Landslide Susceptibility Zonation of Kolasib District, Mizoram, India Using Remote Sensing And GIS Techniques.

Fragile geologic conditions and rugged topography are the main causes of recurring landslide in Mizoram. The present study investigates the Landslide Susceptibility Zones of Kolasib district using Remote Sensing and Geographic Information System (GIS) techniques. Landslide inducing factors within the district were identi?ed and accordingly, five thematic layers viz., slope morphometry, geological structures like faults and lineaments, lithology, relative relief and land use / land cover were generated. These thematic layers were ranked and weighted based on their relative importance in causing landslide. Each class within a thematic layer was assigned an ordinal rating from 1 to 10 as attribute information in the GIS environment. These attribute values were then multiplied by the corresponding rank values to yield the different zones of landslide susceptibility. The ground information on landslide occurences were also considered while classifying the landslide susceptibility zones. The resulting Landslide Susceptibility Zonation map classified the area into five relative susceptibility classes like very high, high, moderate, low, and very low. The final map generated will, therefore, be used by planners and administrators in selecting suitable areas for developments and for implementing appropriate mitigation measures in the landslide prone areas.