Assessment of Risk Caused By Earthquake in Region 1 of Tehran Using the Combination of RADIUS, TOPSIS and AHP Models

Tehran, one of the important cities of Iran, is in great risk against earthquakes because several active faults are located into or around it. The significance of this metropolis from the economic and political point of view, high population and risks of possible earthquake has drawn the attention of urban managers to this problem. On this basis, to confront the probable risks and reduce the negative effects of this phenomenon, it is indispensible and of important objectives of Tehran urban management to investigate the seismic vulnerability of the city. With respect to this important issue, region 1 of Tehran municipality was selected as the study area because of its proximity to the active faults at north of Tehran. The study method and the analysis of the gathered data were performed using the methods based on information database, RADIUS, TOPSIS and AHP models, and the software based on the Geographical Information System. Variables such as the buildings location in proportion to faults, type of materials, oldness of the buildings, number of floors, population density, soil type, slope of the region, and pathway network were used for the research and the region vulnerability using 3 probable earthquake scenarios were investigated. Results indicated that region 1 of Tehran municipality is vulnerable against earthquakes.