Investigation of the relationship between tectonic morphological indices and seismic acceleration in Indes, Aipak, Avaj and Kushk-e-Nusrat fault zones (northwest of Saveh)

Journal of Radar and Optical Remote Sensing and GIS

مقاله 2، دوره 5، شماره 3، شهریور 2022، صفحه 22-42   

نوع مقاله: مقاله پژوهشی

شناسه دیجیتال (DOI): 10.30495/jrors.2023.1975789.1170

نویسندگان

Bahar Rezaei Nahal¹؛ Mohsen PourKermani^{* 2}؛ Mehdy Zare³؛ Maryam Dehbozorgi⁴؛ Reza Nozaem⁵

¹Department of Geology ,Islamic Azad University,North Branch,Tehran,Iran

²Department of Geology , Faculty Member of Islamic Azad University,North Branch,Tehran,Iran

³Department International Institute of Earthquake Engineering and Seismology(IIEES),Professor of Engineering Seismology,Tehran,Iran

⁴Department of Geology , Assistant Professor of Kharazmi University,Tehran,Iran

⁵School of Geology ,College of Science,Univercity of Tehran,Tehran,Iran

چکیده

The northwest zone of Saveh city is located in the Indes , Kooshk e Nosrat, Avaj and Ipak fault zones. Indes, Kooshk e Nosrat, Avaj and Ipak faults are considered as the major faults in central Iran, which are also active in the Quaternary and the their last movements are attributed to the present time, therefore, the estimation of morphometry in order to identify the effect of active tectonics on the tectonic evolution of drainage basins seems necessary. Therefore, in this study, six important morphotectonic indices were analyzed including longitudinal gradient of the river, asymmetry of drainage basin, hypsometric integral, Drainage basin shape, the ratio of the floor width to the valley height and mountain front. In order to model the formation of basins in the studied area, Arc Hydro software (Arc GIS add ins) has been used based on data derived from a digital elevation model. Then, 6 morphotectonic indices have been compiled and classified on each of the basins. Finally the Active Tectonic Index (IAT) has been calculated, according to which the study area has been classified into 4 categories including very high, high, intermediate and low tectonic activity. According to the IAT index, 5% of the study area shows very high tectonic activity, 25% of the studied area has high tectonic activity, 65% of it has the average tectonic activity and about 5% of the tectonic activity are low. In this study, the highest level of tectonic activity can be seen in the north-eastern part of the area. In most sectors, the level of activity is high and intermediate, which is related to the activity of Kooshk-e-Nosrat, Aipak and Avaj faults.The northwest zone of Saveh city is located in the Indes , Kooshk e Nosrat, Avaj and Ipak fault zones. Indes, Kooshk e Nosrat, Avaj and Ipak faults are considered as the major faults in central Iran, which are also active in the Quaternary and the their last movements are attributed to the present time, therefore, the estimation of morphometry in order to identify the effect of active tectonics on the tectonic evolution of drainage basins seems necessary. Therefore, in this study, six important morphotectonic indices were analyzed including longitudinal gradient of the river, asymmetry of drainage basin, hypsometric integral, Drainage basin shape, the ratio of the floor width to the valley height and mountain front. In order to model the formation of basins in the studied area, Arc Hydro software (Arc GIS add ins) has been used based on data derived from a digital elevation model. Then, 6 morphotectonic indices have been compiled and classified on each of the basins. Finally the Active Tectonic Index (IAT) has been calculated, according to which the study area has been classified into 4 categories including very high, high, intermediate and low tectonic activity. According to the IAT index, 5% of the study area shows very high tectonic activity, 25% of the studied area has high tectonic activity, 65% of it has the average tectonic activity and about 5% of the tectonic activity are low. In this study, the highest level of tectonic activity can be seen in the north-eastern part of the area. In most sectors, the level of activity is high and intermediate, which is related to the activity of Kooshk-e-Nosrat, Aipak and Avaj faults.

کلیدواژه‌ها

Active tectonic؛ Morphometric indices؛ Kooshk-e-Nosrat fault؛ Indes fault؛ Avaj fault؛ Ipak fault؛ Central Iran

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