The Manyas fault zone (southern Marmara region, NW Turkey): active tectonics and paleoseismology

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KÜRÇER A., Ozaksoy V., ÖZALP S., Guldogan C. U., ÖZDEMİR E., Duman T. Y.

GEODINAMICA ACTA, cilt.29, sa.1, ss.42-61, 2017 (SCI-Expanded) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 29 Sayı: 1
  • Basım Tarihi: 2017
  • Doi Numarası: 10.1080/09853111.2017.1294013
  • Dergi Adı: GEODINAMICA ACTA
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.42-61
  • Anahtar Kelimeler: NW Anatolia, southern Marmara, Manyas fault zone, Manyas earthquake, paleoseismology, NORTH ANATOLIAN FAULT, ALPINE-HIMALAYAN BELT, AEGEAN SEA, MEDITERRANEAN REGION, KINEMATIC ANALYSIS, PAST EARTHQUAKES, WESTERN TURKEY, DEFORMATION, PALAEOSEISMOLOGY, CONSTRAINTS
  • Akdeniz Üniversitesi Adresli: Hayır

Özet

The Manyas fault zone (MFZ) is a splay fault of the Yenice Gonen Fault, which is located on the southern branch of the North Anatolian Fault System. The MFZ is a 38 km long, WNW-ESE-trending and normal fault zone comprised of three en-echelon segments. On 6 October 1964, an earthquake (Ms = 6.9) occurred on the Salur segment. In this study, paleoseismic trench studies were performed along the Salur segment. Based on these paleoseismic trench studies, at least three earthquakes resulting in a surface rupture within the last 4000 years, including the 1964 earthquake have been identified and dated. The penultimate event can be correlated with the AD 1323 earthquake. There is no archaeological and/or historical record that can be associated with the oldest earthquake dated between BP 3800 +/- 600 and BP 2300 +/- 200 years. Additionally, the trench study performed to the north of the Salur segment demonstrates paleoliquefaction structures crossing each other. The surface deformation that occurred during the 1964 earthquake is determined primarily to be the consequence of liquefaction. According to the fault plane slip data, the MFZ is a purely normal fault demonstrating a listric geometry with a dip of 64 degrees-74 degrees to the NNE.