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The main issue in determining  seismic vulnerability is having acomprehensive view of all probable damages related to earthquake occurrence.Therefore, taking into account factors such as peak ground acceleration at the timeof earthquake occurrence, the type of structures, population distributionamong different age groups, level of education and the physical distance tohospitals (or medical care centers) and categorizing them intofour indicators of geotechnical, structural, social and physical distance toneeded facilities and  from dangerous ones will provide us with abetter and more exact outcome. To this end, this paper uses the analytichierarchy process to study the importance of criteria oralternatives and uses the geographical information system to studythe vulnerability of Tehran to an earthquake. This study focuses on the fact that Tehran is surrounded by threeactive and major faults: Mosha, North Tehran and Rey. In order tocomprehensively determine the vulnerability, three scenarios are developed.In each scenario, seismic vulnerability of different areas in Tehran  isanalyzed and classified into four levels: high, medium, low andsafe. The results show that, regarding seismic vulnerability, the faults ofMosha, North Tehran and Rey make, respectively, 6, 16 and 10% of Tehranhighly vulnerable, while 34, 14 and 27% is safe

natural hazards and earth system sciences

GIS modeling of seismic vulnerability of residential fabrics considering geotechnical, structural, social and physical distance indicators in Tehran using multi-criteria decision-making techniques