Active tectonics and kinematics of Fethiye-Gocek Bay, SW Turkey


Thesis Type: Postgraduate

Institution Of The Thesis: Orta Doğu Teknik Üniversitesi, Faculty of Engineering, Department of Geological Engineering, Turkey

Approval Date: 2018

Student: LEVENT TOSUN

Supervisor: NURETDİN KAYMAKCI

Abstract:

Tomographic studies conducted in Eastern Mediterranean region reveal that Pliny-Strabo Trench corresponds to a tear known as "STEP" (Subduction Transform Edge Propagator) fault connecting the Aegean and Cyprean trenches along the northern edge of the northward subducting African lithosphere. Recently, it is claimed that Fethiye-Burdur Fault Zone, which interpreted as a sinistral transtensional shear zone, is the northeaster continuation of this fault. In order to test this hypothesis, a rigorous study aiming at unravelling the characteristics and kinematic of the faults developed around the Fethiye-Göcek Bay located at the northeastern termination of the Pliny-Strabo Trench from off-shore to on-shore was conducted. In this context, totally 228 km long, 32 seismic lines collected from the Fethiye-Göcek Bay, are interpreted and faults cutting the seabed were mapped. In addition, the on-land continuation and characteristics of these faults were verified in the field. For this purpose, about 15.000 fault slip data from 222 locations within the bay and its vicinity were collected and analyzed. According to obtained results, all of the faults are developed under approximately NW-SE directed extension, except some NW-SE-striking faults, which have strike-slip components contrary to proposed sinistral nature of alleged Fethiye-Burdur Fault Zone. There is not any tangible evidence that supports the existence of a sinistral transtensional shear zone in the region. It is claimed that Pliny-Strabo Trench does not propagate on-land along a NE-SW striking major sinistral strike-slip shear zone in the region, and that existence and characteristics of the Fethiye-Burdur Fault Zone are therefore debatable.