Simultaneous response of high-frequency geoacoustic emission and atmospheric electric field to strain of near-surface sedimentary rocks

Marapulets, Yu. V.; Rulenko, O. P.; Larionov, I. A.; Mishchenko, Mikhail

doi:10.1134/s1028334x11090285

Cited by 5 publications

(5 citation statements)

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“…The increase in the velocity of their extension leads to greater opening of the pores and an extension of frac tures that is accompanied by intensified release of radon and thoron [15], an increase in their contents in the subsurface ground layer, and their significant emis sion into the atmosphere. As a result, the origination of the negative space charge in calm weather and its further destruction will cause a baylike decrease in the atmospheric electric field near the ground with syn chronous relative microshifting of the rock fragments and generation of anomalous geoacoustic signals [4,5]. Thus, the increase in the radon and thoron content in the surface ground layer should be accompanied by a decrease in the atmospheric electric field, which will occur synchronously with a disturbance of the high frequency geoacoustic emission.…”

Section: The Reason For Synchronous Disturbances In the Atmospheric Ementioning

confidence: 95%

“…In the Kamchatka experiments, the subsurface rocks in the measurement points represent low strength fractured-porous sedimentary rocks [2][3][4][5]. The increase in the velocity of their extension leads to greater opening of the pores and an extension of frac tures that is accompanied by intensified release of radon and thoron [15], an increase in their contents in the subsurface ground layer, and their significant emis sion into the atmosphere.…”

Section: The Reason For Synchronous Disturbances In the Atmospheric Ementioning

confidence: 99%

“…No consideration has been given to the role of thoron in the formation of aeroions, although it is rather real [5]. The negative space charge in the air remains also under a weak wind, but the scale of its vertical distribution increases and the density decreases [6].…”

Section: The Reason For Synchronous Disturbances In the Atmospheric Ementioning

confidence: 99%

“…The disturbances of the high frequency geoacoustic emis sion prior to the earthquakes are related to active deformation of the subsurface sedimentary rocks at the measurement point [4]. Synchronous disturbances of V' and P S are registered at increase in the velocity of extension of these rocks, the deformation of which was two orders of magnitude higher than the tidal ones [5].…”

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The reason for synchronous disturbances in the atmospheric electric field and high-frequency geoacoustic emission during the seismotectonic process

2015

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The boundary between the lithosphere and the atmosphere is characterized by specific effects related to the interaction and transformation of various geo physical fields. The persistent various scale variations of these fields reflect the complex relations between their sources and also the properties of solid and gas eous media [1]. These effects are most intensely man ifested in seismically active regions, where permanent seismotectonic process is accompanied by stronger deformation of the rocks.The atmospheric electric field and the high fre quency geoacoustic emission are measured in air near the ground and in the surface rocks. The link between disturbances of these geophysical fields various in ori gins is found in Kamchatka at calm weather free of interfered meteofactors. This link is manifested in a baylike decrease in the gradient of potential V' of the electric field (up to the change of the sign) under a sharp and significant increase in the acoustic pressure P S in the kHz frequency range. Such disturbances of V ' and P S were registered in seismically calm periods and during the final stage prior to the earthquake, which indicates their seismotectonic origin [2,3]. The disturbances of the high frequency geoacoustic emis sion prior to the earthquakes are related to active deformation of the subsurface sedimentary rocks at the measurement point [4]. Synchronous disturbances of V' and P S are registered at increase in the velocity of extension of these rocks, the deformation of which was two orders of magnitude higher than the tidal ones [5].The reason for synchronous disturbances of the atmospheric electric field and the high frequency geoacoustic emission in the seismoactive region dur ing calm weather is unclear. It is important for under standing the lithospheric effect on the atmosphere during the seismotectonic process and also the response of the electricity of the ground atmospheric layer. Below we explain the reasons for the synchro nous origin of these disturbances.In good weather, in spite of the electrode effect, a negative electric charge may originate in the air layer from decimeters to a few meters thick near the ground [6][7][8]. The average density of this charge is about -700 pC/m 3 [9], and the highest density may attain -1200 [10] and even -3200 pC/m 3 [11], which is comparable with that of the space charge in stormy clouds (300-3000 pC/m 3 ) [12]. The normal atmo spheric electric field decreases near such a strong neg ative charge or even changes its sign [10,11]. These values, however, are measured in aseismic regions. In Kamchatka, a negative space charge was recorded prior to an earthquake with magnitude 6.0 at a dis Abstract-The atmospheric electric field, the geoacoustic emission at frequencies of 0.7-2.0 kHz at three points, the volumetric activity of radon and thoron in the surface ground layer, the atmospheric pressure, the velocity of wind, and the intensity of rain were synchronously measured from August 27 to October 17, 2012, at the interception zone of various faults 41...

