Himalayan Geology, Vol. 44 (1), 2023, pp. 60-70, Printed in India
Relative tectonic activity classification in the Chalus drainage basin, north of Iran
MASUMEH HAJ MANUCHEHRI1, MEHRAN ARIAN1*, ALI SOLGI1, ALI SORBI2
1Department of Earth Sciences, Science and Research Branch, Islamic Azad University, Tehran, Iran
2Department of Geology, Karaj Branch, Islamic Azad University, Karaj, Iran
*Email (Corresponding author): mehranarian@yahoo.com
Abstract: Geomorphic indices have the advantage of being calculated from Arc GIS and remote sensing packages such that large area can be investigated rapidly and thus it can act as a reconnaissance tool to identify geomorphic anomalies possibly related to active tectonics. Based upon values of the stream length – gradient index (SL), drainage basin asymmetry (Af), hypsometric integral (Hi), ratio of valley – floor width to valley height (Vf), index of drainage basin shape (Bs), and index of mountain front sinuosity (Smf), we used an overall index of active tectonics (IAT) which is a combination of the other indices that divides the landscape into four classes of relative tectonic activity. The sub-basins of 4 and 6 show the low class of IAT, while rest of the study area has moderate to high active tectonics.
Keywords : Active Tectonics, Asymmetry, Alborz, Chalus, Iran
