The Yenice – Gönen active fault (NW Turkey): active tectonics and paleoseismology

 
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The Yenice – Gönen active fault (NW Turkey): active tectonics and paleoseismology

Ateş, Özkan
Valkaniotis, Sotiris
Tutkun, Salih Zeki
Kürçer, Akın
Pavlidis, Spyridon
Chatzipetros, Alexandros

The Yenice–Gönen Fault (YGF) is one of the most important active tectonic structures in the Biga peninsula. On March 18, 1953, a destructive earthquake (Mw = 7.2) occurred on the YGF, which is considered to be a part of the southern branch of the North Anatolian Fault Zone (NAFZ). A 70 km-long dextral surface rupture formed during the Yenice–Gönen Earthquake (YGE). In this study, structural and palaeoseismological features of the YGF have been investigated. The YGF surface ruptures have been mapped and three trenches were excavated at Muratlar, Karaköy and Seyvan sites. According to the palaeoseismic interpretation and the results of 14C AMS dating, Seyvan trench shows that an earthquake of palaeoseismic age ca. 620 AD ruptured a different strand of the 1953 fault, producing rather significant surface rupture displacement, while there are indications that at least two older events occurred during the past millennia. Another set of trenches excavated near Gönen town (Muratlar village) revealed extensive liquefaction not only during the 1953 event, but also during a previous earthquake, dated at 1440 AD. The Karaköy trench shows no indications of recent reactivations. Based on the trenching results, we estimate a recurrence interval of 660 ± 160 years for large morphogenic earthquakes, creating linear surface ruptures. The maximum reported displacement during the 1953 earthquake was 4.2 m. Taking into account the palaeoseismologically determined earthquake recurrence interval and maximum displacement, slip-rate of the YGF has been calculated to be 6.3 mm/a, which is consistent with present-day velocities determined by GPS measurements. According to the geological investigations, cumulative displacement of the YGF is 2.3 km. This palaeoseismological study contributes to model the behaviour of large seismogenic faults in the Biga Peninsula

Article / Άρθρο
info:eu-repo/semantics/article

Palaeoseismology
Earthquake recurrence interval
Yenice–Gönen Earthquake
Yenice–Gönen Fault
Ρήγμα Βόρειας Ανατολίας
Παλαιοσεισμολογία
North Anatolian Fault

Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (EL)
Aristotle University of Thessaloniki (EN)

2008
2009-10-29T12:52:13Z


Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης, Σχολή Θετικών Επιστημών, Τμήμα Γεωλογίας

Tectonophysics, vol.453 no.1-4 [2008] p.263-275 [Published Version]
urn:ISSN:00401951

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info:eu-repo/semantics/openAccess



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