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Solar-Terrestrial Physics
UDC
551.510.535

DETECTING GROUPS OF EIGENFREQUENCIES OF VERTICAL STANDING WAVES IN THE LAYERED STRUCTURE OF THE EARTH’S CRUST Detecting groups of eigenfrequencies of vertical standing waves in the layered structure of the Earth’s crust

Published in Solar-Terrestrial Physics · Pages 97–103 · Rubric: Results of current research
DOI: https://doi.org/10.12737/stp-114202510
Received: 11.04.2025 Accepted: 28.08.2025 Published: 10.12.2025 Language of publication: ENG
Authors
AN
Andrey Polyakov
BA
Battuulai Tsegmed
ABSTRACT
Using a novel signal processing technique — the method of correlation function of amplitude and phase fluctuations (APCF) — we have obtained the first spectra of equidistant frequency (EF) groups in records of background seismic oscillations. This method has previously been successfully applied to the analysis of resonant oscillations in Earth’s magnetosphere-ionosphere system. In the case of seismic oscillations, all peaks in the EF spectrum can be divided into two groups corresponding to eigenfrequencies of vertical standing waves of P and S types in the Earth’s interior. The upper turning point of these waves lies at the free upper boundary of the Earth’s crust, whereas the lower turning point is located at the boundaries between subsurface layers. We demonstrate that this signal processing technique can serve as a new method for probing the layered structure of the Earth’s subsurface. Specifically, it enables the determination of the depth and thickness of each layer, as well as the estimation of elastic properties (such as Poisson’s ratio) of the geological material composing the layer. The findings have revealed that at the depth of ~2.7 km there are two layers of different solid substance 58 m and 140 m thick with Poisson’s ratios of 0.231 and 0.187.
KEYWORDS
signal processing technique, equidistant frequencies, eigenfrequencies, P- and S-type elastic waves
Funding
The work was financially supported by the Ministry of Science and Higher Education of the Russian Federation
Text References
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Geliy Zherebtsov
Editor-in-Chief
Geliy Zherebtsov
solater@iszf.irk.ru
Aleksandr Stepanov
Deputy Editor-in-Chief
Aleksandr Stepanov
stepanov@gaoran.ru
Alexander Potapov
Deputy Editor-in-Chief
Alexander Potapov
potapov@iszf.irk.ru
Natalia Polyushkina
Executive Secretary of Editorial Board
Natalia Polyushkina
npol@iszf.irk.ru
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