Determination of the Recent Tectonic Movements Using GPS and Insar Methods The First Results From the Eastern Part of the Gediz Graben

English (OpenAlex)

The Western Anatolia where many civilizations were developed in has been affected by significant number of destructive earthquakes throughout history. The existence of about 13 earthquakes that occurred in the historical period in the zone encompassing the study area has been recorded. The majority of these historical earthquakes are concentrated around the Gediz Graben. When the historical earthquake activities of Gediz Graben is analyzed, the earthquakes with magnitude bigger than VII are recorded as follows; the ones located in the western end of the Graben occurred in the years of B.C. 17 and A.D. 1592, 1850, 1862 while the ones located in the eastern end of the Graben in the years of A.D. 60 and 494. In addition to the ones mentioned above, the Alasehir earthquake with the magnitude M=6.5 occurred on March 28, 1969 in the eastern end of the Graben. This earthquake is considered to be formed along the southern main boundary fault of the Graben [1]. Within the study, two different spatial geodetic technologies, SAR (Synthetic Aperture Radar) interferometry and GPS (Global Positioning System), will be used. Both methods are increasingly and widely used for determining and monitoring local deformations. The results that are obtained with the usage of both methods have significant advantages over each other. While the point based measurements on the cm-level with GPS are able to provide high precision for the horizontal component of terrestrial deformations (vertical error is about twice bigger than the horizontal errors), the spatial measurements on the cm-level with InSAR is effective to determine displacements in the vertical direction. In this study, it has been aimed to determine the spatial long-term deformations by using the superiorities of both technologies