Abstract

The most active tectonic areas based on morphotectonic indices is the main aim of this study, are characterized. Mechanical deformation resulting mostly from the Arabia-Eurasia collision is amalgamated by the Alborz Mountains in the form of folding and faulting. The proposed area includes the Alborz province in northern Iran as part of the Alborz mountain range that has seismogenic faults and large earthquakes. Therefore, the basins’ morphologies and shapes are associated with tectonic activity. In this study, the morphometric indices of valley height-width (Vf), asymmetry factor (Af), basin shape (Bs), topographic symmetry factor (T), hypersonic curve (Hc), hypersonic integral (Hi), and river sinuosity (S) were measured for the 33 number basins to assess tectonic activity. Using indices of related active tectonics (IRAT) and weighting and combining morphometric indices, a map was prepared that showed an eye-shaped area at the center of the study area (Hashtgerd) that had high tectonic activity. The tectonic setting survey specified a crush zone because of the collision of active faults near Hashtgerd. A comparison of field observations clearly indicated that the highly active eye-shaped area had a good correlation with the crushed zone and hypocenter of large earthquakes.

中文翻译：

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阿尔伯兹省（伊朗）的地貌构造：以GIS方法为例

摘要

基于形态构造指数最活跃的构造区是本研究的主要目的，进行了表征。大部分由阿拉伯-欧亚大陆碰撞引起的机械变形被阿尔伯兹山脉以折叠和断层的形式融合在一起。拟建地区包括伊朗北部的阿尔伯兹省，这是阿尔伯兹山脉的一部分，该山脉有地震成因断裂和大地震。因此，盆地的形态和形状与构造活动有关。在这项研究中，山谷高宽（Vf），不对称因子（Af），盆地形状（Bs），地形对称因子（T），高超音速曲线（Hc），高超音速积分（Hi）和河流弯曲度的形态计量指标测量了33个盆地的（S），以评估构造活动。使用相关活动构造指数（IRAT）和权重并结合形态计量学指数，制作了一张图，该图显示出处于研究区域中心的眼睛形区域（Hashtgerd）具有较高的构造活动。由于Hashtgerd附近活动断层的碰撞，构造背景调查确定了一个挤压带。现场观察的比较清楚地表明，高度活跃的眼形区域与大地震的压碎带和震源具有良好的相关性。