ABSTRACT: The purpose of this investigation is to explain some neotectonic and paleoseismolojicalfeatures of Fethiye-Burdur Fault zone that is located in SW- Turkey between gulf of Fethiye andBurdur Lake. This zone, which is about 300 km. in length, is characterized as a combination of anumber of normal faults which has generally left lateral oblique-slip in feature. It is, also,charecterized as beeing the most active fault system in Southwest Anotolia. Burdur fault zone,normally, extends in NE-SW direction, but it was segmented in various lengths by several faultstilted in NW direction. Burdur and Tefenni segments, that are 60-70 km. in length, are considered asthe most active lines of these segments. It has been reported that two major earthquakes in 1914 and1971 took place on these segments with a magnitude of 7.1 and 6.2, respectively.Trench studies have been conducted on Yassıgüme and Burdur locations to investigatedeformations caused by the vertical displacements following the 1914 and 1971 earthquakes. TheBurdur fault in theYassıgüme location is characterized as a single line fault structure in the field. Itsvisible fault plane clearly reflects the left lateral oblique – slip moving and related sliding lines. As aresult of the trench study performed on this segment a vertical displacement of 70 cm. in length hasbeen identified as belong the 1971 earthquake.On the other hand, Burdur segment, which is one of the most important branch of Burdur faultzone, consists of four different stepwise oblique fault systems within the south of Burdur Lake whichextends in NE direction. These fault systems pass through the city center of Burdur and caused thestepwise topographical features. The unconsolidated sediments within the trench section consistsdominantly of cross-bedded sands, mudstones and present slope-debris deposits. Also, fault planeand kolluvial sediments with muddy dike structures were found as most important structuralconstituents in the trenches. These structures are thought to be developed as a result of 1914earthquake. Several faults located on the hills show vertical displacements of 90-250 cm. Thesefaults are seen in discordant with the colluvial developments. Thus, the youngest faults located in thetrenches and hills can be considered having the highest vertical displacements. Observations ofsome folds and local discontinuties can be considered as typical in this type of settings.Two recent earthquekes, which took place in 3 and 5 April, 2002 with a magnitude of 3,9 and4,0 respectively, can be considered significant since they highlight the exsistence of sismic activityon this segment. Futhermore, they help us to prove that this segment can be identified as obliquelyleft tilted normal fault