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  • Küçük Resim
    Öğe
    Kuzey Anadolu fayı Bolu-Çorum segmenti boyunca yer kabuğu hareketlerinin GNSS yöntemiyle izlenmesi
    (Afyon Kocatepe Üniversitesi, 2017) Aladoğan, Kayhan; Tiryakioğlu, İbrahim; Yavaşoğlu, Hasan Hakan; Alkan, Reha Metin; Alkan, Mehmet Nurullah; Köse, Zafer; İlçi, Veli; Ozulu, İbrahim Murat; Tombuş, Fazlı Engin; Şahin, Murat
    Dünyada deprem oluşturan pek çok aktif fay bulunmaktadır. Bu faylardan birisi olan Kuzey Anadolu Fay Zonu (KAFZ) son yüzyılda yıkıcı depremler oluşturmuş, meydana gelen bu depremler ise büyük can ve mal kayıplarına neden olmuştur. Gerçekleşen bu depremler ile kırılmayan fayın oluşturabileceği depremin konumunu, büyüklüğünü ve zamanını tespit edebilmek için farklı yöntemler kullanılarak çalışmalar yapılmaktadır. Bu yöntemlerden birisi de GNSS gözlemleri sonucu hız alanı oluşturmaktır. Yapılan çalışmalar sonucunda Avrasya Plakası sabit alınması ile Anadolu Levhasının KAFZ boyunca, saatin dönme hareketinin tersine olan hızı tespit edilmiştir. Elde edilen GNSS sonuçları ile KAFZ'ın orta kısmının sıkışmalı bir yapıya sahip olduğu anlaşılmaktadır. Faya paralel hareketin miktarı bölgede küçük bir jeodezik ağa ait noktalardan tespit edilirken, faya dik yönde sıkışma bileşeninin miktarı hakkında detaylı bir çalışma yapılmamıştır. Bu çalışmada KAFZ üzerinde Bolu-Çorum segmentinde, toplam 22 nokta üzerinde 5 profil oluşturacak şekilde geniş bir GNSS ağı kurularak kayma oranının belirlenmesi amaçlanmıştır. Jeodezik ağ üzerinde 2014, 2015 ve 2016 yılları 3 kampanya GNSS ölçüsü yapılmış ve güncel hız alanı hesaplanmıştır
  • Küçük Resim
    Öğe
    Monitoring the deformation and strain analysis on the Ataturk Dam, Turkey
    (Taylor and Francis Ltd., 2018) Yavaşoğlu, Hasan Hakan; Kalkan, Yunus; Tiryakioğlu, İbrahim; Yiğit, Cemal Özer; Özbey, Volkan; Alkan, Mehmet Nurullah; Bilgi, Serdar; Alkan, Reha Metin
    Every man-made structure creates certain risks – dams are no exception. Most failures in man-made structures that have occurred could have been avoided if the structures’ behaviour had been inspected, monitored, and analyzed continuously, and if proper corrective measures had been taken in a timely fashion. The DSI (The General Directorate of State Hydraulic Works), which is the institution responsible for dam safety, has long used surveying methods to measure the displacements of geodetic points as a part of dam monitoring policy. In this study, we focus on the dam’s mechanical behaviour throughout a time period of more than 10 years. These study results have been derived from a separate, ongoing project that has monitored deformation on the Ataturk Dam and is now determining the water level of the reservoir. The project results show that although the dam body has become more stable and the water load behind the dam has increased, the rate of displacement of the dam has declined significantly. From these results, it can be seen that the reservoir water level can be increased evenly over time and that 542 m is the maximum water level of the dam’s reservoir. © 2017 The Author(s).
  • [ X ]
    Öğe
    The determination of interseismic, coseismic and postseismic deformations caused by the Gökçeada-Samothraki earthquake (2014, Mw: 6.9) based on GNSS data
    (Elsevier Ltd, 2017) Tiryakioğlu, İbrahim; Yiğit, Cemal Özer; Yavaşoğlu, Hasan Hakan; Saka, Mehmet Halis; Alkan, Reha Metin
    Since the 1990s, seismic deformations have been commonly determined using the Global Navigation Satellite System (GNSS). Recently, the GNSS systems have become even more powerful with the use of new technologies in innovative studies. In this study, the GNSS data was used to investigate interseismic, coseismic and postseismic deformation and velocity of the Gökçeada-Samothraki earthquake (Mw = 6.9) that occurred on May 24, 2014. The data was obtained at 30 s (0.033 Hz) and 1 s (1 Hz) intervals from the GNSS receivers in the network of Continuously Operating Reference Stations, Turkey (CORS-TR). For the interseismic period, the daily coordinate time series of 12 stations located within 90–250 km of the earthquake epicenter was evaluated for the displacement of stations over a period of approximately 2000 days prior to the day of the earthquakes, from October 1, 2008 to May 23, 2014. In order to analyze the ground motion displacement during the Gökçeada-Samothraki earthquake, 1 Hz data from 8 continuous GNSS stations was processed using precise point positioning (PPP) and relative positioning methods to estimate the epoch-by-epoch positions of the stations. During the earthquake, coseismic displacements of approximately 7 and 30 mm were detected in the NW direction at the YENC and CANA stations, respectively. However, at the IPSA station, a coseismic deformation of 20 mm was observed in the NE direction. There were no significant changes at the other stations during the earthquake. For the postseismic period, the daily coordinate time series of the 12 stations were evaluated for station displacements for 570 days after the day of the earthquakes, from May 24, 2014 to January 1, 2016. The results demonstrated that no significant postseismic deformation with the exception of the EDIR station. An abnormal deformation caused by local factors was determined at the EDIR station. In this study, the PPP and the relative solution were also compared in terms of capturing the earthquake wave motion. The results demonstrated that the PPP-based solutions showed good agreement with those of relative positioning in terms of the ability to capture coseismic displacement. © 2017 Elsevier Ltd