Abstract
Sikkim State in the eastern Indian Himalayan Region experiences intensive landslides because of its geologically brittle terrain coupled with heavy rainfall and anthropogenic influences. Based on satellite images and a toposheet from the Survey of India, a total of 50 landslides were identified in a study area of 133.8 km2. Among them, 43 were validated in field survey. The important factors for landslide hazard are identified and thematic maps are prepared in ArcGIS. Impacting factors including geomorphologic properties, drainage and soil conditions are assigned weight factors according to our work knowledge in this region to generate thematic layers in ArcGIS for landslide hazard analysis. A landslide hazard zonation map containing five classes, ranging from very low hazard to very high hazard, is produced. The results provide a reliable database for disaster detection and post disaster management, which is essential to planning developmental activities in this district.
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