Neo-tectonic analysis of Shushtar fault using morphometric indexes

Document Type : Original Article

Authors

1 Faculty of Earth Sciences, Shahid Chamran University of Ahvaz, Ahvaz, Iran

2 Assistant Professor, Faculty of Earth science, Shahid Chamran University of Ahvaz

3 Master of Tectonics, Faculty of Earth science, Shahid Chamran University of Ahvaz

Abstract

The effect of Shushtar fault in the northern Dezful Embayment cases to several geomorphologic features that can be used to identification of geology and morphotectonic properties of the this fault. The Geomorphic indices including mountain front sinuosity (Smf), valley floor width to valley height ratio (Vf), basin shape index (Bs), stream length–gradient index (SL) and basin asymmetry index (Af) have been calculated for determination of various tectonic activities along the Shushtar fault. The mountain front sinuosity (Smf) index was calculated about 1.007 to 1.584 respectively in the active and inactive parts of the Shushtar fault. The stream length–gradient (SL) index was calculated between 898.11 in the high active tectonic and 242.8 in the low active tectonic parts of the study area. The basin shape (Bs) index has been calculated between 9.62 for the very active parts and, 2.04 for the low active parts of the fault. The amounts of valley floor width to valley height ratio (Vf) index show the range between 1 to 10.5 in the active parts with V shape valley morphology and inactive parts with U shape valley morphology respectively. Also the basin asymmetry index (Af) was calculated between 359.3 in the high active tectonic and 3.7 in the low active tectonic parts of the study area. With application of the GIS techniques and the overlaying the Smf, Bs, Vf, SL and Af 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 Shushtar fault. Results reveal that the Shushtar fault in the central and northwestern parts shows the medium tectonic activity and in the southeastern parts shows the low tectonic activity manner. Also results show the high tectonic activity in the some northwestern parts near the Shushtar city.    

Keywords

Journal of Tectonics
Volume 4, Issue 13
February 2021
Pages 1-21

Files

Share

How to cite

Statistics