Abstract: It`s very difficult to estimate earhquake hazards. However, we estimate earthquake hazards by using computer technology especially Geographic Information System (GIS) and we evaluate hazard studies which has been carried out by researchers on 22 July 1967 at Mudurnu valley earthquake. In this study, we use database about geological information. We assumed some parameters according to geological database and we put Risk value to database. After that, we determined potential risk area that has occurred hazards by using overlay analysis. Finally the result of this study correlate with the result of earlier hazard investigation.From this correlation, we obtained % 65 precise result by using GIS. To obtain more precise result, we should have considered increasing database quality.