Acoustoseismic wave fields generated by surface seismic vibrators

Ковалевский, В. В.

doi:10.1134/1.2133956

Cited by 6 publications

(3 citation statements)

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“…Seismoacoustic waves in the solid Earth-atmosphere system can be excited by various natural and anthropogenic processes accompanied by intense energy releases. This can be the Earth-surface displacements of different types [1-6], volcanic eruptions [7-9], explosions [10][11][12][13][14], and operation of high-power engineering devices, in particular seismic vibrators [15,16].A practically important problem related to the interaction of different Earth's layers via wave processes is, for example, the excitation of surface waves in the infrasonic frequency range by sources of various physical origin, which act at the interface between the solid Earth and the atmosphere. An increase in the number of studied wave types characterized by different velocities and spatial distributions of the wave fields and the radiated energy offers wider possibilities for remote seismoacoustic monitoring of the sources and the atmospheric parameters.…”

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Radiation of surface Stoneley waves by distributed force sources acting at the solid earth-atmosphere interface

Razin

2007

Radiophys Quantum El

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UDC 534. 222:550.834 Using the Fourier transform, we find an integral solution describing the excitation of seismoacoustic waves in the solid Earth and the atmosphere by time-dependent forces arbitrarily distributed over the interface between the media. The solid Earth and the atmosphere are modeled by an isotropic solid half-space and a homogeneous gaseous half-space, respectively. Depending on the types of the excited surface and bulk waves, classification of the corresponding force distributions is performed. In the case of harmonic sources, an expression for the period-averaged radiated power of the Stoneley wave is obtained. For arbitrary time dependence of the forces, we find an expression describing the the Stoneley-wave energy radiated during the entire time of the source operation.Studying the relations between wave processes in different (solid and liquid) layers of the Earth and in its atmosphere is one of the most important research fields in geophysics. Seismoacoustic waves in the solid Earth-atmosphere system can be excited by various natural and anthropogenic processes accompanied by intense energy releases. This can be the Earth-surface displacements of different types [1-6], volcanic eruptions [7-9], explosions [10][11][12][13][14], and operation of high-power engineering devices, in particular seismic vibrators [15,16].A practically important problem related to the interaction of different Earth's layers via wave processes is, for example, the excitation of surface waves in the infrasonic frequency range by sources of various physical origin, which act at the interface between the solid Earth and the atmosphere. An increase in the number of studied wave types characterized by different velocities and spatial distributions of the wave fields and the radiated energy offers wider possibilities for remote seismoacoustic monitoring of the sources and the atmospheric parameters. In practice, this is necessary for solving a wide range of problems, in particular those related to the modification of the ionospheric communication channels and earthquake forecasting.Although excitation of surface waves has been attracting much attention of researchers (see, for example, [17-28] and references therein), certain problems related to the excitation and propagation of seismoacoustic waves in semi-infinite media are not sufficiently studied. When considering vibrational excitation of elastic waves, the configuration of the sources was already specified at the stage of the problem formulation [29][30][31][32][33]. The problems of calculation of wave fields and the radiated power for arbitrarily distributed surface sources remain open. Moreover, both in the classical work of G. Lamb [34] and in the further development of this approach, the wave excitation is considered for an elastic medium bordering on free space. Under actual conditions, the solid medium borders on a gas or a liquid, and the wave processes in these media affect the formation of both the directional patterns of the sources and the energy distr...

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Radiation of surface Stoneley waves by distributed force sources acting at the solid earth-atmosphere interface

Razin

2007

Radiophys Quantum El

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“…In recent years, topicality of these problems increased in relation to the studies of long-distance (both along the ground surface and towards the upper atmosphere) propagation of infrasound excited by various natural [1] and artificial [2,3] seismic sources, as well as in view of discussing possibilities of acoustic action on the ionosphere [4].…”

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The mean-field method in the problem of acoustic wave propagation in a turbulent atmosphere

Razin

2008

Radiophys Quantum El

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We analyze the problem of acoustic-wave propagation in a turbulent atmosphere using the meanfield method. The equation for the sound pressure is written with accuracy up to terms that are linear with respect to the Mach number of the turbulent air flow. An expression for the attenuation constant of the mean field is obtained. For the turbulence model described by the von Kármán correlation function of fluctuations, the attenuation coefficient of the mean field is numerically studied in detail. It is shown that under typical conditions of the near-ground atmospheric layer, the predominant contribution to scattering of acoustic waves is given by the turbulent motion of the air masses.

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