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<p>Landslides are a major threat to human safety and infrastructure, particularly in hilly basaltic terrain of the Deccan Traps. The Raigad district in Maharashtra, India has faced recurrent landslides during the monsoon season resulting in considerable loss of life and property since 2005. The Taliye landslide near Mahad town occurred on 22 July 2021 in the weathered basalt area of the Deccan Traps, causing the death of about 90 people. This highlights an urgent need for detailed investigations of the surface and subsurface features of landslide-prone regions to reduce future risks in the area. The present research adopts a comprehensive method that integrates field surveys, slope stability analysis, Electrical Resistivity Tomography (ERT) and flow modeling to investigate both surface and subsurface properties as well as flow dynamics of the Taliye landslide. Findings from ERT highlighted significant subsurface characteristics such as a thick layer of soil overburden and areas with highly weathered basalt which significantly influenced the slope’s instability. Further, analysis of slope stability and flow modeling demonstrated that elevated pore-water pressure, weathered materials and steep slopes were crucial factors leading to slope failure. The present research shows important insights into landslide processes in the basaltic terrain of the Deccan Traps, highlighting the critical role of subsurface features in assessing landslide hazards.</p>

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Analysis of landslide process in parts of basaltic terrain in Western Ghats, India using remote sensing, electrical resistivity tomography and flow modeling

  • 期刊论文

  • 发表日期：

    2026年8月3日

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  • Nirmala Jain,
  • Raghunath Dass,
  • Pamir Roy,
  • Tapas Ranjan Martha,
  • Iswar Chandra Das,
  • G. Srinivasa Rao,
  • Prakash Chauhan

摘要

Landslides are a major threat to human safety and infrastructure, particularly in hilly basaltic terrain of the Deccan Traps. The Raigad district in Maharashtra, India has faced recurrent landslides during the monsoon season resulting in considerable loss of life and property since 2005. The Taliye landslide near Mahad town occurred on 22 July 2021 in the weathered basalt area of the Deccan Traps, causing the death of about 90 people. This highlights an urgent need for detailed investigations of the surface and subsurface features of landslide-prone regions to reduce future risks in the area. The present research adopts a comprehensive method that integrates field surveys, slope stability analysis, Electrical Resistivity Tomography (ERT) and flow modeling to investigate both surface and subsurface properties as well as flow dynamics of the Taliye landslide. Findings from ERT highlighted significant subsurface characteristics such as a thick layer of soil overburden and areas with highly weathered basalt which significantly influenced the slope’s instability. Further, analysis of slope stability and flow modeling demonstrated that elevated pore-water pressure, weathered materials and steep slopes were crucial factors leading to slope failure. The present research shows important insights into landslide processes in the basaltic terrain of the Deccan Traps, highlighting the critical role of subsurface features in assessing landslide hazards.