Ionospheric effects of the acoustic wave above the epicenter of an industrial explosion

Drobzhev, V. I.; Zheleznyakov, E. V.; Idrisov, I. K.; Kaliev, M. Z.; Казаков, В. В.; Krasnov, V. M.; Pelenitsyn, G. M.; Savel’ev, V. L.; Salikov, N. M.; Shingarkin, A. D.

doi:10.1007/bf01035385

Cited by 9 publications

(9 citation statements)

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confidence: 99%

“…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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“…Usually these disturbances appeared with a (15-18) min time delay, at an exit onto the earth's surface of the radioactive components of the explosion, and of the large masses of natural radon and thorium ejected by the seismic influence of the explosion on the rock. It is interesting to note that at a 260 t TNT ground surface fugas explosion in 1981 there was not detected any secondary effect in the Doppler shift record [44]. For comparison, it can be mentioned the results of a modern analysis of the consequences of an underground nuclear explosion on February 12, 2013 (Pungery, Northern Korea) [26].…”

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confidence: 98%

Monitoring of Gamma Radiation Prior to Earthquakes at a Study of Lithosphere-Atmosphere-Ionosphere Coupling in Northern Tien Shan

Salikhov,

Shepetov,

Pak

et al. 2022

Preprint

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Monitoring of radiation background in the near-surface atmosphere and of gamma rays, geoacoustic emission, and temperature in a borehole at 40 m depth, as well as Doppler sounding on a low-inclined radio pass proceed at the Tien Shan mountain station (3340 m a.s.l.) in Northern Tien Shan with common goal to search for seismogenic effects preceding earthquake. The flux of gamma rays in the borehole varies negligibly between the days, and it is not influenced by precipitations. Characteristic bay-like drops of the gamma ray flux were found (2-8) days before the M5.0-M6.2 earthquakes. In a M4.2 earthquake event with the 5.3 km epicenter distance anomalies were detected (7-10) days before the earthquake in variation of the gamma ray flux, geoacoustic emission, and temperature. Simultaneously with gamma rays, a disturbance was detected in the Doppler shift of the ionospheric signal. Similarly, ionosphere disturbances triggered by the growth of radioactivity in the near-surface atmosphere were found at retrospective analysis of the Doppler shift data acquired after underground nuclear explosions at the Semipalatinsk testing site. This effect is considered from the viewpoint of the lithosphere-atmosphere-ionosphere coupling concept.

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“…Seismoacoustic waves in the Earth-atmosphere and Earth-ocean-atmosphere systems can be excited during different natural or anthropogenic processes accompanied by an intense energy release. It has been experimentally proved that acoustic waves excited by the near-surface sources can be launched to the ionosphere [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Excitation of Rayleigh and Stoneley surface acoustic waves by distributed seismic sources

Razin

2010

Radiophys Quantum El

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UDC 534.232+550.834Using the integral Fourier-transform technique, we obtain a solution in integral form to the problem of excitation of elastic waves in a homogeneous isotropic solid half-space and the bordering homogeneous gas by the time-dependent forces which are arbitrarily distributed in a solid over the plane parallel to the interface of the media. Different configurations of the force sources are analyzed from the viewpoint of excitation of different types of seismoacoustic waves. Expressions for the time-averaged radiated powers of the Stoneley wave at the gas-solid interface and the Rayleigh wave at the solid-vacuum interface as well as analytical expressions for the Rayleighwave displacements, which are valid for large distances from the source, are obtained for the harmonic dependence of forces on time. Excitation of a Rayleigh wave by the point sources oriented vertically, i.e., along the normal to the surface of elastic half-space, and horizontally, i.e., parallel to this surface, is analyzed in detail. Analytical expressions for the Rayleigh-wave radiated power are obtained. The dependences of these powers on the source orientation and depth are derived. It is shown that the Rayleigh-wave radiated power decreases with distance between the point of the force application and the boundary and turns to zero for a source depth of about 17.5% of the wavelength of the transverse wave in the case of a horizontally oriented subsurface source and a medium with identical Lamé parameters λ and μ. This power increases and reaches a relative maximum when the source depth becomes equal to about 42.4% of the wavelength of the transverse wave and then exponentially falls off as the source depth increases. This maximum is about 5.5% of the surface-source radiated power.

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Ionospheric effects of the acoustic wave above the epicenter of an industrial explosion

Cited by 9 publications

References 1 publication

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

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

Monitoring of Gamma Radiation Prior to Earthquakes at a Study of Lithosphere-Atmosphere-Ionosphere Coupling in Northern Tien Shan

Excitation of Rayleigh and Stoneley surface acoustic waves by distributed seismic sources

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