2020 - 2021 年佩特里尼亚(克罗地亚)地震序列的时空特性

IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Journal of Seismology Pub Date : 2024-07-01 DOI:10.1007/s10950-024-10228-1
Eirini Sardeli, Georgios Michas, Kyriaki Pavlou, Davide Zaccagnino, Filippos Vallianatos
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引用次数: 0

摘要

佩特里尼亚地震序列始于 2020 年 12 月 28 日,在该地区发生了一次破坏性的 ML 6.2 主震,在此之前发生了一次 ML 5.08 前震,此前该地区长期处于相对地震静止状态。在 Petrinja 地震序列的前六个月中,记录了近 14,000 次地震事件。在本研究中,我们使用基于密度的聚类算法 DBSCAN,根据地震事件的空间集中度对其进行了分类。我们确定了四个主要聚类,并利用非广延性统计物理学(NESP)的概念分析了它们的时空特性。该框架依赖于查里斯熵(Sq),描述了复杂系统的缩放行为。在此框架下,我们研究了事件间时间(T)和距离(D)分布,分别提供了 qT 和 qD熵参数。此外,我们还根据片段-不稳定性模型研究了频率-幅度分布,从而确定了非广延性参数 qM。分析结果表明,利用 NESP 可以有效地再现 Petrinja 地震序列的统计特性。此外,还估算了共震静态库仑应力变化,表明地震群的地震事件可能是由复杂断层系统的(再)激活引起的。此外,还估算了每个空间集群的有效静应力降。最后,使用超统计方法讨论了地震演变的时间模式,表明 Petrinja 地震群的时间进程受极少数自由度的控制,突出了每个地震群的时空组织。
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Spatiotemporal properties of the 2020 – 2021 Petrinja (Croatia) earthquake sequence

The Petrinja earthquake sequence started on December 28, 2020, with a destructive ML 6.2 mainshock occurring in the area, preceded by a ML 5.08 foreshock, following a long period of relative seismic quiescence. Over the first six months of the Petrinja earthquake sequence, almost 14,000 events were recorded. In the present work, we separated seismic events based on their spatial concentration using a density-based clustering algorithm, DBSCAN. We identified four main clusters and analyzed their spatiotemporal properties using the notions of Non-Extensive Statistical Physics (NESP). This framework, which relies on Tsallis entropy (Sq), describes the scaling behavior of complex systems. In this frame, we investigated the inter-event time (T) and distance (D) distributions, providing the qT and qD entropic parameters, respectively. Additionally, we studied the frequency–magnitude distributions in terms of the fragment–asperity model, leading to the determination of the non-extensive parameter qM. The results of the analysis suggest that the statistical properties of the Petrinja earthquake sequence can be effectively reproduced utilizing NESP. Furthermore, the coseismic static Coulomb stress changes were estimated, indicating that the clusters’ seismic events may have resulted from a complex fault system's (re)activation. In addition, the effective static stress drop was estimated for each spatial cluster. Lastly, the temporal patterns of the earthquake evolution are discussed using the superstatistics approach, indicating that the temporal progression of the Petrinja earthquake clusters is governed by a very low number of degrees of freedom, highlighting the spatiotemporal organization of each cluster.

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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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