evaluation of physical vulnerability in district one of tehran city against a possible earthquake using "ihwp" method and "gis" system

confront to natural disasters and its managing by using of the most efficient means have always been subjected to deliberation, investigation and examine from various aspect. but all the time; a comprehensive and locative analysis on the spur of the moment and place is essential act that must be taken to do.in this field geographic information system is capable through integrating information in providing a comprehensive analysis and identification of the zones which requires attention and been very effective. among natural disasters earthquake is very unpleasant and leaves the highest mortality rates, hence its management is very important especially in the context of urban. most injuries from the earthquake due to the physical resistance of tissue, the impossibility of relief and in capability of reversibility had been in direct or indirect connection with undesired structural situation this paper tries to offer the most effective strategies to achieve a higher quality of physical safety against potential earthquakes through assessment of physical vulnerability and determine vulnerable zone. materials & methods: using the five indicators (population density, land use risks, quality of buildings, life of building,  access to help and rescue center) information layers of  each of these variables was produced and the mentioned layers integrated enjoying the analytic hierarchy process ihwp in arc gis environment and location of restrict one was evaluated  against earthquake. results & discussion: physical texture of restrict one in tehran against possible earthquakes is relatively safe, there are zones 9 and 7 and 5 is very safe, zone 4, 6 and 10 secured zone 2 and 8 safety average, areas 1 and 3 are from areas were assessed with low immunity and are subject to the disaster and generally northern, passageways and narrow streets with high-rise buildings, old textures and ruined places are insecure and vulnerable parts of the region against the earthquake. conclusion: based on urban management principles now non-normative density vending by municipality of tehran in this area and growing trend of population are the main problems and a serious alarm threat to the life of the region. suggestion: due to the special position and placement in a district of northern tehran. in connection with crises such as earthquakes, management measures for preventing and comprehensive understanding of the situation in the earthquake disaster area can have a tremendous impact on reducing potential losses. in other words, it can be said that in order to achieve optimal and efficient management in the crisis requires a comprehensive crisis plan for each metropolitan area it claims that the most important part of locating and identifying hot spots form.