Quaternary activity of the Cihanbeyli and Yeniceoba fault zones: İnönü-Eskişehir fault system, Central Anatolia
Yıl: 2007 Cilt: 16 Sayı: 4 Sayfa Aralığı: 471 - 492 Metin Dili: Türkçe İndeks Tarihi: 29-07-2022
Quaternary activity of the Cihanbeyli and Yeniceoba fault zones: İnönü-Eskişehir fault system, Central Anatolia
Öz: Batıda (Uludağ), güneybatıda Sultanhanı arasında yer alan, gidişi KB–GD ile BKB–DGD arasında değişen bir dizi fay zonundan oluşan İnönü-Eskişehir fay sistemi (İEFS), Orta Anadolu’daki en önemli fay sistemlerinden birisidir. ‹EFS’nin en batı ucundaki kolu olan Eskişehir fay zonu İnönü ile Sivrihisar arasında BKB–DGD gidişlidir. İEFS, Sivrihisar civarında doğrultuları KB–GD olan dört fay zonuna ayrılarak Tuzgölü’nün güneyine kadar devam eder. Bunlar Ilıca, Yeniceoba, Cihanbeyli ve Sultanhanı fay zonlarıdır. Batıda Günyüzü, doğuda Yeniceoba arasında yüzeyleyen KB–GD gidişli Yeniceoba fay zonu (YFZ) Kelhasan yükselimi’nin kuzey kenarını ve Yeniceoba Ovası’nın güney kenarını kontrol eder. Fay düzlemleri üzerinde üst üste (süperimpoze) gözlenen iki fay çiziği seti daha eski sağ yanal doğrultu atımlı bir faylanmayı, ve daha genç olan sağ yanal bileşenli normal bir faylanmanın varlığına işaret eder. KB–GD gidişli Cihanbeyli fay zonu (CFZ) batıda Sülüklü kuzeyi, doğuda ise Cihanbeyli arasında çok belirgin olarak yüzeylenir. Kelhasan yükselimi’nin güney kenarını kontrol eden fay zonu, fay diklikleri, üçgen yüzeyler, alüvyon yelpazeleri ve su kaynağı dizilimleri ile karakterize olur. Pliyosen gölsel kireçtaşları ile daha genç akarsu klastikleri arasındaki fay düzlemlerinde yapılan güncel ayrıntılı saha çalışmaları ve kinematik analizler CFZ’nun birbirine paralel ve tamamen normal fay karakterli fay serilerinden oluştuğunu göstermektedir. Halbuki, CFZ’nun güneydoğu ucunda yer alan Cihanbeyli Grabeni içinde yer alan Pleyistosen–Holosen yaşlı klastikleri kesen faylardaki kayma düzlemi verileri bu fayların çok az sol yanal atım bileşenli normal faylar olduğunu göstermiştir. Tüm fay düzlemlerinin kinematik analizi ise, bölgenin tansiyonel rejimin etkisi altında olduğunu ve genişlemenin KKB–GGD doğrultusunda geliştiğini göstermiştir. YFZ ve CFZ üzerinde yer alan İlhanyayla, Damlakuyu köyü ve İnsuyu köyünün yaklaşık 4 km doğusunda yüzeyleyen, yatay konumdaki güncel taraça çökellerini kesen oldukça dik eğimli, az miktarda doğrultu atım bileşenine sahip normal faylar, Cihanbeyli ve Yeniceoba fay zonlarının her ikisinin de Kuvaterner’de aktif olduğunu ve KKD–GGB yönlü bir açılmanın etkisinde olduklarını belirtir. Aletsel dönemde meydana gelen ve deprem dışl merkezleri fay zonu üzerinde yer alan depremlerin varlığı ise, aktivitenin günümüzde de devam ettiğini kanıtlamaktadır.
