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<p>Karst landscapes are highly sensitive to changes in climate and groundwater conditions, and recent reductions in rainfall and groundwater levels have increased the risk of surface deformation in many areas. This study focuses on the Derak region of Shiraz City, Iran, to evaluate how tectonic structures influence karst development and the potential for sinkhole formation. To investigate this, geophysical surveys were deployed using Vertical Electrical Sounding (VES) to detect subsurface fractures and faults that may control karst processes. Fracture data were analyzed using the Box Counting method to determine fracture density and distribution patterns. A geoelectrical instrument was used to perform resistivity measurements, and IPI2WIN software was employed to model subsurface resistivity layers. The resulting pseudo-sections and resistivity profiles were interpreted to identify zones of increased fracturing and possible karst activity. Results indicate that high fault density and frequent minor fractures, synergistically promote karstification through enhanced secondary porosity and permeability and increasing the likelihood of sinkhole occurrence.</p>

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Determining the role of tectonics in developing the phenomenon of karst in Shiraz’s Derak region

  • 期刊论文

  • 发表日期：

    2026年7月6日

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  • Saeid Eskandari,
  • Abdul-Majid Asadi,
  • Kouros Yazdjerdi

摘要

Karst landscapes are highly sensitive to changes in climate and groundwater conditions, and recent reductions in rainfall and groundwater levels have increased the risk of surface deformation in many areas. This study focuses on the Derak region of Shiraz City, Iran, to evaluate how tectonic structures influence karst development and the potential for sinkhole formation. To investigate this, geophysical surveys were deployed using Vertical Electrical Sounding (VES) to detect subsurface fractures and faults that may control karst processes. Fracture data were analyzed using the Box Counting method to determine fracture density and distribution patterns. A geoelectrical instrument was used to perform resistivity measurements, and IPI2WIN software was employed to model subsurface resistivity layers. The resulting pseudo-sections and resistivity profiles were interpreted to identify zones of increased fracturing and possible karst activity. Results indicate that high fault density and frequent minor fractures, synergistically promote karstification through enhanced secondary porosity and permeability and increasing the likelihood of sinkhole occurrence.