2023 年帕扎尔西克 7.7 级地震导致东安纳托利亚断层西南分支的垂直运动发生逆转

IF 2.6 2区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Journal of Structural Geology Pub Date : 2024-05-24 DOI:10.1016/j.jsg.2024.105172
Zheng Gong , Haibing Li , Huiping Zhang , Kerem Kuterdem , Shiguang Wang , Jialiang Si , Yong Zheng , Peng Liang , Chenglong Li , Chuanyou Li , Zhikun Ren , Jingxing Yu , Xiaocheng Zhou , Yueren Xu , Zhifa Ma , Junjie Li , Fangtou Tang
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引用次数: 0

摘要

虽然阿拉伯-安纳托利亚-非洲交界处的构造变形对理解地中海东部构造至关重要,但其构造变形(伸展型还是压缩型)仍有争议。为了研究这个问题,我们对 2023 年 Mw7.7 Pazarcik 地震沿阿马诺斯山脉的地表断裂进行了实地勘测,并对相关断层岩进行了微观结构和成分分析。地表断裂呈现出横断分支,主、次级断层的正弦(法线)偏移分别为 2.0-4.0 (0.4-0.9) 米和 1.0 (0.2) 米。同时,砾岩(26%方解石、38%蛇纹石和 36%闪长岩)在显微镜下也以张裂纹为主。与广泛的伸展变形不同,地质证据表明,该断层在第四纪曾经历过反向滑动,这一点从蛇纹岩向冲积层的推移以及 R 叶理与反向剪切的一致性可以看出。我们将其解释为东安纳托利亚断层(East Anatolia fault,EAF)在西南部的延续,该断层以前以转位变形为特征,在此次地震中由于断层走向的改变而重新以转位张拉的方式激活。在更广泛的地中海构造框架中,阿马诺斯地段可被解释为连接卡拉苏断层和东安纳托利亚断层的新近形成的部分。
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The 2023 Mw7.7 Pazarcik earthquake caused a reversal in vertical motion along the SW branch of the East Anatolian fault

While the structural deformation at the Arabia-Anatolia-Africa junction is critical for understanding eastern Mediterranean tectonics, it remains debatable (extensional or compressional). Field survey of the 2023 Mw7.7 Pazarcik earthquake surface rupture along the Amanos Range, and microstructure and composition analyses of related fault rock were performed to investigate this issue. The surface rupture shows transtensional branches, with the main and secondary strands displaying sinistral (normal) offsets of 2.0–4.0 (0.4–0.9) and 1.0 (0.2) m. Slip plane of the secondary fault is marked by a ∼20 cm wide extensional fracture dividing fault breccia from gouge. Meanwhile, the gouge (26 % calcite, 38% serpentine and 36% smectite) is also dominated by tension cracks microscopically. In contrast to the widespread extensional deformation, geological evidence imply that this fault had experienced reverse slip in the Quaternary, as shown by thrusting of serpentine onto alluvium and the consistency of R foliations with reverse shear. We interpret it as the SW continuation of the East Anatolia fault (EAF) that was formerly characterized by transpressional deformation, and reactivated transtensionally due to the change of fault strike during this earthquake. In the broader Mediterranean tectonics framework, the Amanos segment might be interpreted as a recently formed component linking the Karasu fault to the EAF.

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来源期刊
Journal of Structural Geology
Journal of Structural Geology 地学-地球科学综合
CiteScore
6.00
自引率
19.40%
发文量
192
审稿时长
15.7 weeks
期刊介绍: The Journal of Structural Geology publishes process-oriented investigations about structural geology using appropriate combinations of analog and digital field data, seismic reflection data, satellite-derived data, geometric analysis, kinematic analysis, laboratory experiments, computer visualizations, and analogue or numerical modelling on all scales. Contributions are encouraged to draw perspectives from rheology, rock mechanics, geophysics,metamorphism, sedimentology, petroleum geology, economic geology, geodynamics, planetary geology, tectonics and neotectonics to provide a more powerful understanding of deformation processes and systems. Given the visual nature of the discipline, supplementary materials that portray the data and analysis in 3-D or quasi 3-D manners, including the use of videos, and/or graphical abstracts can significantly strengthen the impact of contributions.
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