Determining the main strand of the Eskişehir strike-slip fault zone using subsidiary structures and seismicity: A hypothesis tested by seismic reflection studies

SEYİTOĞLU G., Ecevitoğlu G. B., KAYPAK B., GÜNEY Y., TÜN M., ESAT K., ...More

Turkish Journal of Earth Sciences, vol.24, no.1, pp.1-20, 2015 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 24 Issue: 1
  • Publication Date: 2015
  • Doi Number: 10.3906/yer-1406-5
  • Journal Name: Turkish Journal of Earth Sciences
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, TR DİZİN (ULAKBİM)
  • Page Numbers: pp.1-20
  • Keywords: Neotectonics, Turkey, Eskisehir, earthquake, focal mechanism solutions, seismic reflection method, EPISODIC 2-STAGE EXTENSION, EARTHQUAKE LOCATION, TECTONIC EVOLUTION, WESTERN TURKEY, GEDIZ GRABEN, BASIN, ANATOLIA, STRESS, SEA, NW
  • Anadolu University Affiliated: Yes


© 2014 TUBITAK. All rights reserved.The Eskişehir Fault Zone is one of the major neotectonic structures of Turkey, extending from İnegöl (Bursa) to Cihanbeyli (Konya). The fault zone presents a considerable seismic risk for the city of Eskişehir but the exact locations of active segments and the source of the major seismic event, the 1956 earthquake (M = 6.5) that occurred in the instrumental period (from 1900 to 2013), have been debated in recent literature. The structural data obtained from field studies indicate an approximately N60W-trending main strand of the right lateral strike-slip Eskişehir Fault Zone. This trend corresponds to the en echelon bends on the course of the Sarısu River. Using this concurrence, the positions of Bahçehisar and the Çukurhisar-Sultandere segments are proposed and checked by seismic reflection studies. The seismic sections disclosing positive flower structures confirm the hypothesized position of the Çukurhisar- Sultandere segment. The relocation of epicenters and focal mechanism solutions of seismic events in 1956, 1990, 2010, and 2013 indicate that the Çukurhisar-Sultandere segment might be the rupture source of the 1956 event and is a possible potential seismic source for an earthquake that could seriously affect the Eskişehir settlement.