Near-surface geophysics: Complex investigations of the lithosphere-atmosphere interactions

Адушкин, В. В.; Спивак, А. А.

doi:10.1134/s1069351312020012

Cited by 21 publications

(12 citation statements)

References 14 publications

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“…Адуш кин и А.А. Спивак [Adushkin, Spivak, 2012] показали широкое распространение микросейсм с частотами 10 -4 -10 -5 и меньше на земном шаре. Их в основном образуют около 1 млн землетрясений с М≥2 и более 10000 -с М≥4.…”

Section: деформационные волны регионального и трансрегионального распunclassified

Deformation waves as a trigger mechanism of seismic activity in seismic zones of the continental lithosphere

Шерман¹

2013

Geodyn. Tectonophys.

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Deformation waves as a trigger mechanism of seismic activity and migration of earthquake foci have been under discussion by researchers in seismology and geodynamics for over 50 years. Four sections of this article present available principal data on impacts of wave processes on seismicity and new data. The first section reviews analytical and experimental studies aimed at identification of relationships between wave processes in the lithosphere and seismic activity manifested as spaceandtime migration of individual earthquake foci or clusters of earthquakes. It is concluded that with a systematic ap proach, instead of using a variety of terms to denote waves that trigger seismic process in the lithosphere, it is reasonable to apply the concise definition of 'deformation waves', which is most often used in fact.The second section contains a description of deformation waves considered as the trigger mechanism of seismic activity. It is concluded that a variety of methods are applied to identify deformation waves, and such methods are based on various research methods and concepts that naturally differ in sensitivity concerning detection of waves and/or impact of the waves on seismic process. Epicenters of strong earthquakes are grouped into specific linear or arcshaped systems, which common criterion is the same time interval of the occurrence of events under analysis. On site the systems compose zones with similar time sequences, which correspond to the physical notion of moving waves (Fig. 9). Periods of manifestation of such waves are estimated as millions of years, and a direct consideration of the presence of waves and wave parameters is highly chal lenging. In the current stateoftheart, geodynamics and seismology cannot provide any other solution yet.The third section presents a solution considering record of deformation waves in the lithosphere. With account of the fact that all the earthquakes with М≥3.0 are associated with fault zones, a brief description of the method for assessment of spatial and temporal regularities in locations of earthquake epicentres in zones of dynamic influence of faults is provided. The method can be applied to estimate a dominating direction of movement of the epicentres, which corresponds to the phase velocity of the deformation wave disturbing metastability of the faultblock medium, leading to displacement of neigh bouring blocks and thus causing a seismic event (Fig. 14). By integration of vectors of migration of epicentres at active faults, it is possible to demonstrate a pattern of vectors of movements of the deformation waves in the seismic zones of the continental lithosphere (Fig. 18).Regional and transregional deformation waves are analyzed. For seismic zones of Central Asia, vectors of deformation waves are established, a scheme showing regional orientations of the waves is developed, and main wave parameters (length and time period) are estimated (Fig. 19). Three depth levels of deformation waves are distinguished: the whole lithosphere, the upper brittle ...

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Section: деформационные волны регионального и трансрегионального распunclassified

Deformation waves as a trigger mechanism of seismic activity in seismic zones of the continental lithosphere

Шерман¹

2013

Geodyn. Tectonophys.

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“…Currently, both in Russia and abroad, seismic exploration is a dominant geophysical method, which refers to indirect exploration methods (Adushkin & Spivak, 2012). Despite new modifications, including three-dimensional modeling, the "success rate" among a number of attempts to drill exploratory wells, according to seismic prospecting, still does not exceed 0.5, i.e.…”

Section: Research Questionsmentioning

confidence: 99%

Oil And Gas Reservoir As A Cause Of Micro-Earthquake

Sirotinskiy¹

2022

The European Proceedings of Social and Behavioural Sciences

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The paper discusses a specific impact on reducing environmental risks that is an urgent issue modern science is concerned with. At present, one of the social challenges is to solve an acute problem of geological research -seismology. This socio-economic challenge affects a significant part of the population. Numerous studies show that the precursors of large earthquakes are a great number of micro-2357-1330

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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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Near-surface geophysics: Complex investigations of the lithosphere-atmosphere interactions

Cited by 21 publications

References 14 publications

Deformation waves as a trigger mechanism of seismic activity in seismic zones of the continental lithosphere

Deformation waves as a trigger mechanism of seismic activity in seismic zones of the continental lithosphere

Oil And Gas Reservoir As A Cause Of Micro-Earthquake

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

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