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<p>The north–south trending Andaman and Nicobar outer arc ridge comprises an accretionary wedge and intensely deformed tectonostratigraphic units of the Burma-Java subduction zone. The geology and geomorphological settings of the region testify to the active crustal deformation and are inherently vulnerable to differential landslides due to both natural and anthropogenic causes. The region receives over 300&#xa0;cm of rainfall annually due to both the Southwest and Northeast monsoons, while frequent atmospheric disturbances and tropical cyclones further elevate the risk of differential landslides. In this study, a landslide risk analysis was conducted to create a landslide susceptibility zonation (LSZ) map, identifying active landslide zones in South Andaman. The susceptibility zones were delineated using Remote Sensing and GIS techniques, considering various underlying factors such as geological, topographical, structural, hydrological, and anthropogenic activities. Based on this analysis, landslide susceptibility maps were developed that are divided into three main zones from high to low zones. The study indicates that ward numbers 9, 11, 17, 18, along with Austinabad and Mannarghat, are highly prone to landslides, with susceptibility rates of 10.37%, 32.77%, 27.29%, 34.23%, 32.77%, and 14.92%, respectively. Additionally, the study highlights that rainfall is the primary trigger, which, when it surpasses 550&#xa0;mm in the region, the majority of the landslides tend to occur. Moreover, activities like slope cutting and extensive construction further exacerbate the risk.</p>

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Landslide susceptibility zonation (LSZ) in parts of South Andaman Island, India using Multi-Criteria Analysis

  • 期刊论文

  • 发表日期：

    2025年11月28日

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  • S. K. Maniruzzaman,
  • S. Balaji,
  • Gulam Rasool Bhat,
  • Danish Shabir

摘要

The north–south trending Andaman and Nicobar outer arc ridge comprises an accretionary wedge and intensely deformed tectonostratigraphic units of the Burma-Java subduction zone. The geology and geomorphological settings of the region testify to the active crustal deformation and are inherently vulnerable to differential landslides due to both natural and anthropogenic causes. The region receives over 300 cm of rainfall annually due to both the Southwest and Northeast monsoons, while frequent atmospheric disturbances and tropical cyclones further elevate the risk of differential landslides. In this study, a landslide risk analysis was conducted to create a landslide susceptibility zonation (LSZ) map, identifying active landslide zones in South Andaman. The susceptibility zones were delineated using Remote Sensing and GIS techniques, considering various underlying factors such as geological, topographical, structural, hydrological, and anthropogenic activities. Based on this analysis, landslide susceptibility maps were developed that are divided into three main zones from high to low zones. The study indicates that ward numbers 9, 11, 17, 18, along with Austinabad and Mannarghat, are highly prone to landslides, with susceptibility rates of 10.37%, 32.77%, 27.29%, 34.23%, 32.77%, and 14.92%, respectively. Additionally, the study highlights that rainfall is the primary trigger, which, when it surpasses 550 mm in the region, the majority of the landslides tend to occur. Moreover, activities like slope cutting and extensive construction further exacerbate the risk.