Morphotectonic analysis of Aghajari fault


Department of Geology, Faculty of Earth Sciences, Shahid Chamran University of Ahvaz, Ahvaz, Iran


The Geomorphic indices including mountain front sinuosity (Smf), valley floor width to valley height ratio (Vf), basin shape index (Bs), and stream length–gradient index (SL) have been calculated for determination of various tectonic activities along the Aghajari fault. The mountain front sinuosity (Smf) index was calculated about 1.007 to 1.58 respectively in the active and inactive parts of the Aghajari fault. The basin shape (Bs) index has been calculated between 7.83 for the very active parts and, 1.18 for the low active parts of the fault. The amounts of valley floor width to valley height ratio (Vf) index show the range between 0.21 to 5.29 in the active parts with V shape valley morphology and inactive parts with U shape valley morphology respectively. The stream length–gradient (SL) index was calculated between 1414.58 in the high active tectonic and 385.14 in the low active tectonic parts of the study area. With application of the GIS techniques and the overlaying the Smf, Bs, Vf and SL data layers the area was divided into three different tectonic zones and quantitative active tectonic zoning map was prepared for the study area. In this active tectonic map, classes 1 to 3 respectively show the highest to lowest tectonic activity along the Aghajari fault. Results reveal that the Aghajari fault in the central and southeastern parts except for some small areas shows the medium tectonic activity and in the northwestern parts shows the low tectonic activity manner.


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