Abstract
Morphotectonic analysis by the use of geomorphic indices serves as a tool of recognition in regions with active tectonic deformation. Landforms in active deformation area are created from interaction of tectonic and surficial processes. One of the most important landforms in ground are rivers that are very sensitive to tectonic movements especially uplift and tilting. Thus based on analysis of the rivers and related drainage networks by the use of geomorphic indices we will be able to attain valuable information about tectonic history of the area. In this article, determine of tectonic movements bye the use of geomorphic indices is surveyed in the Ghezel Ozan River basin between 2007 and 2010. After segmentation of the Ghezel Ozan River and preparation of digital elevation model (DEM) amounts of geomorphic indices per segments is separately attained. The attained amounts show that different segments of the Ghezel Ozan River vary from each other regarding the amount of tectonic activity and tectonic movements increase from west to east and also, the amount of tectonic tilting is negligible in a lot of the Ghezel Ozan River segments. This situation is completely in agreement with the trend of the seismicity of the area.
Highlights
Morphotectonic is the study of landforms produced by tectonic processes
In order to measure the stream length gradient index, first the small-scale streams are isolated on the digital elevation model (DEM) and for each stream, SL index is calculated by the use of equation (1)
The highest values of SL index is related to F segment whereas the vast parts of this segment is covered by weak sedimentary rocks such as weak cemented conglomerates and alternation of marl, gypsum and sandstone (Nazari and Salamati, 1998; Amini, 2004)
Summary
Morphotectonic is the study of landforms produced by tectonic processes. In order to assess relative degree of tectonic activity in an area the results of several indices are usually combined. Analysis of landforms is known as a valuable tool in tectonic investigations related to several thousands to two million years ago. Fast sedimentation can cover young structures, in these cases geomorphic indices are very useful for the type of processes that make of landforms especially analysis of drainage pattern and rivers can help to the recognition of the position of active structures (Burbank and Anderson, 2001). Morphometric data combined with seismic and geomorphic data seem to be a valuable tool in determining relative levels of tectonic activity and in providing data for seismic hazard assessment
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