Transpressive Tectonics Evidence in the Epicentral Area of the Modern Earthquake in Constantine Area of Algerian Eastern Tell Atlas: New Insights from Rhumel Valley

IF 1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Geotectonics Pub Date : 2024-04-18 DOI:10.1134/s0016852124700067
S. Aourari, D. Machane, M. Guemache, H. Haddoum, A. Benhamouche, H. Moulouel, S. Sadrati, N. Sidi Said, D. Ait Benamar
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Abstract

The neotectonic processes are crucial for identification of active faults in a seismic unstable area. The Aїn Smara active fault runs along the Middle Rhumel Valley located in Constantine area of Algerian Eastern Tell Atlas mountain chain and it emerges in the south‒western part of the epicentral zone of the earthquake occurred on October 27, 1985 (Mw = 5.8) within a corridor displaying morphological features and deformed Pliocene‒Quaternary layers, which are the consequence of transpressive tectonic regime. In our study the morpho-tectonic and structural research supported by the fieldwork, was performed. The thick fault gouge indicating simple shear deformation, fault breccias and minor faults affecting the Pliocene limestone and Quaternary alluvial terraces, were found. The active fault splits into northern and southern segments. The northern segment corresponds to the El Aria Fault that ruptured during the earthquake in 1985 and the southern segment with the studied Aĭn Smara Fault. Our research showed the significant extent of the active fault and including its parameters for improved seismic hazard assessment of the Constantine area.

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阿尔及利亚东泰勒阿特拉斯地区君士坦丁现代地震震中区的透射构造证据:来自鲁梅尔山谷的新见解
摘要 新构造过程对于识别地震不稳定地区的活动断层至关重要。艾因斯马拉活动断层沿着位于阿尔及利亚东泰勒阿特拉斯山脉康斯坦丁地区的中鲁梅尔山谷运行,它位于 1985 年 10 月 27 日发生的地震(Mw = 5.8)震中区的西南部,在一条走廊内显示出形态特征和上新世-第四纪地层变形,这是转位构造机制的结果。在我们的研究中,在实地考察的支持下进行了形态构造和结构研究。我们发现了厚厚的断层冲沟,表明了简单的剪切变形、断层破碎带和影响上新世石灰岩和第四纪冲积阶地的小断层。活动断层分为南北两段。北段与 1985 年地震中断裂的 El Aria 断层相对应,南段与研究中的 Aĭn Smara 断层相对应。我们的研究显示了活动断层的重要范围,并将其参数纳入其中,以改进君士坦丁地区的地震灾害评估。
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来源期刊
Geotectonics
Geotectonics 地学-地球化学与地球物理
CiteScore
1.90
自引率
9.10%
发文量
28
审稿时长
3 months
期刊介绍: Geotectonics publishes articles on general and regional tectonics, structural geology, geodynamics, and experimental tectonics and considers the relation of tectonics to the deep structure of the earth, magmatism, metamorphism, and mineral resources.
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