Sançar, Taylan; Zabci, Cengiz; Karabacak, Volkan; Yazici, Muge; Akyüz, H. Serdar

The sinistral Malatya-Ovack Fault Zone (MOFZ) is one of the outstanding intraplate deformation belts within Anatolia. The 165-km-long, NE-SW-striking Malatya Fault (MF), which constitutes the southern section of the MOFZ, is separated into five segments according to its surface geometry. These segments have evident morphotectonic features that reflect long- and short-term fault activity, such as morphologic structures offset by as little as 7m and as much as 7.3km. This study provides results from the first paleoseismological investigations on the MF. We find that the last earthquake occurred between 965 and 549 BCE and calculate a recurrence interval of 2275 +/- 605years from evidence for four paleo-events over the last 10ka. Considering fault segmentation and our paleoseismological data, we propose that the accumulated strain on the MF may cause a destructive earthquake (M=7.4) in the near future. Our results support the hypotheses that the MF and other NW-striking dextral and NE-striking sinistral strike-slip faults within the eastern part of Anatolia are plate boundary-related, active deformational structures.

AtıfWoS19·OpenAlex29

İncele

Sançar, Taylan; Akyüz, H. Serdar; Schreurs, Guido; Zabci, Cengiz

AtıfOpenAlex10

İncele

Zabci, Cengiz; Akyüz, H. Serdar; Sançar, Taylan

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 SarA +/- kaya, 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) similar to 7.2 in the near future.

AtıfWoS15·OpenAlex23

İncele

Sançar, Taylan; Zabci, Cengiz; Akyüz, H. Serdar; Sunal, Gursel; Villa, Igor M.

AtıfOpenAlex19

İncele

Zabci, Cengiz; Sançar, Taylan; Akyüz, H. Serdar; Kiyak, Nafiye Gunec

AtıfOpenAlex18

İncele

Akyüz, H. Serdar; Sançar, Taylan

Dünyadaki en aktif deformasyon kuşaklarından olan Kuzey Anadolu Fay Zonu (KAFZ) üzerinde son yüzyılda gerçekleşen depremler 1000 kmden fazla yüzey kırığı oluşturmuştur. KAFZnin farklı kesimlerinden elde edilen paleosismik veriler fay zonunun deprem tarihçesi hakkında önemli bilgiler vermiştir. KAFZnin en doğusunda yer alan Ilıpınar Segmentinin son yüzyılda gerçekleşen depremler ile olan ilişkisini ve eski deprem tarihçesini araştırmak amacıyla, Ilıpınar Segmentinin doğu ucunda yer alan Yoncalık havzası üzerinde iki tane paleosismolojik hendek çalışması gerçekleştirilmiştir. Yoncalık-1 hendeğinden elde edilen radyokarbon yaşlandırma sonuçları MÖ 8500-6150 ve MÖ 5960-4300 tarihleri arasında Ilıpınar segmenti üzerinde yüzey kırığı oluşturan iki depremi göstermektedir. Yoncalık-2 hendeğinden elde edilen veriler ise segment üzerinde MÖ 6325 tarihinden önce ve MÖ 6325-2105 tarihleri arasında yüzey kırığı oluşturan depremleri göstermektedir. Bu depremlerin tarih aralıkları geniş olsa da birbirleri ile uyumludur. Yoncalık-2 hendeğinde MÖ 6325 öncesinde olan depremin Yoncalık-1 hendeğinde MÖ 8500-6150 arasında olan deprem ile aynı olduğu düşünülmektedir. Yoncalık-2 hendeğindeki MÖ 6325-2105 tarihleri arasında olmuş depremin ise Yoncalık-1 hendeğindeki MÖ 5960-4300 tarihleri arasında olmuş deprem ile aynı deprem olması yüksek bir olasılık olarak değerlendirilmiştir. KAFZnin en doğu ucunu oluşturan Ilıpınar Segmenti üzerinde yapılan paleosismoloji çalışmalarından edinilen bulgular segmentin deprem üretme davranışının KAFZnin genel karakteri ile uyumlu olmadığını göstermektedir. Bu uyumsuzluğun nedeni Karlıova Üçlü Eklemi civarındaki kompleks fay geometrisi ve buna bağlı olarak biriken yamulmanın bu yapılar tarafından paylaşılması olarak değerlendirilmiştir.

AtıfTR Dizin2

İncele

Sançar, Taylan; Akyüz, H. Serdar

The last century earthquakes produced more than 1000 km surface rupture on the North Anatolian Fault Zone (NAFZ), which is one of the most active deformation belts in the World. Paleoseismic data from different parts of the NAFZ exposes critical information about the earthquake history of the fault zone. To research paleoseismicity of the Ilipinar Segment and relationship between the segment and last century earthquakes, two paleoseismologic trench studies performed on the Yoncalik basin, where positioned at eastern section of the Ilipinar segment. We identified two paleo-earthquakes, which correspond to BC 8500-6150 and BC 5960-4300 time intervals in the Yoncalik-1 trench. On the other hand the analyses of stratigraphy and structural features of the Yoncalik-2 trench similarly yield two events, from which the older happened before BC 6325 and the younger was between BC 6325-2105. Despite of the wide range of these intervals, both trench results are coincide within their uncertainty limits. We interpret that events in both trenches reflects the same surface ruptures. By the joint analysis of both trenches, we conclude that the most recent and penultimate events should have occurred between BC 5960-4300 and BC 8500-6325, respectively. The results from paleoseismology of the Ilipinar Segment, which constitute the easternmost part of the NAFZ, indicate that the seismic behaviour of the segment is not in accord with the general characteristic of the NAFZ. The reasons behind the disparity are considered to be related with complex fault geometry in the vicinity of Karliova triple junction and partitioning of accumulated strain on these structures.

AtıfWoS7·OpenAlex5

İncele