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Glacial and seismic events investigation from a single-station record at Severnaya Zemlya archipelago (Arctic region)

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Abstract

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.

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Data availability

Absolute marks of glaciers of the Severnaya Zemlya archipelago can be accessed from a map form the next website: https://geographyofrussia.com/karta-severnaya-zemlya. Catalogs of N. Laverov Federal Center for Integrated Arctic Research of the Ural Branch of the Russian Academy of Sciences (FECIAR UrB RAS) are available upon official request, http://fciarctic.ru/ing.php?page=contact.

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Acknowledgements

We thank Sergey Kovalev, Head of the Ice Physics Laboratory of the Arctic and Antarctic Research Institute, for his help in organizing the seismic station installation on the Severnaya Zemlya archipelago and its maintenance. We are thankful to VSEGEI personnel for kindly letting us make use of the Arctic tectonic map in digital format. Special thanks go to Vladimir Asming for creating Event Locator program.

Funding

This study was funded by Russian Federation Ministry of Science and Higher Education according to the research project 122011300389–8 and the state task of the IPE RAS.

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Authors and Affiliations

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Contributions

Data processing: all authors. Methodology: Natalia Kapustian and Yana Konechnaya. Visualization: Galina Antonovskaya, Yana Konechnaya, and Ekaterina Morozova. Writing—original draft preparation: Galina Antonovskaya, Natalia Kapustian, and Yana Konechnaya. Writing—review and editing: Galina Antonovskaya and Natalia Kapustian. Funding acquisition: Galina Antonovskaya.

Corresponding author

Correspondence to G. N. Antonovskaya.

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The authors declare no competing interests.

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Highlights

• Using a single permanent seismic station in the Severnaya Zemlya archipelago allows to make progress in the investigation of this poorly studied Arctic territory, in particular to get new information about the glacial and seismic processes.

• Between 2017 and 2022, we detected 46 seismic events with local magnitude from 0.2 to 4.9, 35 for October Revolution Island and 11 for Bolshevik Island. The seismic station temporarily did not work in 2019 and 2021. Using spectral and polarization analysis, we were able to divide these events into two groups as shallow earthquakes and glacier events. Also, we show that October Revolution Island earthquakes induced icequakes in ice domes.

• We recorded the thousands of visible pulses greater than noise. Their number correlates to the air temperature sharp change and occurs most often in wintertime. The nature of such events is related to sea or lake ice sheet cracking.

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Antonovskaya, G.N., Kapustian, N.K., Konechnaya, Y.V. et al. Glacial and seismic events investigation from a single-station record at Severnaya Zemlya archipelago (Arctic region). J Seismol (2024). https://doi.org/10.1007/s10950-024-10208-5

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