Abstract: In Southwestern Turkey and adjacent areas, technical development is subdivided in three periods,namely Paleotectonic period, Transition period and Neotectonic period- The Transition period is characterized bya thick pile of molasse formations as in many parts of the Alpine orogenic belt. On the other hand, the Neotectonic period, which initiated locally at the end of Middle Oligocene time but regionally in Late Miocene to EarlyPliocene, is characterized by continental sedimentation, synsedimentary volcanism and the block-faulting developed under the control of tensional tectonic regime. The geologic events and the features representing the Neotectonic period in Southwestern Turkey and adjacent areas are a result of the tensional tectonic regime due to theAegean trench rather than the North Anatolian Fault- Because the region has been divided in many aseismicand seismic blocks bounded by the oblique type of normal faults.