Earthquake Vulnerability Assessment of Guwahati Urban Centre

Abstract eng:
Urban seismic risk in Guwahati is increasing with population growth and the encroachment of vulnerable built-in environment into areas susceptible to seismic hazard. The city lies in zone V and is the gateway to seven north-eastern states of India. Under the initiative of the Department of Science & Technology an effort has been made to enhance the understanding of the vulnerability of the built-up environment of the Guwahati city and generate seismic risk map on the Geographical Information System (GIS), based on hazards evaluated through an already accomplished seismic microzonation mapping. An inventory of building data has been created to facilitate risk mapping by appropriate indexing of the risk involved due to potential hazard to the existing buildings/structures. The current building map of Guwahati has been completed on GIS with 85,000 building footprints covering the entire Guwahati Metropolitan Area. The building map has been prepared using both field survey and satellite imagery. The vulnerability of existing building stock in the Guwahati Metropolitan area have been studied both qualitatively and quantitatively. The Rapid Visual Screening (RVS) procedure has been adopted for qualitative vulnerability assessment of the structures and first level vulnerability analysis has been completed based on building typology and survey data. The first level seismic risk map has been prepared by overlaying the building inventory data on the final seismic hazard map considering the weighted contribution of all existing hazards as evaluated from the microzonation study. An attempt has been made to identify buildings susceptible to landslide hazard and hazard due to potential liquefiable area.

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