Abstract
Boroujerd area has located in the border zone of Zagros mountain and Sanandaj-Sirjan belt in the southwest Iran. Six geomorphic indices were calculated in the study area. Through averaging these indices we obtain index of active tectonics (Iat). The values of the index were divided into classes to define the degree of active tectonics. Therefore, relative tectonic activity was calculated and their values were classified and analyzed in two groups. Regions were identified as low and moderate levels. In analyzing data and combining them with tectonic setting the results were often associated and justified with regional geology. Our results show that the highest value has located along faulted area, which shows 3 classes of relative tectonic activity (moderate level). Also, other values have located along folded area (low level). Therefore, middle part of study area (sub-basin No. 4) is showing the more active uplifting related to surroundings region (sub-basin No. 1, 2 and 3). In other words, sub-basin No. 4 has got the more active uplifting by quaternary movements of several faults such as Doroud fault.
Highlights
The study area is around Boroujerd city in the border zone of Zagros hinterland and Sanandaj-Sirjan belt in the south west Iran (Figure 1)
The calculated geomorphic indices are suitable for assessment of tectonic activity of the study area
There is a formula which we turn to describe each one of indices; It is necessary to have some primary maps to calculate the indices, and the most important of which are: Digital Elevation Model (DEM), the drainage network and the sub-basins map of the Boroujerd area that have been extracted from DEM (Figure 4)
Summary
The study area is around Boroujerd city in the border zone of Zagros hinterland and Sanandaj-Sirjan belt in the south west Iran (Figure 1). This area is structurally and geographically belonging to Zagros Mountain. Its northeastern margin belongs to Sanandaj-Sirjan zone and its rest belongs to Zagros Mountain. These two zones have no similar geologic history. Sanandaj-Sirjan zone has comprised from some intrusive bodies in this area. How to cite this paper: Omidali, M., Arian, M. and Sorbi, A. (2015) Neotectonics of Boroujerd Area, SW Iran by Index of Active Tectonics.
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