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<p>The Folded Zagros, situated within the Alpine–Himalayan orogenic belt, is one of the most tectonically active regions due to its complex geodynamic setting, with different parts exhibiting varying levels of activity driven by regional dynamics. This study comprises two main components: (1) the calculation of morphometric indicators across the study area and (2) the identification of faults, analysis of their dominant structural trends, and evaluation of their relationships with morphometric indices and the region’s seismic history. Fourteen drainage basins were examined using seven geomorphic indices (AF, T, SMF, SL, Hi, Bs, and Vf), combined with GIS-based spatial analysis and the Analytical Hierarchy Process (AHP) to assess tectonic activity. These indicators were prioritized according to their explanatory significance and correlation coefficients to identify tectonic activity hotspots. The results indicate that the most active zones are associated with the Sabzepushan Fault, especially in the northwestern and western parts of Shiraz. The Dokuhak and Qasr-e-Ghomsheh areas exhibit the highest neotectonic index values. Additionally, half of the basins—Hezar, Bajgan, Dokuhak, Qasr-e-Ghomsheh, Akbarabad, Mishdan, Bordaj, and Qaravel—located along the region’s northeast–southeast axis show evidence of active ductile deformation, whereas the remaining basins display uplift patterns associated with brittle deformation. Evidence of both brittle (faulting, valley incision) and ductile (folding, flexural slip) deformation was documented, reflecting the complex geodynamic regime of the Zagros. The conclusions emphasize the regional geodynamic evolution and highlight practical implications for seismic hazard assessment, urban planning, and infrastructure resilience in Shiraz city.</p>

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Analysis of active faults using GIS methods and their relationship with tectonic morphometric indices in the Shiraz region (SW Iran)

  • 期刊论文

  • 发表日期：

    2026年2月2日

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  • Nazanin Haddad,
  • Kouros Yazdjerdi,
  • Abdolmajid Asadi,
  • Robabeh Shahamiri

摘要

The Folded Zagros, situated within the Alpine–Himalayan orogenic belt, is one of the most tectonically active regions due to its complex geodynamic setting, with different parts exhibiting varying levels of activity driven by regional dynamics. This study comprises two main components: (1) the calculation of morphometric indicators across the study area and (2) the identification of faults, analysis of their dominant structural trends, and evaluation of their relationships with morphometric indices and the region’s seismic history. Fourteen drainage basins were examined using seven geomorphic indices (AF, T, SMF, SL, Hi, Bs, and Vf), combined with GIS-based spatial analysis and the Analytical Hierarchy Process (AHP) to assess tectonic activity. These indicators were prioritized according to their explanatory significance and correlation coefficients to identify tectonic activity hotspots. The results indicate that the most active zones are associated with the Sabzepushan Fault, especially in the northwestern and western parts of Shiraz. The Dokuhak and Qasr-e-Ghomsheh areas exhibit the highest neotectonic index values. Additionally, half of the basins—Hezar, Bajgan, Dokuhak, Qasr-e-Ghomsheh, Akbarabad, Mishdan, Bordaj, and Qaravel—located along the region’s northeast–southeast axis show evidence of active ductile deformation, whereas the remaining basins display uplift patterns associated with brittle deformation. Evidence of both brittle (faulting, valley incision) and ductile (folding, flexural slip) deformation was documented, reflecting the complex geodynamic regime of the Zagros. The conclusions emphasize the regional geodynamic evolution and highlight practical implications for seismic hazard assessment, urban planning, and infrastructure resilience in Shiraz city.