指向性分析和震源参数估计:2014 年阿尔及利亚西北部阿尔泽夫 Mw3.9 地震的启示

IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Journal of Seismology Pub Date : 2024-06-25 DOI:10.1007/s10950-024-10226-3
Oualid Boulahia, Fethi Semmane
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引用次数: 0

摘要

2014 年 3 月 20 日,阿尔及利亚阿尔泽夫附近发生了 Mw3.9 级地震,引发了一项研究,以加深对该地区地震活动和危害的理解。通过分析阿尔及利亚和西班牙地震网络的数据,我们探索了地震特征和破裂机制。这次地震的震中位于北纬 35.825°,东经-0.366°,震源深度 7 千米,在阿尔泽乌-奥兰地区表现出 IV-V 级烈度。在此次地震之前,2014 年 2 月 1 日在同一地点发生了一次 MD3.1 级前震。前震和主震的波形表现出惊人的相似性,验证了用于解卷积的经验绿色函数方法的有效性。通过波形反演和 P 波极性,我们估算了震源机制,发现这是一种近乎纯粹的走向滑动机制,节点平面的方向为 ~E-W 和 ~N-S。断裂过程以多次发作为特征,主要从南面向 N5°-15°E方向传播,速度约为 2.7 千米/秒,在 0.32 秒内沿 870 米的断层长度传播。主震的断层面被确定为 N-S 平面,表明了断裂传播的方向。与单个频谱估计相比,利用 EGF 方法进行的震源参数估计显示了更大的角频率和应力下降,这归因于该方法改进了对衰减和现场效应的校正,而无需简化先验模型。尽管震级较低,但 2014 年阿尔泽夫地震为该地区的地震行为提供了宝贵的见解,对地动预测做出了重大贡献。特别是,该研究强调了在地震灾害评估和减灾战略中考虑破裂指向性的必要性。
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Directivity analysis and source parameter estimation: insights from the 2014 Arzew earthquake, Mw3.9, northwestern Algeria

The March 20, 2014, magnitude Mw3.9 earthquake near Arzew, Algeria, instigated a study to deepen comprehension of seismic activity and hazard in the region. Analyzing data from Algerian and Spanish seismic networks, we explored earthquake characteristics and rupture mechanisms. The earthquake's epicenter was located at 35.825° latitude and -0.366° longitude, with a depth of 7 km, exhibiting intensity IV-V in the Arzew-Oran area. Preceding this event, a magnitude MD3.1 foreshock occurred on February 1, 2014, at the same location. The waveforms of the foreshock and mainshock exhibited striking similarities, validating the effectiveness of the Empirical Green's Function method employed for deconvolution. Through waveform inversion and P-wave polarities, we estimated the focal mechanism, revealing a near-pure strike-slip mechanism with nodal planes oriented ~E-W and ~N-S. The rupture process, characterized by multiple episodes, propagated predominantly from the south towards the N5°-15°E direction at a velocity around 2.7 km/s along an 870 m fault length in 0.32 seconds. The mainshock's fault plane was identified as the N-S plane, indicating the direction of rupture propagation. Source parameter estimation utilizing the EGF method revealed larger corner frequencies and stress drops compared to individual spectra estimation, attributed to the method’s improved correction for attenuation and site effects, without the need for simplified a priori models. Despite its low magnitude, the 2014 Arzew earthquake provided valuable insights into the region’s seismic behavior, contributing significantly to ground motion predictions. In particular, the study highlights the necessity of accounting for rupture directivity in seismic hazard assessments and mitigation strategies.

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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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