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<p>This study reports for the first time, a large-scale submarine landslide complex off Quilon, collectively named the Quilon Slide Complex (QSC), located on the Southwestern Continental Margin of India southwestern continental margin of India (SWCMI). Using high-resolution multibeam bathymetry and sub-bottom profiler data, we mapped the entire QSC slope along a 140&#xa0;km stretch. Bathymetric analysis identifies slide scars up to 40&#xa0;km wide with associated run-out deposits extending over 65&#xa0;km. Sub-bottom profiler data indicate a diverse range of mass transport deposits covering an area of 4,400&#xa0;km², ranging from large to smaller blocky deposits within the basin. A total of three submarine landslides (S1, S2 and S3) discernible in the QSC, occur along a prominent crack system in the upper slope region. Our investigation suggests that these cracks, extending over a 60&#xa0;km stretch between the Alleppey Terrace in the north and the Trivandrum Terrace in the south, may serve as precursors to submarine landslides. We propose that sedimentation on steeply dipping slopes along fault-controlled weak zones, combined with factors such as sea-level fluctuations, bottom-current erosion, and slope angle variability, acted as the primary preconditioning and triggering factors, collectively contributing to the complex failure episodes observed in Slides S1, S2, and S3. This study provides valuable insights for modeling the propagation of large-scale submarine landslides in continental margins.</p>

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Morphology, distribution and origin of submarine landslides in the Southwestern continental margin of India

  • 期刊论文

  • 发表日期：

    2025年12月27日

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  • S. Susanth,
  • C.M. Bijesh,
  • S. Vadakkepuliyambatta,
  • P. John Kurian

摘要

This study reports for the first time, a large-scale submarine landslide complex off Quilon, collectively named the Quilon Slide Complex (QSC), located on the Southwestern Continental Margin of India southwestern continental margin of India (SWCMI). Using high-resolution multibeam bathymetry and sub-bottom profiler data, we mapped the entire QSC slope along a 140 km stretch. Bathymetric analysis identifies slide scars up to 40 km wide with associated run-out deposits extending over 65 km. Sub-bottom profiler data indicate a diverse range of mass transport deposits covering an area of 4,400 km², ranging from large to smaller blocky deposits within the basin. A total of three submarine landslides (S1, S2 and S3) discernible in the QSC, occur along a prominent crack system in the upper slope region. Our investigation suggests that these cracks, extending over a 60 km stretch between the Alleppey Terrace in the north and the Trivandrum Terrace in the south, may serve as precursors to submarine landslides. We propose that sedimentation on steeply dipping slopes along fault-controlled weak zones, combined with factors such as sea-level fluctuations, bottom-current erosion, and slope angle variability, acted as the primary preconditioning and triggering factors, collectively contributing to the complex failure episodes observed in Slides S1, S2, and S3. This study provides valuable insights for modeling the propagation of large-scale submarine landslides in continental margins.