Vestnik КRAUNC. Fiz.-Mat. Nauki. 2025. vol. 51. no. 2. P. 102 – 121. ISSN 2079-6641

INSTRUMENTS AND METHODS OF MEASUREMENT
https://doi.org/10.26117/2079-6641-2025-51-2-102-121
Research Article
Full text in Russian
MSC 86A17

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Application of Spatially Separated Laser Strainmeters for Recording Seismic-Strain Oscillations of the Earth’s Surface

I. A. Larionov¹^{\ast}, D. V. Aleksandrov², M. N. Dubrov², I. S. Eremin², D. S. Kalenov²

¹Institute of Cosmophysical Research and Radio Wave Propagation FEB RAS, 684034, Kamchatsky Kray, Paratunka, Mirnaya st., 7, Russia
²Kotelnikov Institute of Radioengineering and Electronics, Russian Academy of Sciences, Fryazino Branch, 141190, Moscow region, Fryazino, Russia

Abstract. The design and installation features of laser strainmeters at «Karymshina» (Kamchatka) and «Fryazino» (Moscow Region) observation points are presented. The main technical characteristics of the strainmeters are confirmed by recording real geophysical processes. The used instruments and methods provide the resolution of \epsilon \sim (5-6)·10^{−11} to measure deformations on bases of 18 – 300 m in length. Based on the results of synchronous observations of microseismic deformations in the frequency band of 0.4 – 4 Hz, which was carried out in the period preceding the destructive 06.02.2023 M_w=7.8 earthquake in Turkey, phenomena of synchronization and restructuring of the spectral composition of the recorded high-frequency microseisms were noted. As a result of the analysis of the deformation-baric processes that accompanied two other strong M_w=7.8 and M_w=7.7 earthquakes, unusual ultra-long-period 10 – 40-min oscillations with an amplitude approximately an order of magnitude greater than the amplitude of L and R seismic waves, and with a characteristic 7 – 8 min. time delay at point «Karymshina» relative to point «Fryazino» were revealed. The results of the conducted research will be useful in developing methods for preventing natural disasters – earthquakes, tsunamis, hurricanes.

Key words: laser interferometers, deformations, microseisms, earthquakes, atmosphere, pressure.

Received: 16.04.2025; Revised: 11.06.2025; Accepted: 16.06.2025; First online: 19.09.2025

For citation. Larionov I. A., Aleksandrov D. V., Dubrov M. N., Eremin I. S., Kalenov D. S. Application of spatially separated laser strainmeters for recording seismic-strain oscillations of the Earth’s surface. Vestnik KRAUNC. Fiz.-mat. nauki. 2025, 51: 2, 102-121. EDN: XCEDES. https://doi.org/10.26117/2079-6641-2025-51-2-102-121.

Funding. The work was supported by IKIR FEB RAS State Task (subject registration №124012300245-2) and IRE RAS State Task (subject registration №075-00395-25-00)

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: igor@ikir.ru

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

© Larionov I. A., Aleksandrov D. V., Dubrov M. N., Eremin I. S., Kalenov D. S., 2025

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

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Information about the authors

Larionov Igor Alexandrovich – PhD (Phys. & Math.), Leading Researcher, Institute of Cosmophysical Research and Radio Wave Propagation, Far Eastern Branch of the Russian Academy of Sciences, Paratunka, Kamchatka, Russia, ORCID 0000-0002-9369-7497

Alexandrov Dmitry Valerievich – PhD (Phys. & Math.), Senior Researcher, V.A. Kotelnikov Institute of Radio Engineering and Electronics of the Russian Academy of Sciences, Fryazino Branch, Fryazino, Moscow Region, Russia, ORCID 0000-0001-6955-566X.

Dubrov Mstislav Nikolaevich – PhD (Phys. & Math.), Leading Researcher, V.A. Kotelnikov Institute of Radio Engineering and Electronics of the Russian Academy of Sciences, Fryazino Branch, Fryazino, Moscow Region, Russia, ORCID 0000-0002-0549-4340.

Eremin Ilya Stanislavovich – Researcher, V.A. Kotelnikov Institute of Radio Engineering and Electronics of the Russian Academy of Sciences, Fryazino Branch, Fryazino, Moscow Region, Russia, ORCID 0009-0000-9101-8633.

Kalenov Dmitry Sergeevich – Senior Researcher, V.A. Kotelnikov
Institute of Radio Engineering and Electronics of the Russian Academy of Sciences, Fryazino Branch, Fryazino, Moscow Region, Russia, ORCID 0009-0008-1872-6084.

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