Anahtar Kelime: Konular:
Cihanbeyli ve Yeniceoba fay zonları'nın kuvaterner aktivitesi: İnönü-Eskişehir fay sistemi, Orta Anadolu
Öz: The İnönü-Eskişehir fault system (İEFS) is one of the most important fault systems in Central Anatolia and consists of a series of NW–SE- to WNW–ESE-trending fault zones extending from Uludağ (Bursa) in the northwest to Sultanhanı in the southeast. Between İnönü and Sivrihisar, the Eskişehir fault zone of the İEFS trends WNW, but east of Sivrihisar the İEFS changes its direction to NW–SE and splays out into four fault zones, named the Ilıca, Yeniceoba, Cihanbeyli and Sultanhanı fault zones and extends to south of Tuzgölü in the east. The NW–SEtrending Yeniceoba fault zone (YFZ), exposed between Günyüzü in the west and Yeniceoba in the east, controls the northern margin of the Kelhasan horst and the southern margin of the Yeniceoba basin. Along this fault zone two sets of superimposed slickenlines indicate older pure right-lateral strike-slip faulting and younger normal faulting with a right-lateral component. The NW–SE-trending Cihanbeyli fault zone (CFZ) is well exposed between north of Sülüklü in the west and Cihanbeyli in the east. It controls the southern margin of the Kelhasan horst, and is marked by fault scarps, triangular facets, alluvial fans and alignment of springs. Recent detailed field mapping and kinematic analysis along the fault planes between Pliocene lacustrine carbonates and younger fluvial clastic rocks has shown that the CFZ consists of a series of parallel normal faults. However, kinematic analysis of the fault slip-plane data indicates that the fault planes cutting the Pleistocene–Holocene clastic sediments of the Cihanbeyli Graben at the southeastern tip of the CFZ are normal faults with a minor sinistral component. The kinematic analyses of fault-slip data clearly indicate that the area experienced NNE–SSW extension. Recent horizontal terrace deposits cut by a series of steeply-dipping normal faults with minor strike-slip component in İlhanyayla, Damlakuyu (Çorca) village and nearly 4 kilometres southeast of İnsuyu village, which are located on the YFZ and CFZ, indicate that the activity of both CFZ and YFZ continues, controlled by NNE–SSE-directed extension, in the Quaternary. The distribution of earthquake epicentres supports this view and suggests recent activity along the fault zones.
Anahtar Kelime: Konular:
Belge Türü: Makale Makale Türü: Araştırma Makalesi Erişim Türü: Erişime Açık
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APA | Özsayin E, DİRİK K (2007). Quaternary activity of the Cihanbeyli and Yeniceoba fault zones: İnönü-Eskişehir fault system, Central Anatolia. , 471 - 492. |
Chicago | Özsayin Erman,DİRİK Kadir Quaternary activity of the Cihanbeyli and Yeniceoba fault zones: İnönü-Eskişehir fault system, Central Anatolia. (2007): 471 - 492. |
MLA | Özsayin Erman,DİRİK Kadir Quaternary activity of the Cihanbeyli and Yeniceoba fault zones: İnönü-Eskişehir fault system, Central Anatolia. , 2007, ss.471 - 492. |
AMA | Özsayin E,DİRİK K Quaternary activity of the Cihanbeyli and Yeniceoba fault zones: İnönü-Eskişehir fault system, Central Anatolia. . 2007; 471 - 492. |
Vancouver | Özsayin E,DİRİK K Quaternary activity of the Cihanbeyli and Yeniceoba fault zones: İnönü-Eskişehir fault system, Central Anatolia. . 2007; 471 - 492. |
IEEE | Özsayin E,DİRİK K "Quaternary activity of the Cihanbeyli and Yeniceoba fault zones: İnönü-Eskişehir fault system, Central Anatolia." , ss.471 - 492, 2007. |
ISNAD | Özsayin, Erman - DİRİK, Kadir. "Quaternary activity of the Cihanbeyli and Yeniceoba fault zones: İnönü-Eskişehir fault system, Central Anatolia". (2007), 471-492. |
APA | Özsayin E, DİRİK K (2007). Quaternary activity of the Cihanbeyli and Yeniceoba fault zones: İnönü-Eskişehir fault system, Central Anatolia. Turkish Journal of Earth Sciences, 16(4), 471 - 492. |
Chicago | Özsayin Erman,DİRİK Kadir Quaternary activity of the Cihanbeyli and Yeniceoba fault zones: İnönü-Eskişehir fault system, Central Anatolia. Turkish Journal of Earth Sciences 16, no.4 (2007): 471 - 492. |
MLA | Özsayin Erman,DİRİK Kadir Quaternary activity of the Cihanbeyli and Yeniceoba fault zones: İnönü-Eskişehir fault system, Central Anatolia. Turkish Journal of Earth Sciences, vol.16, no.4, 2007, ss.471 - 492. |
AMA | Özsayin E,DİRİK K Quaternary activity of the Cihanbeyli and Yeniceoba fault zones: İnönü-Eskişehir fault system, Central Anatolia. Turkish Journal of Earth Sciences. 2007; 16(4): 471 - 492. |
Vancouver | Özsayin E,DİRİK K Quaternary activity of the Cihanbeyli and Yeniceoba fault zones: İnönü-Eskişehir fault system, Central Anatolia. Turkish Journal of Earth Sciences. 2007; 16(4): 471 - 492. |
IEEE | Özsayin E,DİRİK K "Quaternary activity of the Cihanbeyli and Yeniceoba fault zones: İnönü-Eskişehir fault system, Central Anatolia." Turkish Journal of Earth Sciences, 16, ss.471 - 492, 2007. |
ISNAD | Özsayin, Erman - DİRİK, Kadir. "Quaternary activity of the Cihanbeyli and Yeniceoba fault zones: İnönü-Eskişehir fault system, Central Anatolia". Turkish Journal of Earth Sciences 16/4 (2007), 471-492. |