N Bagha; M Ghorashi; M Arian; M Pourkermani; A Solgi
Abstract
Structural development, caused by active tectonics leads to deformation of morphology features. The Mosha-North Tehran fault zone, located in south edge of the Central Alborz consists of significant tectonic structures. Hence, study on morphotectonic signs is a proper method for evaluation of relative ...
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Structural development, caused by active tectonics leads to deformation of morphology features. The Mosha-North Tehran fault zone, located in south edge of the Central Alborz consists of significant tectonic structures. Hence, study on morphotectonic signs is a proper method for evaluation of relative tectonic activities in the area. In this research, six main morphometric indices such as stream length-gradient (SL), drainage basin asymmetry (Af), hypsometric integral (Hi), ratio of valley-floor width to valley height(Vf), drainage basin shape (Bs), and mountain front sinuosity(Smf)were considered. The computations and probes of these indices indicate three classes of relative tectonic activity in the study area from low to high level. Consequently, the drainage basins with high class of tectonic activity mostly coincide with the main faults in south edge of the Central Alborz.
M. Abdideh; M. Qorashi; K. Rangzan; M. Aryan
Abstract
This paper present a new method for evaluating relative active tectonics based on morphometric indices useful in evaluating morphology and topography. Indices used include: Bifurcation ratio (BR), Basin Relief (Bh), Drainage Density (DD), Ruggedness number (Rn), Stream frequency (Fu), Form Factor (FF), ...
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This paper present a new method for evaluating relative active tectonics based on morphometric indices useful in evaluating morphology and topography. Indices used include: Bifurcation ratio (BR), Basin Relief (Bh), Drainage Density (DD), Ruggedness number (Rn), Stream frequency (Fu), Form Factor (FF), Shape Factor (Ll), Sinuosity (Sl) and Elongation ratio (Re) of drainage basin. Results from the analysis are accumulated and expressed as an index of relative active tectonics, which we divide to from relatively low to highest tectonic activity. The study area in the central Zagros fold – thrust belt of the south western Iran is an ideal location to test the concept of an index to predict relative tectonic activity on a basis of area rather than river system or mountain front. The study area has variable rates of active tectonics resulting from the collision between the continental Arabian plate and the so – called Iranian block belonging to Eurasia that has produced linear NW – SE anticline forms and thrusts. We test the hypothesis that areas of known, relatively high rates of active tectonics are associated with indicative value index of relative active tectonics.
