希腊中部南埃维亚海岸 2022-2023 年地震序列:左侧走向滑动断层激活和区域地震触发的证据

IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Journal of Seismology Pub Date : 2024-04-01 DOI:10.1007/s10950-024-10211-w
Anna Serpetsidaki, Athanassios Ganas
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引用次数: 0

摘要

2022 年 11 月 29 日,南埃维亚岛(希腊中部)沿岸发生了一次 ML 5.0(Mw 4.8)地震,在此之前还发生了一次 ML 4.7(Mw 4.6)地震。重置余震的模式表明,在地壳浅层(6-11 千米),一个近垂直的断层段被激活,该断层段呈西北-东南走向。我们认为,这两次地震都导致阿尔米罗波塔莫斯村东南约 5 公里处的一条左侧走向滑动盲断层断裂。我们观察到,在两次中等强度的地震发生之前,存在明显的前震活动(N=55 次)。在距离 2022 年 11 月震中 7 千米之后,静应力加载对邻近断层面的影响减弱,静应力降至 +0.1 巴以下。我们进一步探讨了 11 月 29 日事件与 2022 年 12 月下旬中度事件(ML 4.9)之间的触发关系,中度事件发生在埃维亚中部 Psachna 和 Vlahia 地区向西北方向约 60 公里处。我们根据地震发生率的显著变化以及测量到的峰值地速(PGVs)和峰值动态应变,提出了 2022 年 12 月下旬埃维亚中部地震序列可能的延迟动态触发的证据,两者在其地图分布中都表现出局部最大值。延迟触发的原因可能与埃维亚中部/北部著名的地热场以及地震断层的西北-东南走向有关。
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The 2022–2023 seismic sequence onshore South Evia, central Greece: evidence for activation of a left-lateral strike-slip fault and regional triggering of seismicity

On 29 November 2022, an earthquake of ML 5.0 (Mw 4.8) occurred onshore South Evia Island (central Greece) preceded by a ML 4.7 (Mw 4.6) event. The pattern of relocated aftershocks indicates the activation of a single, near-vertical fault segment, oriented NW-SE at shallow crustal depths (6–11 km). We suggest that both events ruptured a blind, left-lateral strike-slip fault, about 5 km southeast of village Almyropotamos. We observed that a clear foreshock activity (N=55 events) existed before the two moderate events. The impact of the static stress loading on neighboring fault planes diminishes after a distance of 7 km from the November 2022 epicenters, where the static stress falls below +0.1 bar. We further explore triggering relationships between the 29 November events and the late December 2022 moderate events (ML 4.9) that occurred about 60 km toward NW in the Psachna and Vlahia regions of central Evia. We present evidence of possible delayed dynamic triggering of the late December 2022 central Evia sequence, based on marked changes in seismicity rates and on measured peak ground velocities (PGVs) and peak dynamic strains, both exhibiting local maxima in their map distributions. The causes of the delayed triggering may be related to the well-known geothermal field in central/north Evia and the NW-SE strike of the seismic fault.

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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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