伊朗南部 2021 年 11 月 Fin 双联地震的震源分析和指向性:挑战与发现

IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Journal of Seismology Pub Date : 2024-08-21 DOI:10.1007/s10950-024-10237-0
Elham Sabouri, Zaher Hossein Shomali, Mehrdad Pakzad
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引用次数: 0

摘要

研究双发或多发地震序列的震源特征给地震学带来了巨大挑战,尤其是在地震发生间隔时间很短的情况下。2021 年 11 月 14 日,伊朗南部芬市附近发生了一次双发地震(Mw 6.0 和 Mw 6.1),间隔时间不到两分钟,相距 10 公里。我们采用了运动波形反演(KIWI)程序来确定这些事件的点源和扩展源参数,并使用多步反演方法来获得稳定的解决方案。我们的分析凸显了地震的指向性:第一个事件表现出双边指向性,造成的断裂区域到达地表,而第二个事件表现出单边向西指向性,在不同站点观测到的波形振幅差异也证明了这一点。这种指向性分析在地震灾害研究中起着至关重要的作用。我们对 Fin 地区最近发生的这些双发地震震源参数的研究结果与该地区的地质趋势和断层模式非常吻合。然而,由于波形的复杂性,检索第二次地震的主断层面具有挑战性。力矩张量分解显示,第二次地震有大量非双偶成分,这表明分析双偶事件具有内在的复杂性。这项研究强调了精确的波形分析和强大的反演技术在理解复杂地震事件中的关键作用。
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Seismic source analysis and directivity of the November 2021 Fin doublet earthquake in southern Iran: challenges and findings

Studying the source characteristics of doublet or multiple earthquake sequences presents significant challenges in seismology, especially with short time intervals between events. On November 14, 2021, a doublet earthquake (Mw 6.0 and Mw 6.1) occurred near Fin city, southern Iran, within a span of less than two minutes and 10 km apart. We employed the Kinematic Waveform Inversion (KIWI) procedure to determine the point and extended source parameters of these events, using a multistep inversion approach for stable solutions. Our analysis highlighted the directivity of the earthquakes: the first event exhibited bilateral directivity, causing a rupture area that reached the surface, while the second event showed unilateral westward directivity, supported by waveform amplitude differences observed at various stations. This directivity analysis plays an essential role in seismic hazard studies. Our findings regarding the source parameters of these recent doublet earthquakes in the Fin region align well with regional geological trends and fault patterns. However, retrieving the main fault plane for the second earthquake was challenging due to the complexities of the waveform. Moment tensor decomposition revealed significant non-double-couple components for the second event, indicating the complexity inherent in analyzing doublet events. This study underscores the critical role of precise waveform analysis and robust inversion techniques in understanding complex seismic events.

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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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