G. N. Antonovskaya, N. K. Kapustian, Ya V. Konechnaya, E. R. Morozova
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We show the presence of icequakes induced by local crustal events; their epicenters confined to the ice domes edges. Spatio-temporal sequence and the rate of events migration show that the glacial events are a result of the defusing deformations process in the glaciers caused by the impact of shallow tectonic earthquakes. Thousands of pulsed and high-frequency micro-oscillations associate with the sea ice sheet or lake ice. The temporal variation of events’ number and energy per day correlates with air temperature temporal variations. Moreover, there is a sharp increase in the number of pulses with sharp temperature changes. The greatest activity of this pulsed events is in winter and especially in March, connected with ice surface destruction. 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引用次数: 0
摘要
新的永久性地震台 SVZ 开始在北极(塞维利亚-泽姆利亚群岛,布尔什维克岛)工作,我们讨论了当地地震研究的初步结果。我们已经处理了 2017-2022 年的 46 次当地地震事件。使用单个地震传感器进行数据处理非常困难,但利用波形和 P 波、S 波及面波的频谱-时间分析,可以将浅层地震与冰川事件区分开来。我们区分了两种类型的冰川地震--冰川相关事件和脉冲。地震背景噪声的增加与夏季冰川过程有关。通过数据处理可以获得当地地震的主要特征,即冰川过程与地壳地震的相互联系。我们显示了由当地地壳事件诱发的冰震的存在;其震中局限于冰穹边缘。事件迁移的时空序列和速度表明,冰川事件是浅构造地震影响下冰川变形过程的结果。成千上万的脉冲式高频微振荡与海冰层或湖冰有关。每天发生的事件数量和能量的时间变化与气温的时间变化相关。此外,随着气温的急剧变化,脉冲的数量也会急剧增加。这种脉冲事件最活跃的时期是冬季,尤其是三月,与冰面破坏有关。在无法进行网络部署的情况下,即使是一个地震台站也可以获得有关冰川和地震过程的有用信息。
Glacial and seismic events investigation from a single-station record at Severnaya Zemlya archipelago (Arctic region)
The new permanent seismic station SVZ started working in Arctic (Severnaya Zemlya archipelago, Bolshevik Island), we discuss the first results of the local seismicity study. We have processed 46 local seismic events for 2017–2022. Data processing using a single seismic sensor is difficult, but using waveforms and spectral-temporal analysis of P, S, and surface waves, it is possible to separate shallow earthquakes from glacial events. We distinguish two types of icequakes—glacier-related events and pulses. An increase in seismic background noise is related to processes of glacial nature in summertime. Data processing allows to obtain the main peculiarities of local seismicity, i.e., mutual connection of glacial processes and crustal seismicity. We show the presence of icequakes induced by local crustal events; their epicenters confined to the ice domes edges. Spatio-temporal sequence and the rate of events migration show that the glacial events are a result of the defusing deformations process in the glaciers caused by the impact of shallow tectonic earthquakes. Thousands of pulsed and high-frequency micro-oscillations associate with the sea ice sheet or lake ice. The temporal variation of events’ number and energy per day correlates with air temperature temporal variations. Moreover, there is a sharp increase in the number of pulses with sharp temperature changes. The greatest activity of this pulsed events is in winter and especially in March, connected with ice surface destruction. In case a network deployment is not feasible, even a single seismic station allows to get a useful information about the glacial and seismic processes.
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.