Seismotectonic investigation in northwest Zagros, Iran: analysis of Ezgeleh Mw 7.3 aftershocks

IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Journal of Seismology Pub Date : 2024-01-17 DOI:10.1007/s10950-023-10184-2
Zahra Nazarinezhad, Mohammadreza Sepahvand, Afsaneh Nasrabadi
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Abstract

Zagros, on the Alpine-Himalayan belt, has undergone significant tectonic tension due to the convergence of the Arabian and Eurasian plates, resulting in numerous faults, folds, and thrusts. Despite extensive research, uncertainties persist regarding its seismotectonic features and active faults. This study aims to identify causative faults for earthquakes within this region by calculating focal mechanisms of 47 earthquakes that occurred in northwest Zagros and examining seismicity at depth. In this pursuit, 12 cross-sections have been delineated within the region. The spatial distribution of earthquakes within these sections, coupled with the computed focal mechanisms, serves as indicators of the causative fault. The study attributes a significant proportion of the recorded earthquakes to different segments of the Mountain Front Fault and estimates the length of some segments to exceed what is depicted in geological maps. Clear trends in the depth distribution of earthquakes and alignment of some features with previous studies suggest the activity of hidden faults and the influence of an arc in the study area. The collective results provide a comprehensive understanding of the proposed arc, further reinforced by the identification of a strike-slip fault intersecting the High Zagros Fault, serving as tangible evidence of the arc’s existence.

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伊朗扎格罗斯西北部地震构造调查:Ezgeleh 7.3 级余震分析
摘要 扎格罗斯位于阿尔卑斯-喜马拉雅山带上,由于阿拉伯板块和欧亚板块的交汇,这里经历了巨大的构造张力,形成了众多断层、褶皱和推力。尽管进行了大量研究,但有关其地震构造特征和活动断层的不确定性依然存在。本研究旨在通过计算发生在扎格罗斯西北部的 47 次地震的病灶机制,并检查深部地震活动性,来确定该地区地震的成因断层。为此,在该地区划定了 12 个横断面。这些断面内地震的空间分布,加上计算出的震源机制,可作为成因断层的指标。该研究将记录的地震中的很大一部分归因于山前断层的不同区段,并估计某些区段的长度超过了地质图上的描述。地震深度分布的明显趋势以及某些特征与以往研究的一致性表明,研究区域存在隐藏断层的活动和弧形断层的影响。这些综合结果提供了对拟议中的弧的全面了解,与高扎格罗斯断层相交的走向滑动断层的确定进一步加强了对弧的了解,成为弧存在的具体证据。
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来源期刊
Journal of Seismology
Journal of Seismology 地学-地球化学与地球物理
CiteScore
3.30
自引率
6.20%
发文量
67
审稿时长
3 months
期刊介绍: Journal of Seismology is an international journal specialising in all observational and theoretical aspects related to earthquake occurrence. Research topics may cover: seismotectonics, seismicity, historical seismicity, seismic source physics, strong ground motion studies, seismic hazard or risk, engineering seismology, physics of fault systems, triggered and induced seismicity, mining seismology, volcano seismology, earthquake prediction, structural investigations ranging from local to regional and global studies with a particular focus on passive experiments.
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