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Section: The Reason For Synchronous Disturbances In the Atmospheric Ementioning

confidence: 95%

Section: The Reason For Synchronous Disturbances In the Atmospheric Ementioning

confidence: 99%

Section: The Reason For Synchronous Disturbances In the Atmospheric Ementioning

confidence: 99%

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confidence: 99%

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The reason for synchronous disturbances in the atmospheric electric field and high-frequency geoacoustic emission during the seismotectonic process

2015

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“…In seismically active regions, where the continuous seismotectonic process is accompanied by more intensive deformations of rock, anomalous disturbances of different geophysical fields are observed during earthquake preparation and might be considered as precursors (Adushkin and Spivak, 2012). Studies in Kamchatka (Larionov et al, 2014;Rulenko et al, 2014;Marapulets et al, 2011) showed that pre-seismic anomalous fluctuations in acoustic, atmospheric-electric and emanation fields occur as the result of relative microdisplacements of nearsurface sedimentary rock fragments.…”

Section: Introductionmentioning

confidence: 99%

Fractal analysis of seismoacoustic signals of near-surface sedimentary rocks in Kamchatka

Imashev

Mishchenko

2020

Geofizika (Online)

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We studied, by the mono-and multifractal detrended fluctuation analysis (DFA), time fluctuations in the dynamics of seismoacoustic data, recorded in Karymshina site, which is located in a seismic area of Kamchatka. We took a series of seismoacoustic responses to the regional seismic events with the magnitudes M > 4 for the period 2017-2018. The series was divided into three groups (high, medium and low) based on the amplitude of recorded seismoacoustic response. Background noise segments of the signals demonstrated monofractal behavior similar to white noise by almost constant values of generalized Hurst exponent H q ≈0.5 and very small width of the multifractal spectrum Δa ≈ 0.1. Analysis of the high amplitude seismoacoustic signals with clear P-, S-and coda waves showed that P-and S-waves demonstrate wider multifractal spectrum (Δa P = 0.37, Δa S = 0.35) and range of generalized Hurst exponents H q in comparison with coda wave, characterized by almost constant H q and minimal width of multifractal spectrum (Δa CODA = 0.13). We showed that the properties of the multifractal spectrum could be used in detection of seismic wave arrival, estimation its duration and separation of P-, S-and coda waves. Application of the monofractal DFA in a sliding window showed that the acoustic signal transits from monofractal and uncorrelated background noise (Hurst exponent equals to 0.5) into the long-range dependent state during seismic waves arrival, that is helpful in analysis of the signals, particularly in case of low amplitude acoustic responses, usually demonstrating an unclear waveform. Difference in multifractal spectrum width between the original low amplitude signal and its surrogates, obtained by random shuffling showed that the multifractality in the signal is dominantly due to long-range correlations.

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System of Laser Interferometers with a Large Spatial Difference to Study the Seismic-Deformation Oscillations of the Earth

Dubrov,

Larionov,

Alexandrov

et al. 2023

J. Commun. Technol. Electron.

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Simultaneous response of high-frequency geoacoustic emission and atmospheric electric field to strain of near-surface sedimentary rocks

Cited by 5 publications

References 9 publications

The reason for synchronous disturbances in the atmospheric electric field and high-frequency geoacoustic emission during the seismotectonic process

The reason for synchronous disturbances in the atmospheric electric field and high-frequency geoacoustic emission during the seismotectonic process

Fractal analysis of seismoacoustic signals of near-surface sedimentary rocks in Kamchatka

System of Laser Interferometers with a Large Spatial Difference to Study the Seismic-Deformation Oscillations of the Earth

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