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Active tectonics analysis of the Kalmard fault zone, Central Iran

  • M. Moumeni-Taromsari
  • M. Dehbozorgi
  • R. Nozaem
  • A. Yassaghi
Original Paper

Abstract

Central-East Iran has numerous active Quaternary faults. This paper focuses on the analysis of geomorphic and structural characteristics of the Kalmard fault zone, including major NE–SW striking fault segments that cuts across the basement and the sedimentary cover in the Ozbak-Kuh area of Central-East Iran. Because of the absence of definite earthquakes through the Kalmard fault zone in contrast to other parts of Central Iran, we used morphotectonic methods in combination of structural studies to evaluate active tectonics of this area. Detailed structural assessment of satellite images and analysis of geomorphic indices, together with field surveys allowed us to evaluate the recent tectonic activity and support a Quaternary age for it. We used six morphometric indices including the stream-gradient index (SL), drainage basin asymmetry (Af), hypsometric integral (Hi), valley floor width–valley height ratio (Vf), drainage basin shape (Bs), and mountain-front sinuosity (Smf). We combined these indices to yield the relative active tectonics index (Iat). Based on Iat values, the study area includes class 1 (very high activity), class 2 (high), class 3 (moderate), and class 4 (low). Also the normalized steepness index (Ksn) represents a significant pattern of high values in the eastern and southeastern parts of the study area which correspond with high values of Iat index. The output is consistent with both landforms and structures observed during the field work. In particular, the high relative tectonic activity (classes 1 and 2) largely corresponds to F1 (the eastern segment of the Kalmard Fault Zone) in the Ozbak-Kuh area, while the moderate class of tectonic activity caracterizes F2 (the western segment of the Kalmarad Fault Zone). The older geological structures in the middle part of the area show the lowest relative tectonic activity. The results of this study indicate that the Kalmard fault zone is one of the major Quaternary fault zones of Central-East Iran which is potentially active.

Keywords

Active tectonics Geomorphic indices Kalmard fault zone, Ozbak-Kuh Central-East Iran 

Notes

Acknowledgments

The authors appreciate Professor Federico Rossetti and Professor Paolo Ballato of Roma Tre University for their useful comments and precious time to improve our manuscript. Also, we would like to thank Shima Babaei for her great help.

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Copyright information

© Saudi Society for Geosciences 2018

Authors and Affiliations

  • M. Moumeni-Taromsari
    • 1
  • M. Dehbozorgi
    • 1
  • R. Nozaem
    • 2
  • A. Yassaghi
    • 3
  1. 1.Department of Earth SciencesKharazmi UniversityTehranIran
  2. 2.School of Geology, College of ScienceUniversity of TehranTehranIran
  3. 3.Faculty of ScienceTarbiat Modares UniversityTehranIran

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