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Kinematic analysis and palaeoseismology of the Edremit Fault Zone: evidence for past earthquakes in the southern branch of the North Anatolian Fault Zone, Biga Peninsula, NW Turkey
Geodinamica Acta ( IF 1.5 ) Pub Date : 2016-04-27 , DOI: 10.1080/09853111.2016.1175294
Hasan Sözbilir 1, 2 , Ökmen Sümer 1 , Çağlar Özkaymak 3, 4 , Bora Uzel 1 , Tayfun Güler 1 , Semih Eski 2
Affiliation  

The Edremit Fault Zone (EFZ) forms one of the southern segments of the North Anatolian Fault Zone (NAFZ) at the northern margin of the Edremit Gulf (Biga Peninsula, South Marmara Region, Turkey). Stratigraphic, structural and kinematic results indicate that basinward younging of the fault zone, in terms of a rolling-hinge mechanism, has resulted in at least three discrete Miocene to Holocene deformational phases: the oldest one (Phase 1) directly related to the inactive Kazdağ Detachment Fault, which was formed under N–S trending pure extension; Phase 2 is characterised by a strike-slip stress condition, probably related to the progression of the NAFZ towards the Edremit area in the Plio–Quaternary; and Phase 3 is represented by the high-angle normal faulting, which is directly interrelated with the last movement of the EFZ. Our palaeoseismic studies on the EFZ revealed the occurrence of three past surface rupture events; the first one occurred before 13178 BC, a penultimate event that may correspond to either the 160 AD or 253 AD historical earthquakes, and the youngest one can be associated with the 6 October 1944 earthquake (Mw = 6.8). These palaeoseismic data indicate that there is no systematic earthquake recurrence period on the EFZ.

中文翻译:

Edremit 断层带的运动学分析和古地震学:土耳其西北部比加半岛北安纳托利亚断层带南支过去地震的证据

Edremit 断层带 (EFZ) 是 Edremit 海湾(土耳其南马尔马拉地区的比加半岛)北缘的北安纳托利亚断层带 (NAFZ) 的南段之一。地层、构造和运动学结果表明,就滚动铰链机制而言,断层带的盆地年轻化导致了至少三个离散的中新世至全新世变形阶段:最古老的阶段(阶段 1)与不活动的 Kazdağ 直接相关分离断层,形成于南北向纯伸展下;阶段 2 的特征是走滑应力条件,可能与 NAFZ 向 Plio-第四纪 Edremit 地区的进展有关;阶段 3 以大角度正断层为代表,与 EFZ 的最后一次运动直接相关。我们对 EFZ 的古地震研究揭示了过去三个地表破裂事件的发生;第一次发生在公元前 13178 年之前,倒数第二次事件可能对应于公元 160 年或公元 253 年的历史地震,而最年轻的一次可以与 1944 年 10 月 6 日的地震(Mw = 6.8)有关。这些古地震数据表明,EFZ 没有系统的地震复发期。
更新日期:2016-04-27
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