Infrasound oscillations in the Sea of Japan

Долгих, Г. И.; Долгих, С. Г.; Smirnov, S. V.; Чупин, В. А.; Швец, В. А.; Yakovenko, S. V.

doi:10.1134/s1028334x11110031

Cited by 16 publications

(8 citation statements)

References 2 publications

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“…The Troitsa Bay: 37.8 min (Helmholtz fashion); 12.6; 7.6; 5.4 minutes. The Vityaz Bay was studied in more detail [14,15]. As a result of processing the observational data in [14, p. 99; 15, p.…”

Section: The Numerical Simulation Resultsmentioning

confidence: 99%

“…The promising experimental studies of seiche oscillations in the Far East bays and gulfs should be mentioned. They were carried out by the Pacific Oceanographic Institute and the Institute of Marine Hydrophysics and Geology, Far Eastern Branch of the Russian Academy of Sciences using laser interferometers and laser hydrophones [14][15][16]. In the aforementioned works, the natural periods of a large number of Far Eastern bays were established.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Seiche Oscillations in the Adjacent Bays by the Example of the Sevastopol and the Quarantine Bays

Manilyuk¹,

Lazorenko²,

Фомін³

2020

PhO

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Purpose. The paper is aimed at studying the seiche structure in the adjacent bays' system of real configuration. Methods and Results. The response of the Sevastopol and Quarantine bays (Black Sea) to sea level fluctuations set at the open boundary of the computational domain has been studied. A number of random harmonics within the range of the eigen periods of these bays were used as fluctuations. The ADCIRC numerical model was applied for simulating. The numerical experiments were performed for three ranges obtained from the analytical estimates: 30–52, 8–30 and 1–15 min. The energy-bearing periods of seiche oscillations were revealed for both bays. The mutual influence of these bays was also studied. Conclusions. The above mentioned wave disturbances lead to generation of the seiche oscillations in the bays. For the Sevastopol Bay, their periods are 48, 22, 16, 10 and 6 min, for the Quarantine Bay – 11.4 and 4.8 min. The number of the generated modes is determined by the interval of the wave disturbance periods. The bays have a mutual influence on each other due to the wave energy exchange through their entrances. At that intensity of the eigen modes of the Sevastopol Bay penetrating the Quarantine Bay can exceed intensity of those of the Quarantine Bay. In both bays, the seiches with the largest amplitudes are induced by the disturbances, the periods of which are in the interval 30–52 min.

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Section: The Numerical Simulation Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation of Seiche Oscillations in the Adjacent Bays by the Example of the Sevastopol and the Quarantine Bays

Manilyuk¹,

Lazorenko²,

Фомін³

2020

PhO

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“…Next, let us dwell on the registration of lower frequency oscillations that exist in Vityaz Bay. These oscillations, first of all, include the eigenoscillations of the bay (seiches), which we recorded earlier, with a main period of about 16–18 min [ 16 ]. Seiches, interacting with the bottom, excited the elastic vibrations of the corresponding period, which were recorded by the 52.5 m laser strainmeter installed at Shultz Cape [ 16 ].…”

Section: Processing and Analysis Of The Obtained Experimental Datamentioning

confidence: 92%

“…These oscillations, first of all, include the eigenoscillations of the bay (seiches), which we recorded earlier, with a main period of about 16–18 min [ 16 ]. Seiches, interacting with the bottom, excited the elastic vibrations of the corresponding period, which were recorded by the 52.5 m laser strainmeter installed at Shultz Cape [ 16 ]. To study the capabilities of the ocean-bottom laser seismograph in registering such disturbances, we processed the synchronous record fragments of the ocean-bottom laser seismograph, the laser strainmeter, and the laser meter of hydrosphere pressure variations.…”

Section: Processing and Analysis Of The Obtained Experimental Datamentioning

confidence: 92%

Ocean-Bottom Laser Seismograph

Долгих

Плотников

2022

Sensors

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This paper describes an ocean-bottom laser seismograph, based on the modified laser meter of hydrosphere pressure variations, and designed to record vertical bottom displacements at the place of its location. Its measuring accuracy is about 1 nm, limited by the stability of the laser emission, which can be improved by using more advanced lasers. The purpose of this instrument is to measure the displacements of the seabed’s upper layer in the low-frequency sonic and infrasonic ranges. Theoretically, it can operate in the frequency range from 0 (conditionally) to 1000 Hz; the upper limit is determined by the operating speed of the digital registration system. We demonstrated the capabilities of the ocean-bottom laser seismograph while registering vertical bottom displacements caused by sea wind waves and lower frequency processes—seiches, i.e., eigenoscillations of the bay in which the instrument was installed. Comparison of experimental data of the bottom laser seismograph with the data of the laser hydrosphere pressure variations meter and the velocimeter—installed in close proximity—shows good efficiency of the instrument.

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“…In previous works (Dolgikh et al 2011(Dolgikh et al , 2016Smirnov et al 2018) measurements were made and the specific features of resonant oscillations in some areas within Posyet Bay were studied. We used these results in our study for comparison purposes.…”

Section: Introductionmentioning

confidence: 99%

Resonant oscillations in the western part of the Peter the Great Gulf in the Sea of Japan

et al. 2021

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The research aims to study the resonant properties of the water area of the Peter the Great Gulf, in the Sea of Japan. The coast of the gulf is exposed to the threat of tsunamis due to relatively high seismic activity in the Sea of Japan. On May 26, 1983, a tsunami hit several bays of the gulf with wave heights reaching 5 m. As a response, the coasts were equipped with three sophisticated sea level measuring stations. Field measurements with installation of autonomous pressure gauges were carried out August 18-26, 2016, to study the peculiarities of free surface oscillations in the western part of the Peter the Great Gulf. Spectral analysis of the recorded data and the data obtained from the Posyet automated post of the Russian Tsunami Warning Service showed, in particular, that there were several clearly pronounced peaks at periods of 40, 48, 79 and 89 min. These oscillations are coincident for the Sea of Japan and the studied water area with a wide entrance. A finite-volume numerical model was used to calculate free oscillations in the computational domain covering the Sea of Japan region. We performed model calculations with an irregular triangular grid. This allowed us to describe both the outer water area of the Sea of Japan and separate small-scale relief elements in the water area under study, which are important for the formation of local seiches. Isophases and spatial patterns of several resonant oscillations spectra at 15-105 min periods were obtained for the Peter the Great Gulf area. Model calculations carried out in this work showed an evident spatial structure of resonant oscillations. Such research, including field measurements in adjacent coastal waters, is required to identify and monitor potentially hazardous coastal areas. The amplification of resonant oscillations depends on how effectively the specific atmospheric disturbance generates corresponding eigenmodes of the Sea of Japan. In some bays, the amplitudes of the Sea of Japan eigen oscillations can increase due to resonant properties of coastal water areas, even with a low quality factor. If the amplitudes are large, such a double resonance can lead to a meteorological tsunami.

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Infrasound oscillations in the Sea of Japan

Cited by 16 publications

References 2 publications

Investigation of Seiche Oscillations in the Adjacent Bays by the Example of the Sevastopol and the Quarantine Bays

Investigation of Seiche Oscillations in the Adjacent Bays by the Example of the Sevastopol and the Quarantine Bays

Ocean-Bottom Laser Seismograph

Resonant oscillations in the western part of the Peter the Great Gulf in the Sea of Japan

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