Vestnik КRAUNC. Fiz.-Mat. Nauki. 2025. vol. 53. no. 4. P. 105 — 117. ISSN 2079-6641

PHYSICS
https://doi.org/10.26117/2079-6641-2025-53-4-105-117
Research Article
Full text in Russian
MSC 86A15

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Measurements of the Vertical Electrotelluric Field Strength in Fault Zones of the Southern Part of Sakhalin

N. S. Stovbun^{\ast}, L. M. Bogomolov

Institute of Marine Geology and Geophysics FEB RAS, 693022, Yuzhno-Sakhalinsk, 1B Nauki st., Russia

Abstract. This study investigates variations of the vertical component of the electrotelluric field (ETF) before and after earthquakes that occurred during 2024-2025. Data from two stations located in the south of Sakhalin Island in the central («Yuzhno-Sakhalinsk») and western («Kolhoznoe») parts were analyzed. Buried metal plates with an area of 0.25 m2 were used as field strength sensors. At the «Kolhoznoe»station, cylindrical lead electrodes were also employed for measurements. Recording of the vertical ETF in the frequency range up to 10 Hz was conducted in quasi-real-time mode from January 2024 to the present. The aim of the study is to test the hypothesis regarding the possible use of variations of the vertical component of the ETF as earthquake precursors. The specific task of this work is to investigate variations of the vertical component of the ETF at two stations in the southern part of Sakhalin Island and to analyze the relationship with local seismicity. Based on the ETF measurements, periods with high levels of vertical field strength, not associated with seasonality, have been identified. Seismic events with magnitudes M≥2, recorded in the south of Sakhalin, occur predominantly during these periods. The obtained results may indicate that variations in the vertical ETF reflect local changes in the seismic regime.

Key words: electrotelluric field, vertical component, data recording, changes in geophysical fields, seismic events, earthquake precursor.

Received: 19.10.2025; Revised: 12.11.2025; Accepted: 14.11.2025; First online: 17.11.2025

For citation. Stovbun N. S., Bogomolov L. M. Measurements of the vertical electrotelluric field strength in fault zones of the southern part of Sakhalin. Vestnik KRAUNC. Fiz.-mat. nauki. 2025, 53: 4, 105-117. EDN: DOQEXX. https://doi.org/10.26117/2079-6641-2025-53-4-105-117.

Funding. The work was completed without the support of funds.

Competing interests. There are no conflicts of interest regarding authorship and publication.

Contribution and Responsibility. All authors contributed to this article. Authors are solely responsible for providing the final version of the article in print. The final version of the manuscript was approved by all authors.

^{\ast}Correspondence: E-mail: n1kolay19971997@yandex.ru

The content is published under the terms of the Creative Commons Attribution 4.0 International License

© Stovbun N. S., Bogomolov L. M., 2025

© Institute of Cosmophysical Research and Radio Wave Propagation, 2025 (original layout, design, compilation)

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Information about the authors

Stovbun Nikolay Sergeevich – Gunior Researcher at the Department of Coastal and Island Electric Power Systems, Institute of Marine Geology and Geophysics FEB RAS, Yuzhno-Sakhalinsk, Russia, ORCID 0009-0004-1927-798X.

Bogomolov Leonid Mikhailovich – Dr. Sci. (Phys. & Math.) Chief Researcher, Director, Institute of Marine Geology and Geophysics FEB RAS, Yuzhno-Sakhalinsk, Russia, 0000-0002-9124-9797.

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