This study aims to evaluate the tectonic activities of the Vark basin, located in the great basin of Dez River in northwestern Iran, using geomorphologic indices combined with the geographical information system technique. Some geomorphic indices were used to achieve this aim. In this regard, the indices of stream length (SL), drainage asymmetry (Af), hypsometric integral (Hi), valley floor ratio (Vf), basin shape (Bs), and mountain sinuosity (Smf) were estimated to reach an average index of relative tectonics (Iat), indicating the intensity classes of tectonic activity. The mean SL, Hi, Vf, and Bs values were estimated as 2273, 0.55, 0.45, and 1.75, respectively, regarding the active class of tectonic activity. Therefore, considering the Af and Smf indices with values of 27 and 1.14, the basin was categorised as having semi-active conditions. The overall Iat, with a value of 1.33, represented the very high class (1.0 < Iat < 1.5) of tectonic activity. Hence, by calculating the index of relative active tectonics, the study area is observed as the intensive class concerning tectonic movements. Overall, the mean values of the Iat for all sub-basins were calculated as 1.50, 1.17, and 1.83, revealing the very high and high classes of active tectonics in the basin. The results obtained on tectonic activity were further confirmed during field observations by examining the structurally complex joints, folds, slips, faults, and fractures of the area, which reflect the dynamic nature of the regional tectonics.

中文翻译：

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利用伊朗山区盆地的地貌指数评价活动构造

本研究旨在利用地貌指标结合地理信息系统技术评估位于伊朗西北部德兹河大盆地的瓦克盆地的构造活动。一些地貌指标被用来实现这一目标。在这方面，河流长度（SL）、排水不对称性（一种F), 高程积分 (H一世), 谷底比 (五F), 盆形 (乙s) 和山脉弯曲度 (小号MF) 估计达到相对构造的平均指数 (一世在)，表示构造活动的强度等级。平均 SL，H一世,五F， 和乙s关于构造活动的活动类别，值分别估计为 2273、0.55、0.45 和 1.75。因此，考虑到一种F和小号MF指数为 27 和 1.14，盆地被归类为半活跃状态。整体一世在, 值为 1.33, 代表非常高的等级 (1.0 <一世在< 1.5) 的构造活动。因此，通过计算相对活动构造指数，将研究区视为构造运动的密集类。总体而言，平均值一世在对所有子盆地的计算结果分别为 1.50、1.17 和 1.83，揭示了盆地活动构造的非常高和高等级。通过对该地区结构复杂的节理、褶皱、滑动、断层和裂缝的实地观测，进一步证实了构造活动的结果，这些活动反映了区域构造的动态性质。