Vestnik КRAUNC. Fiz.-Mat. nauki. 2023. vol. 45. no. 4. P. 109-121. ISSN 2079-6641

Research Article
Full text in Russian
MSC 94A12

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Method for Estimation of Near-Surface Sedimentary Rock State Based on the Results of Observations of Geoacoustic Emission Dynamic Characteristics

Yu. I. Senkevich, M. A. Mishchenko^\ast

Institute for Cosmophysical Research and Radio Propagation FEB RAS, 684034, v. Paratunka, Mirnaya st., 7, Russia

Abstract. The technology of observations of the near-surface sedimentary rock state is developed and realized in IKIR FEB RAS since 2003. It is based on the results of geoacoustic emission signal processing and analysis. The relation between the degree of stress-strain state of sedimentary rocks and pulse flux intensity in geoacoustic emission signal has been discovered before. Continuous measurements of geoacoustic emission pulse flux intensity, pulse form and their distributions are carried out. The final aim of the investigations is the development of methods for analysis of the observed anomalies of geoacoutic emission signal characteristics to detect their relation with the probability of earthquake occurrences. At the current stage of the research, a probabilistic model of GAE signal formation in the near-surface sedimentary rocks at the reception site is presented. The model makes it possible to describe the changes in the nearsurface sedimentary rocks state based on the results of estimations of the changeability of pulse duration distribution pattern and that of their amplitudes taking into account the update of the model for signal formation at the receiving device input. The results of computational experiments with natural signals of geoacoustic emission, confirming the changes made in the model of GAE signal formation. Implementation of the research results into the observation practice makes it possible to improve the quality of real-time observations of the changes in the near-surface sedimentary rock state without expensive and laborious methods of direct measurements. Time changes in the following characteristics of GAE are considered: changes in pulse duration and diversity of their amplitude-phase modulation in a moving time window of different duration. The result is achieved by visual representation of GAE signal characteristics in the form of three-dimensional images of statistical distributions of pulse duration and amplitudes mapped on a graph at defined time intervals. Such a representation allows one to see the occurring anomalies in GAE signal characteristics parameters and to classify the observed anomalies. In the future, that will allow to connect the detected anomalies with certain seismic events and to distinguish them from the anomalies occurring under climatic and seasonal factors impact.

Key words: condition monitoring, near-surface rocks, dynamic characteristics, geoacoustic emission.

Received: 02.11.2023; Revised: 04.12.2023; Accepted: 05.12.2023; First online: 15.12.2023

For citation. Senkevich Yu. I., Mishchenko M. A. Method for estimation of near-surface sedimentary rock state based on the results of observations of geoacoustic emission dynamic characteristics . Vestnik KRAUNC. Fiz.-mat. nauki. 2023, 45:4, 109-121. EDN: UMHNFL.

Funding. The research was carried out in the framework of realization of the State Task АААА-А21-121011290003-0

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.

^\astCorrespondence: E-mail:

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

© Senkevich Yu. I., Mishchenko M. A., 2023

© Institute of Cosmophysical Research and Radio Wave Propagation, 2023 (original layout, design, compilation)


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Information about authors

Senkevich Yuri Igorevich – D. Sci. (Tech.), Docent, Leading Researcher, Laboratory of Acoustic Research, Institute of Cosmophysical Research and Radio Wave Propagation FEB RAS, Paratunka, Russia, ORCID 0000-0003-0875-6112.

Mishchenko Mikhail Aleksandrovich – PhD (Phys. & Math.), Senior Researcher, Laboratory of Acoustic Research, Institute of Cosmophysical Research and Radio Wave Propagation FEB RAS, Paratunka, Russia, ORCID 0000-0003-1958-5830.