Abstract
AbstractLandslides and other mass movements are serious geo-environmental hazards in the Greater Gangtok region. It is intensified manifolded by human interferences in terrain. Massive landslides kill thousands of people with catastrophic damages in this region. Therefore, in the present study, a methodology for landslide susceptibility mapping has been developed through an integrated GIS technique. Thus, four major causative factors, i.e. morphometric, geological, environmental and triggering for landslides, have been prepared on the GIS platform. A frequency ratio technique has been used for landslide susceptibility zonation mapping. Thereafter, the entire Sikkim Himalaya has been categorized into five landslide susceptible classes, viz. low, moderate, high, very high and severe. The susceptibility map has been validated by correlating with the landslide inventory, and it is found that more than 80% of the landslide has occurred in the severe to high susceptibility zone. Also, it is observed that the major urban clusters like Chandmari, Bhurtuk, Tadong and the northwestern part of the terrain are most vulnerable to the landslide.KeywordsLandslide Susceptibility ZonesGreater GangtokLandslide Inventory
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