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INVESTIGATION ON THE KINEMATIC STRUCTURE OF TUZLA FAULT ZONE WITH NEW GPS AND MICROGRAVITY DATA IN IZMIR - TURKEY
Abstract
Western Anatolia in Turkey is one of the areas in which the earth`s continental crust has been rapidly deformed. The dominant system is a graben system in western part of the Anatolia. There are various suggestions about the type of the deformation, the amount of extension and the formation of grabens. The regional tectonic structures of western Anatolia is characterized by strike-slip and normal fault zones. Tuzla fault zone, in Izmir in Western Anatolia, is one of the most important of them. The seismic activity of this zone poses a significant risk for Izmir (Turkey) and the surrounding area. For this reason, in this study, the fault mechanism was examined with GPS data to define the kinematic structure in space and time for Tuzla fault zone. In order to determine the fault mechanism of Tuzla Fault zone, a study has been established under the scope of the Scientific and Technological Council of Turkey (TUBITAK Project Nr. 108Y285) Project. Within the scope of this study, two GPS campaigns were carried out in Izmir and the surrounding region in 2009 and 2010. The da ily observation period for each site was about ten hours and observations were performed as two different sessions at 9 stations. Observations in each session lasted 3 days. The sampling rate for the data collection was 30 seconds and the data were collected with a minimum elevation angle of 10 degrees. During the campaigns, Trimble RTK 4000 and 5700 receivers and Zephyr Geodetic antennas were used. GPS observations were processed using GAMIT/GLOBK software. GPS derived results were compared to microgravity data. The aim of the st udy is to determine the displacements of the fault blocks. Displacements of East and West blocks of the Tuzla Fault were obtained relative to each other. These fault blocks’ displacements were also obtained relative to Eurasia by using 12 IGS stations.
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