Abstract
The North Anatolian Fault showed a remarkable seismic activity especially between 1939 and 1999, when the westward migrating earthquake sequence created surface ruptures more than 1000 km, leaving unbroken only the Marmara segments, to the west, and the Yedisu Segment, to the east along the main strand of the fault. To understand the palaeoseismicity of the Yedisu Seismic Gap, we undertook trench investigations close to the village of Balaban Sarıkaya, on the western part of the Yedisu Segment. We found evidence for at least five surface faulting earthquakes, from which only two are correlated with the 18 July 1784 CE and 27 June 1583 CE historical events. Although the surface rupture of the 1784 CE was reported by other trench studies, the evidence of 1583 CE event is presented for the first time. In consideration with other historical earthquakes, affecting the region east of Erzincan, we suggest that this particular section of the North Anatolian Fault may be in a seismically quiescent period, following a cluster of earthquakes in its near history. In order to test this hypothesis, further studies are needed to increase our knowledge on the temporal and spatial seismic behaviour of the Yedisu Segment, which has potential to create an earthquake with M w ~7.2 in the near future.
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Notes
“The term Scholle has been used by German-speaking geologists to describe the deformational pattern of the Alpine foreland, caused by rigid or semi-rigid crustal blocks bounded by reverse, normal and/or strike-slip belts. This term is appropriate to describe also the crustal fragments and splinters that form, as a result of complex strain patterns, during continental collision, and by the virtue of their tectonic nature and behaviour cannot be termed ‘plates’” by Dewey and Şengör (1979) Aegean and surrounding regions: complex multiplate and continuum tectonics in a convergent zone. Geological Society of America Bulletin 90:84–92. doi:10.1130/0016–7606(1979), p. 84.
“Taphrogens are lithospheric-scale structures, commonly formed from a linked system of rifts and grabens that stretch the lithosphere” by Şengör and Natal'in (2001) Rifts of the world. Geological Society of America Special Papers 352:389–482 p. 391.
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Acknowledgments
This study is supported by TÜBİTAK grant no. 106Y174 and İTÜ BAP no. 31285. We wish to thank all local authorities, particularly to the former governor of the Yedisu town Mr. İlker Özerk Özcan, for their support, land owner for giving us permission to excavate his land and people of Balaban Sarıkaya, especially to Gülabi Amca, for their great hospitality. Pınar Gutsuz assisted some parts of the field studies. We are also very grateful to the editor Dr. Mariano Garcia-Fernandez and an anonymous reviewer, who significantly improved the content of this paper. Some of figures were made by using the Generic Mapping Tools (GMT) software (Wessel et al. 2013).
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Zabcı, C., Akyüz, H.S. & Sançar, T. Palaeoseismic history of the eastern part of the North Anatolian Fault (Erzincan, Turkey): Implications for the seismicity of the Yedisu seismic gap. J Seismol 21, 1407–1425 (2017). https://doi.org/10.1007/s10950-017-9673-1
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DOI: https://doi.org/10.1007/s10950-017-9673-1