Investigation of tectonic structures in the area between Marmaris and Fethiye Bay

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2019
Yavuzoğlu, Ayhan.
The relationship between, and continuum of, the Fethiye-Burdur Fault Zone (FBFZ) and Pliny-Strabo STEP fault zone are still debated and different school propose different models on the subject. The area between Finike Bay in the east and Datça Bay in the west along the Mediterranean Sea coastline forms one of the key locations because it lies at the linkage of the two major structures. This research therefore aims to address the existing controversies, shed light on the structural features in the northeastern part of the STEP fault zone and enlighten tectonic evolution of the STEP fault zone and the Anatolian Plate. Seven 2D seismic sections (352 km long marine seismic data collected by MTA Sismik-1 ) are interpreted not only to explaining tectonic evolution of post- Messinian succession but also for understanding the active tectonic structures in the present area. Seismic interpretation revealed two main deformation periods until recent tectonic regime and presence of NE-SW striking faults in the region. Focal mechanism solution of the most representative 6 (six) major earthquake are also carried out and the results indicate presence of mostly dextral also sinistral faulting as well in study area. Correlation of focal mechanism solution and seismic interpretation indicate right-lateral strike-slip faulting is not compatible with the regional constraints that suggest left-lateral strike-slip faulting both in the FBFZ and the Pliny-Strabo STEP fault zone. This brings more confusion about the nature of faulting in the region. It is therefore suggest more detailed work is required for further discussion.