Bulletin KRASEC. Phys. & Math. Sci, 2015, V. 10, №. 1, pp. 39-48. ISSN 2313-0156

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DOI: 10.18454/2313-0156-2015-10-1-39-48

MSC 86A15

HIGH-FREQUENCY ACOUSTIC EMISSION EFFECT

Yu. V. Marapulets

Institute of Cosmophysical Researches and Radio Wave Propagation Far-Eastern Branch, Russian Academy of Sciences, 684034, Kamchatskiy Kray, Paratunka, Mirnaya st., 7, Russia.

E-mail: marpl@ikir.ru.

Complex monitoring of acoustic emission (AE) in the sound frequency range has been carried out in the Kamchatka peninsular since 1999. In the course of the investigation, the existence of acoustic emission effect in sedimentary rocks was detected. It consists in the increase of geoacoustic radiation intensity in the frequency range from hundreds of hertz to the first tens of kilohertz during the growth of rock mass deformation rate. This effect was stably observed at several spaced stations and appears the most vividly at the final stage of earthquake preparation. During the acoustic emission effect, clear anisotropy of geoacoustic radiation directivity occurs which is determined by the source orientation of acoustic oscillations in the stress field of near surface sedimentary rocks.

Key words: acoustic emission, acoustic activity, acoustic emission directivity, deformation rate, high-frequency acoustic emission effect.

 

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Original article submitted: 15.04.2015

Mar

  Marapulets Yuri Valentinovich – Ph.D. (Tech.), Associate Professor, Deputy Director for Science Institute of Space Physics Research and Radio Wave Propagation FEB RAS, Professor of Dep. computer science Vitus Bering Kamchatka State University.

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