R. Alipoor; A. H. Sadr; S. Ghamarian
Abstract
This study aims at analyzing structural lineaments, fractures and blind faults of the Avaj - Abegarm region and determining the related fractal patterns using remote sensing techniques. The lineaments map was extracted using appropriate algorithms of spatial data, Landsat 8 satellite images and Shaded ...
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This study aims at analyzing structural lineaments, fractures and blind faults of the Avaj - Abegarm region and determining the related fractal patterns using remote sensing techniques. The lineaments map was extracted using appropriate algorithms of spatial data, Landsat 8 satellite images and Shaded Relief Model with a semi-automatic method, and then field studies and instrumental recorded earthquakes have been used for identification of structural lineaments. The fractures pattern and structural lineaments of the study area were calculated using fractal analysis and Box Counting method and fractal dimension obtained in the Hassanabad and Avaj fault zones from Log–log plots. Based on calculated fractal dimensions of structural lineaments, location of the longitudinal faults and epicenter of destructive Changureh - Avaj 2002 earthquake, the Abdareh and Kharrud faults are active blind faults beneath the alluvial deposits of the study area,. The density of faults in the Hassanabad fault zones and the higher fractal dimension of fractures in this zone in comparison with the Avaj fault zone, indicate higher activity level of the Hassanabad and KharRud faults.
A. H. Sadr; Mohammad Mohajjel; A. Yasaghi
Abstract
The style of deformation changes from the hinterland (Sanandaj-Sirjan zone) to the foreland (Zagros) through the Zagros Orogen containing thick-skinned and thin-skinned deformation respectively. NW-SE trending thrust faults dipping to northeast have carried the older rock sequences to the surface. The ...
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The style of deformation changes from the hinterland (Sanandaj-Sirjan zone) to the foreland (Zagros) through the Zagros Orogen containing thick-skinned and thin-skinned deformation respectively. NW-SE trending thrust faults dipping to northeast have carried the older rock sequences to the surface. The Zagros collision zone could be divided into two distinct parts based on deformation mode that is separated by the Main Zagros Thrust. The southwestern part contains imbricate thrust sheets instead, to the northeastern part large amount of shortening is documented by basement deformation with duplex structures. Abundant crystalline deep origin thrust sheets have transported (2 up to 20 km) the metamorphic rock units upon the Zagros suture zone by gravity or tectonic forces. Despite the collision thrust faults, both NW oriented (Main Recent Fault) and NE oriented (named here Azna Fault) basement wrench faults have also activated and caused different style and amount of deformation in the collision zone.