Palaeoseismology of the Havran-Balıkesir Fault Zone: evidence for past earthquakes in the strike-slip-dominated contractional deformation along the southern branches of the North Anatolian fault in northwest Turkey

IF 1.5 Q1 Earth and Planetary Sciences Geodinamica Acta Pub Date : 2016-04-18 DOI:10.1080/09853111.2016.1171111
H. Sözbilir, Ç. Özkaymak, Bora Uzel, Ökmen Sümer, Semih Eski, Ç. Tepe
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引用次数: 20

Abstract

The Havran-Balıkesir Fault Zone (HBFZ) is one of the major active structures of the Southern Marmara Region, which has been shaped by the southern branch of North Anatolian fault since the Pliocene. HBFZ is a 10–12 km wide, 120 km long, right-lateral strike-slip fault zone that consists of two ENE-striking main faults, namely, the Havran-Balya and Balıkesir faults. The 90-km-long Havran-Balya fault exhibits right-stepping en echelon geometry and is made up of (1) Havran, (2) Osmanlar, (3) Turplu and (4) Ovacık fault segments. On the eastern part, the 70-km-long Balıkesir fault is divided into two fault segments; (1) Gökçeyazı and (2) Kepsut. We estimated the long-term slip rate between 3.59 and 3.78 mm/yr using river offset. The Kepsut, Gökçeyazı and Ovacık fault segments are capable of generating an earthquake with a moment magnitude of up to 7.2. Detailed palaeoseismological studies show that the HBFZ is responsible for some surface faulting earthquakes with an average recurrence interval of 1000–2000 years during the late Holocene. Considering the fact that there was no evidence of a surface-ruptured earthquake for 2000 years, it can be stated that there is a seismic gap on the Gökçeyazı fault segment.
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Havran-Balıkesir断裂带的古地震学:土耳其西北部北安那托利亚断裂带南部分支沿走滑主导的收缩变形的过去地震证据
Havran-Balıkesir断裂带是北安纳托利亚断裂南支自上新世以来形成的南马尔马拉地区的主要活动构造之一。HBFZ是一条宽10-12公里,长120公里的右旋走滑断裂带,由两条走向ene的主断层,即Havran-Balya断层和Balıkesir断层组成。长90 km的Havran- balya断层呈右步行阶梯形,由(1)Havran、(2)Osmanlar、(3)Turplu和(4)Ovacık断裂段组成。东部长70公里的Balıkesir断层分为两个断层段;(1) Gökçeyazı (2) Kepsut。利用河流偏移量,我们估计长期滑移率在3.59 ~ 3.78 mm/年之间。Kepsut、Gökçeyazı和Ovacık断层段能够产生矩震级高达7.2级的地震。详细的古地震学研究表明,在全新世晚期,hbbfz是一些地表断裂地震的成因,平均复发间隔为1000-2000年。考虑到2000年来没有发生地表破裂地震的证据,可以认为Gökçeyazı断层段存在地震间隙。
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来源期刊
Geodinamica Acta
Geodinamica Acta 地学-地球科学综合
CiteScore
4.50
自引率
0.00%
发文量
0
审稿时长
25 weeks
期刊介绍: Geodinamica Acta provides an international and interdisciplinary forum for the publication of results of recent research dealing with both internal and external geodynamics. Its aims to promote discussion between the various disciplines that work on the dynamics of the lithosphere and hydrosphere. There are no constraints over themes, provided the main thrust of the paper relates to Earth''s internal and external geodynamics. The Journal encourages the submission of papers in all fields of earth sciences, such as biostratigraphy, geochemistry, geochronology and thermochronology, geohazards and their societal impacts, geomorphology, geophysics, glaciology, igneous and metamorphic petrology, magmatism, marine geology, metamorphism, mineral-deposits and energy resources, mineralogy, orogeny, palaeoclimatology, palaeoecology, paleoceanograpgy, palaeontology, petroleum geology, sedimentology, seismology and earthquakes, stratigraphy, structural geology, surface processes, tectonics (neoteoctonic, plate tectonics, seismo-tectonics, Active tectonics) and volcanism. Geodinamica Acta publishes high quality, peer-reviewed original and timely scientific papers, comprehensive review articles on hot topics of current interest, rapid communications relating to a significant advance in the earth sciences with broad interest, and discussions of papers that have already appeared in recent issues of the journal. Book reviews are also included. Submitted papers must have international appeal and regional implications; they should present work that would be of interest to many different specialists. Geographic coverage is global and work on any part of the world is considered. The Journal also publishes thematic sets of papers on topical aspects of earth sciences or special issues of selected papers from conferences.
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