Monitoring of Deformations Along Fethiye-Burdur Fault Zone (Turkey) with GPS

Afyonkarahisar, Burdur and Fethiye region, southwest of Turkey is located on a tectonically active area. According to the historical recordings, the region was destructed by earthquakes many times. Since the beginning of the 20^th century, more than 35 earthquakes with magnitudes bigger than 4 occurred in Afyonkarahisar region. Seven earthquakes recorded over the last 90 years in the region between Burdur and Fethiye whose magnitudes are between 5.0 and 7.0. This new project "Monitoring of Deformations Along Fethiye-Burdur Fault Zone With GPS", is founded by The Scientific and Technical Research Council of Turkey (TUBITAK), Istanbul Technical University (ITU), Karadeniz Technical University (KTU) and Afyon Kocatepe University (AKU). The aim of the project is to determine strain accumulation of the study area. To determine tectonic characteristic of the region, a network having ten sites is established. First and second campaigns were carried out with in August 2003 and March 2004. The duration of measurements in each day was about 12 hours. After first two periods, our network is extended with six new points. Then, the third campaign was performed with 16 sites at two stages in 6 days. In this period the duration of measurements in each day was about 8 hours. The GPS measurements for three campaigns are processed by using GAMIT/GLOBK software package. This paper examines the results from the three GPS campaigns. The velocity vectors between the SRKK and SLVR points show an opening which is caused by the activeness of the movements between the area of Çay Tatarlý in the South of Sultandaǧi{dotless} fault. The GPS velocities of SLVR and ISRT points show that the horizontal velocities of the area are in the same direction showing that there isn't active movement in this area. The velocity vectors of GKPN and KYBS stations are interpreted that constriction is dominant in the area and it is because of the left lateral oblique faults in the region. Examining SIRA and KZLR stations confirm that the area is active and that there are left lateral faults in the region.