The influence of earthquake source complexity on frequency-dependent radiation patterns by modifying distance-dependent properties

IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Journal of Seismology Pub Date : 2024-03-09 DOI:10.1007/s10950-024-10200-z
Hongpeng Zhao, Dengke He, Jiulong Cheng
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Abstract

The double-couple model of the earthquake source has been proven remarkably successful in explaining the radiation pattern in the low-frequency wavefield. However, the radiation pattern is distorted in the high-frequency wavefield. The frequency dependence of the radiation pattern is often interpreted as the path effects. The impact of earthquake sources on radiation patterns is uncertain. In our study, based on the fact that P waves vibrate along the radial direction and S waves vibrate along the transverse direction, the path effects modified model of radiation pattern is proposed based on the optimal ratio coefficient by measuring radial-to-transverse spectral ratios at multiple frequency ranges. Then, we found that the correlation coefficient decreases with the increase of frequency but remains stable with the increase of distance. This means the complexity of the earthquake source can distort the wavefield at higher frequencies and drive variability in the ground motion.

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通过改变与距离相关的特性,研究震源复杂性对频率相关辐射模式的影响
事实证明,地震源的双耦合模型在解释低频波场的辐射模式方面非常成功。然而,辐射模式在高频波场中却被扭曲了。辐射模式的频率依赖性通常被解释为路径效应。地震源对辐射模式的影响尚不确定。在我们的研究中,基于 P 波沿径向振动、S 波沿横向振动的事实,通过测量多个频率范围内的径向与横向频谱比,提出了基于最佳比值系数的路径效应修正辐射模式模型。然后,我们发现相关系数随频率的增加而减小,但随距离的增加而保持稳定。这说明地震源的复杂性会扭曲较高频率的波场,导致地面运动的变化。
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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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