Current Tectonic Movements Monitoring in Aksehir-Sultandagi Fault Zone After the February 2002 (Mw: 6.2) Earthquake İbrahim Tiryakioglu, Tamer Baybura, Caglar Ozkaymak, Mustafa Yılmaz, Mehmet Ali Uğur, Cemal Özer Yiğit, Ahmet Anıl Dindar, Fatih Poyraz, Engin Gulal, Hasan Sözbilir, Murat Uysal, and Burak Akpınar Keywords GNSS Á GAMIT/GLOBK Á Southwestern Anatolia Á Tectonic movements 1 Introduction Aksehir-Sultandagi Fault Zone (ASFZ) is one of the most important seismogenic zones located in the expansion region of Western Anatolia. ASFZ contains a number of discrete active normal fault zones that trend Northwest-Southeast (NW-SE) and controls the current morphology. These fault zones approximately parallel to the general trend of ASFZ have caused the formation of the grabens, from Southeast to Northwest, in Afyon-Aksehir (Koçyiğit and ve Deveci 2007). The historical and instrumental earthquake records period suggests the existence of a large number of earth- quakes that created the surface ruptures in this zone. On the date of 03.02.2002, this region has been shaken by tan earthquake with Mw 6.5 and Mw 6.2 in size. The epicentres were located Bolvadin and the southern Eber Lake. In the literature, these earthquakes are considered to be part of seismic migration advancing towards north-west on the Aksehir-Sultandagi fault zone and influenced by the earth- quakes occurring in the region; staring with Doganhisar-Ilgin earthquake located on the east of the Afyon-Aksehir Graben in 1921, Argithanli earthquake in 1946, and Sultandagi earthquake in 2000 respectively (Demirtaş et al. 2002; Emre et al. 2003). Based on the possible continuation of this earthquake migration towards the west, the mapped active faults and seismic gaps existing in the region reveal the possibility of a devastating earth- quake in the near future that may occur around the province of Afyonkarahisar (Fig. 1a) (GgF: Gazlıgöl Fault; EF: Erk- men Fault; C FZ: Cobanlar Fault Zone; IsFZ: Işıklar Fault Zone; BF: Bolvadin Fault; BkF: Büyük Karabağ Fault; TF: Tatarlı Fault; SaF: Sandıklı Fault). 2 The Geo-Sensor Network and Data Analysis The main objectives of this study were to determine the recent tectonic movements with GNSS measurements and reveal the motive behind the surface deformations occurring in the region. Within this study, a GNSS network was established including the mentioned seismic gaps, earthquake migration, and surface ruptures located the ASFZ surroundings to İ. Tiryakioglu (&) Á T. Baybura Á M. Yılmaz Á M.A. Uğur Á M. Uysal Geomatics Engineering, Faculty of Engineering, Afyon Kocatepe University, 03200 Afyonkarahisar, Turkey e-mail: itiryakioglu@aku.edu.tr İ. Tiryakioglu Á C. Ozkaymak Earthquake Applied and Research Center, Afyon Kocatepe University, 03200 Afyonkarahisar, Turkey C. Ozkaymak Geological Engineering, Faculty of Engineering, Afyon Kocatepe University, 03200 Afyonkarahisar, Turkey C.Ö. Yiğit Geomatics Engineering, Faculty of Engineering, Gebze Technical University, 41400 Kocaeli, Turkey A.A. Dindar Civil Engineering, Faculty of Engineering, Gebze Technical University, 41400 Kocaeli, Turkey F. Poyraz Geomatics Engineering, Faculty of Engineering, Cumhuriyet University, 58140 Sivas, Turkey E. Gulal Á B. Akpınar Geomatics Engineering, Faculty of Civil Engineering, Yildiz Technical University, 34220 Istanbul, Turkey H. Sözbilir Geological Engineering, Faculty of Engineering, Dokuz Eylül University, 35210 İzmir, Turkey © Springer International Publishing AG 2018 A. Kallel et al. (eds.), Recent Advances in Environmental Science from the Euro-Mediterranean and Surrounding Regions, Advances in Science, Technology & Innovation, https://doi.org/10.1007/978-3-319-70548-4_548 1899