Monitoring of tectonics movements of Gediz fault with gnss observations

Western Anatolia has been affected by many severe earthquakes from past to present. These severe earthquakes have occurred intensively around Büyük Menderes, Gediz and Denizli / Pamukkale grabens. In order to reduce or minimize the negative effects of earthquakes, it is necessary to examine the plate movements causing earthquakes. Sarıgöl and Alaşehir district centers in Manisa province are ones of the regions with earthquake risks. To date, no detailed geodetic studies have been conducted in the eastern part of the Gediz Graben. The region under the effect of deformation as a result of tectonic movements in the study area was followed by using the GNSS data of previous years and two years (in 2017 and 2018). GAMIT/GLOBK software was used to evaluate GNSS measurements. The horizontal velocity components obtained from the GNSS results were calculated between 18 mm/yr and 29 mm/yr, and the vertical velocities components were calculated between -15 mm / year and -108 mm/year. As a result of the evaluation of GNSS data, suitable results were obtained for the region tectonics. Strain analysis showed that G-K regime was dominant in the region. When the Geodetic Earthquake Repetition Maps obtained from the strain analysis results were examined, the repetition period of earthquakes greater than 6 was calculated between 39-100 years.