In Turkey, especially after the 1999 Marmara earthquake and recently the 2011 Van earthquake have shown that if necessary measures are not taken, disasters such as earthquakes are highly destructive for human life. Therefore, studies related with risk reduction before disasters happen are quite significant. Risk reduction should be insured by considering the risk factors before disasters happen. Within risk reduction, casualties, which may occur after the disasters, would be decreased to minimum levels. In this context, risk determination, which is the primary stage of the risk reduction process, is assessed for the case study of Yalova city center. Geological, infrastructural and superstructural characteristics of the case area are considered for the purpose of creating a relative synthesis risk map. A synthesis map is attained via integration of the analytical hierarchy process (AHP) and TOPSIS methods, which are included in multi criteria decision methods (MCDM), with geographical information systems (GIS). According to the obtained synthesis map, the structures, which have the characteristics of attached buildings, older years of built and low levels of quality, and belonging to the historical city center are determined as most risky. Risk reduction could be achieved by considering various urban transformation methods and may be handled in the following stages of this study.