The observation of surface ruptures along the northern flank of the Büyük Menderes Graben was difficult and very limited in terms of visibility, mostly because of erosion, sedimentation, and human activity. To complement field observations of fault scarps, we performed GPR prospecting in areas where the main fault segment is buried and no visual account of the precise location of the fault is available. Field observations alone would not be capable of recognizing these fault traces.