Evaluating the effects of neotectonic activities on basin shape Indices (case study: Zanjanroud sub-basins)

Document Type : Original Article


1 Department of Physical Geography,, Faculty of Geography, University of Tehran, Tehran, Iran

2 Professor of Geography, University of Tehran

3 Department of Geography, Faculty of Geography, University of Tehran, Tehran, Iran

4 Department of Physical Geography, Faculty of Geography, University of Tehran, Tehran, Iran



Neotectonic movements after the establishment of the contemporary stress regime in each region are considered to be new tectonics of that region. Examining the morphology of basins using different indices is one of the methods of estimating the state of neotectonics in different areas. Zanjanrud is one of the main basins of Zanjan province, which is of vital importance. The aim of the current research is to investigate and compare the neotectonics of Zanjanrud sub-basins using different indices of the basin shape and therefore geological information, topography, DEM and GIS, WMS and Excel software have been used. The results showed that 8 sub-basins with the highest figures of the shape index are located in the northwest side of the basin which indicates the highest level of involvement of neotectonic compared to other parts. The presence of 5 sub-basins with a basin shape index higher than 4 in the northwest area can also strengthen the hypothesis that the level of neotectonic activity in the western half is higher than the eastern one. These results are consistent with the distribution of active faults in the region. Out of 18 sub-basins with a low tectonic dynamic level, the frequency of sub-basins is higher in the southeastern half of the basin. The analytic results showed that the southeastern side was in the third place in terms of the dynamics and involvement of active tectonics, and the northeastern side has the lowest level of neotectonic activity compared to other parts of the Zanjanrud basin.


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