Landslide susceptibility mapping using frequency ratio method and GIS in south eastern part of Nilgiri District, Tamilnadu, India

The study area is located in the Nilgiri district of TamilNadu, India. Most of the landslides during November, 2009 occurred between Burliyar and Katteri along the road, Nagapattinam Gudalur National Highway (NH67). More than 80 major landslides were reported within three days from 8 to 10 November, 2009, which took 48 human lives, and also imparted severe damage to houses, roads and railway lines. Detailed investigation was carried out on the landslide that occurred during the month of November, 2009 in Nilgiri District. The investigation involved systematic collection of data pertaining to the geological, structural and geomorphic variables. The Landslide Susceptibility Index map was prepared using GIS and it divides the study area into five zones of landslide susceptibility viz., very low, low, moderate, high and very high.