The Inonu-Eskisehir Fault System (IEFS) is a NW- to WNW-trending zone of active deformation about 15-25 km wide, 400 km long and characterized predominatly by strike-slip faulting. In this study, the Yorukkaracaoren (SE of Eskisehir)-Sivrihisar section of the IEFS was investigated. The system consists of three fault zones, namely the Alpu Fault Zone (AFZ), the Eskisehir Fault Zone (EFZ) and the Orhaniye Fault Zone (OFZ) in the study area. The EFZ is made up mostly of N30 degrees W-trending right-lateral strike-slip fault segments with normal components. However, the AFZ and OFZ are composed of E-W-trending normal and NE- to NW-trending strike-slip fault segments.