INFRASOUND OSCILLATIONS CAUSED BY EXTRATROPICAL CYCLONES IN THE SEA OF JAPANE
A brief review of the works of the authors, who performed the analysis of an extensive database microdeformations of the Earth's crust. As a result of the analysis of experimental data, it was revealed that in the general background of oscillations there are microseisms signals in the high-frequency infrasound range (5–12 Hz) during the periods of the passage of powerful tropical cyclones in the Sea of Japan. As a result of the study of the coastal laser strainmeter data, microseisms of oscillations in the upper part of the infrasound range with a distinct dual-frequency component were detected and manifested during the extratropical cyclone development in the northwestern and central part of the Sea of Japan. The methods for measuring microdeformations of the Earth's crust by a stationary two-coordinate coastal laser strainmeter and their processing are described. It is determined that the development of infrasound oscillations does not depend on local meteorological conditions. A brief synoptic analysis of the development of a cyclonic vortex in the Sea of Japan is performed in the article. The detected infrasound signals develop when a certain wind strength is reached along an extended atmospheric front in the Sea of Japan and fade quickly enough during the beginning of rapid displacement of the atmospheric front to the central part of the Sea of Japan with accelerating inflow of cold air masses from the north. The character of the manifestation of infrasound signals during the passage of an extratropical cyclone differs from similar manifestations during a more concentrated impact of tropical cyclones.
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