and because it appears not affecting the Middle Eocene-Oligocene Gaziantep Formation, its activity ceased by then. The segments of the Şambayat Fault is cut and displaced by the Adıyaman Fault. The correlation of these segments on either side of the Adıyaman Fault indicates a total sinistral displacement of about 4400 m. The Şambayat Fault is buried beneath younger sediments and has no surface expression suggesting its activity. Therefore, careful interpretation of seismic sections would be a useful method to identify and map buried structures that may have important implications on the geological evolution of a given region.