Tectonic geomorphology of Bozdoğan and Karacasu grabens, western Anatolia

IF 1.3 4区 地球科学 Q2 GEOLOGY Geologica Acta Pub Date : 2023-02-27 DOI:10.1344/geologicaacta2023.21.1
E. Özsayın, K. Dirik, F. Ocakoğlu, Sanem Açıkalın Cartigny, Azad sağlam selcuk
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Abstract

Western Anatolia is one of the most rapidly extending and seismically active regions in the world. The circa N-S extension since the Early Miocene caused the formation of E-W trending major grabens and intervening horsts, having earthquake potentials with magnitude ≥5. The E-W oriented Büyük Menderes graben cross-cuts the broadly N-S oriented Bozdoğan and Karacasu grabens, of which the boundary faults of the latter are the source of seismic activity. Geomorphic indices, including drainage basin asymmetry, mountain front sinuosity, valley-floor width to valley height ratio, stream length-gradient index and normalized channel steepness index, were used to evaluate the boundary fault segments of the Bozdoğan and Karacasu grabens. The results indicate that both grabens are tectonically active and therefore regions of earthquake potential, consistent with the epicenters of earthquakes. Thus, it can be inferred that fault segments of second-order grabens, which are crosscut by the boundary faults of seismically active main depressions, are apparently reactivated by ongoing tectonism and may represent seismic activity. This suggestion applies also for similar basins located in the western Anatolia.
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安纳托利亚西部Bozdoğan和Karacasu地堑的构造地貌
安纳托利亚西部是世界上延伸最快、地震最活跃的地区之一。早中新世以来的南北向伸展导致了东西走向的主要地堑和中间地垒的形成,具有≥5级的地震潜力。东西向的Büyük-Menderes地堑横切了大致南北向的Bozdoğan和Karacasu地堑,后者的边界断层是地震活动的来源。利用流域不对称性、山前弯度、谷底宽谷高比、河流长度梯度指数和归一化河道陡度指数等地貌指标对Bozdoğan和Karacasu地堑的边界断裂段进行了评价。结果表明,这两个地堑都是构造活跃的,因此具有地震潜力的区域,与震中一致。因此,可以推断,被地震活跃的主凹陷的边界断层横切的二阶地堑的断层段显然被正在进行的构造作用重新激活,并且可能代表地震活动。这一建议也适用于位于安纳托利亚西部的类似盆地。
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来源期刊
Geologica Acta
Geologica Acta 地学-地质学
CiteScore
2.50
自引率
6.70%
发文量
13
审稿时长
>12 weeks
期刊介绍: - Relevant conceptual developments in any area of the Earth Sciences. - Studies presenting regional synthesis. - Thematic issues or monographic volumes presenting the results from one or more research groups. - Short papers reflecting interesting results or works in progress. - Contributions and results from Research Projects, Workshops, Symposiums, Congresses and any relevant scientific activity related to Earth Sciences. - Geologica Acta aims to stimulate rapid diffusion of results and efficient exchange of ideas between the widespread communities of Earth Science researchers (with special emphasis on Latinamerica, the Caribbean, Europe, the Mediterranean
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