确定小震级地震焦点机制的反演技术:利用巴基斯坦 Burewala 地震($$M_w$$ $$\sim $$4)进行的比较研究

IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Journal of Seismology Pub Date : 2023-12-28 DOI:10.1007/s10950-023-10186-0
Sadia Sabahat, Mohammad Tahir, Fatima Munir, Bilal Saif, Muhammad Tahir Iqbal, Javed Iqbal, Talat Iqbal
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引用次数: 0

摘要

由于网络稀疏、速度模型的可用性有限以及缺乏合适的方法,小震级地震的焦点机制可能具有挑战性。在这项研究中,使用了三种技术来确定 2022 年 3 月 18 日发生在巴基斯坦的 Burewala 地震(\(M_w\) \(\sim\) 4)的焦点机制。全波形反演对当地和区域速度模型产生了不同的结果。虽然区域速度模型显示出更好的波形拟合,但得到的推力机制解与初动极性不匹配。因此,采用了极性解的循环扫描来结合极性和波形,但由于站点覆盖率低,解的结果并不可靠。因此,采用了波形包络反演技术,该技术对速度模型的敏感性较低,因此可用于稀疏网络。针对局部和区域速度模型,获得了其机理(即带有少量走向滑动成分的正断层)。得到的解与基于本地速度模型的波形反演结果一致。因此,包络反演被认为是一种更适合分析小震的技术。
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Inversion techniques for focal mechanism determination of small-magnitude earthquakes: a comparative study using the Burewala earthquake (\(M_w\) \(\sim \) 4) in Pakistan

The focal mechanisms of small-magnitude earthquakes can be challenging due to sparse networks, limited availability of velocity models, and a lack of suitable approaches. In this study, three techniques were used to determine the focal mechanism of the Burewala earthquake (\(M_w\) \(\sim \) 4) in Pakistan, which occurred on March 18, 2022. Full waveform inversion yielded different results for the local and regional velocity models. Although the regional velocity models showed a better waveform fit, the thrust mechanism solutions obtained did not match first-motion polarities. Therefore, cyclic scanning of polarity solutions was employed to combine polarities and waveforms, but the solutions were unreliable due to poor station coverage. Therefore, the inversion of waveform envelope technique was used, which is less sensitive to velocity models; hence, it can be used for sparse networks. The mechanism (i.e., normal faulting with a minor strike-slip component) was obtained for local and regional velocity models. The obtained solutions were consistent with the waveform inversion results based on the local velocity model. Thus, envelope inversion is deemed a more suitable technique for analyzing small-magnitude earthquakes.

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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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