Morphometric analysis of active tectonic imprints at the junction of Büyük Menderes and Bozdoğan grabens, Western Anatolia

Download
2015
Usta, Sultan Gamze
Analysis of the basin asymmetry and morphometric indices is an effective methodology to detect surface signatures of active tectonic processes and to understand the differential uplift. Thus, basins controlled by active faults with different orientations provide a unique opportunity to evaluate fault controlled tilting. In this study, a morphometric analysis is conducted by means of the analytical capabilities of numerical computing and GIS software for an area characterized by orthogonal normal faults and nearly homogeneous lithology situated at the junction of Büyük Menderes and Bozdoğan graben systems. The morphometric parameters such as isobase, incision, surface roughness and basin asymmetry parameter; T-index are extracted to recognize tectonic control on drainage network development, basin morphology and landscape evolution. In order to reveal the useful and consistent information some output maps have been modified and new maps such as "DEM-Isobase" derived from output maps have been generated. Watershed based variations of output maps and new maps have been produced for further analysis by using the mean values of each parameter which have been calculated within each watershed. Tectonically controlled watersheds have been interpreted to be dominant around active faults. For this reason, analysis has concentrated on the areas around active faults. Fault based analysis reveals that dominant asymmetry direction along the western part of Büyük Menderes fault is toward SW indicating the possible uplift of the south east of Madran horst. The results of morphometric analysis conducted in this thesis study also enable to discuss the comparison of the tectonic activities of Büyük Menderes and Bozdoğan faults and shows that Bozdoğan fault is more active on the drainage network development, basin morphology and landscape evolution compared with Büyük Menderes fault.
Citation Formats
S. G. Usta, “Morphometric analysis of active tectonic imprints at the junction of Büyük Menderes and Bozdoğan grabens, Western Anatolia,” M.S. - Master of Science, Middle East Technical University, 2015.