Özet:

Yedisu Basin (Bingöl) is a pull-apart type tectonic basin formed on the North Anatolian Fault Zone (NAFZ). The Yedisu Basin is geographically located within the Upper Euphrates Section of the Eastern Anatolia Region of Turkey. The aim of this study is to determine the active tectonism in Yedisu Basin and its surroundings with geomorphological data. For this, literature data, geology and topography maps at various scales, 5*5 m resolution Digital Elevation Model, earthquake data, Google Earth images and field data were used. In the evaluation of the data, Geographic Information Systems (GIS), geomorphological methods and geomorphometric indices were used together. As a result of the study, it has been observed that many morphotectonic structures (pressure ridges, fault scarps, covering ridges, hanging valleys, offset streams, alluvial fans, landslides and terraces) are formed in Yedisu Basin and its surroundings due to the activity of the Yedisu Segment and its sub-branches. The tectonism, magmatism and fluvial processes that were effective in the Yedisu Basin and its surroundings during the Upper Miocene and Quaternary periods caused the slope values to be high in the area. As tectonism is more active in the south of the basin than in the north, the alluvial fans in the south have higher elevation and slope values than those in the north. The terraces had on Perisuyu Stream and its branches located in the Yedisu Basin have been deformed as a result of active tectonism, and many offset streams have occurred on the secondary branches. Again, many landslides triggered by active tectonism have occurred in and around the basin. According to morphotectonic data, geomorphometric indices and seismicity data, new faults have been proposed for Yedisu Segment in Yedisu Basin and its surroundings.

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