Directionality of surface high-frequency geoacoustic emission during deformational disturbances

Шевцов, Б. М.; Marapulets, Yu. V.; Shcherbina, Albert

doi:10.1134/s1028334x10010150

Cited by 11 publications

(7 citation statements)

References 2 publications

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“…The methods described above to determine the direction to geoacoustic emission source were realized in special software which allowed us to compare the results of both approaches. Figure 5 shows It is clear from figure 5 that the periods of seismic event preparation and occurrences are characterized by inequality of azimuthal distribution of signal arrival directions that agrees with the works which had been carried out before [7]. We can see the areas from which both direct and the corresponding reflected signals were recorded.…”

Section: Results Of Geoacoustic Pulse Investigations In Three-dimensisupporting

confidence: 75%

Methods for spatial direction finding of geoacoustic signals at Mikizha Lake in Kamchatka

Shcherbina

Solodchuk

2018

E3S Web Conf.

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In the framework of the work, a spatial analysis of geoacoustic emissions properties recorded by a hydroacoustic receiver in a shallow Mikizha Lake, Kamchatkskiy kray, is carried out. The features of geoacoustic pulse registration are considered, methods to determine the directions of their arrival and to locate the sources are proposed. Examples of geoacoustic signals during background periods and seismic event preparation periods are presented. *

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Section: Results Of Geoacoustic Pulse Investigations In Three-dimensisupporting

confidence: 75%

Methods for spatial direction finding of geoacoustic signals at Mikizha Lake in Kamchatka

Shcherbina

Solodchuk

2018

E3S Web Conf.

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“…Combined hydroacoustic receivers are installed by the bottom of natural and artificial water bodies [ 9 ]. Results of the experimental research in closed inner water bodies and on the ocean shelf demonstrate that signal form distortion, when propagating in a waveguide (water layer—soil near-surface layer) at short distances, is insignificant [ 8 , 10 ].…”

Section: Recording System For Sound Range Acoustic Emissionmentioning

confidence: 99%

“…To develop methods for the processing and analysis of sound range AE signals, we investigated the characteristics of the signals occurring during rock deformation [ 9 , 12 ]. It was stated that a typical AE signal is composed of a sequence of relaxation pulses of different amplitude and duration with shock excitation and the filling frequency from hundreds of hertz to ten kilohertz.…”

Section: Acoustic Emission Signal Processingmentioning

confidence: 99%

Sound Range AE as a Tool for Diagnostics of Large Technical and Natural Objects

Marapulets

Solodchuk

Lukovenkova

et al. 2023

Sensors

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Application of acoustic emission of the sound frequency range is under consideration. This range is of current interest for the diagnostics of the stability of mountain slopes, glaciers, ice covers, large technical constructions (bridges, dams, etc.) as well as for the detection of rock deformation anomalies preceding earthquakes. Acoustic sensors, which can be used to record and to determine the directivity of acoustic emission of the sound frequency range, are under consideration. The structure of the system for acoustic emission recording, processing and analysis is described. This system makes it possible to determine the direction to the acoustic emission source using one multi-component sensor. We also consider the algorithms for detection of acoustic emission pulses in a noisy background, and for the analysis of their structure using the Adaptive Matching Pursuit algorithm. A method for the detection of the direction to an acoustic emission signal source based on multi-component sensors is described. The results of application of sound range acoustic emission for the detection of the intensification of rock deformations, associated with earthquake preparation and development in the seismically active region of Kamchatka peninsula, are presented.

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“…In this case, the refraction coefficient is about 1.2-1.7. Taking into account small distances of signal propagation (first tens of meters), the refraction effects can be neglected [8]. The results of experimental investigations in closed inner water bodies [4] and on the ocean shelve [9] show that at large distances, distortion of pulse signal forms is insignificant when they propagate in a waveguide consisting of a water layer and a near-surface ground layer.…”

Section: Introductionmentioning

confidence: 99%

Adaptive Approach to Time-Frequency Analysis of AE Signals of Rocks

Lukovenkova¹,

Marapulets²,

Solodchuk³

2022

Sensors

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The paper describes a new adaptive approach to the investigation of acoustic emission of rocks, the anomalies of which may serve as short-term precursors of strong earthquakes. The basis of the approach is complex methods for monitoring acoustic emission and for analysis of its time-frequency content. Piezoceramic hydrophones and vector receivers, installed at the bottom of natural and artificial water bodies, as well as in boreholes with water, are used as acoustic emission sensors. To perform a time-frequency analysis of geoacoustic signals, we use a sparse approximation based on the developed Adaptive Matching Pursuit algorithm. The application of this algorithm in the analysis makes it possible to adapt to the concrete characteristics of each geoacoustic pulse. Results of the application of the developed approach for the investigation of acoustic emission anomalies, occurring before earthquakes, are presented. We analyzed the earthquakes, that occurred from 2011 to 2016 in the seismically active region of the Kamchatka peninsula, which is a part of the circum-Pacific orogenic belt also known as the “Ring of Fire”. It was discovered that geoacoustic pulse frequency content changes before a seismic event and returns to the initial state after an earthquake. That allows us to make a conclusion on the transformation of acoustic emission source scales before earthquakes. The obtained results may be useful for the development of the systems for environmental monitoring and detection of earthquake occurrences.

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Directionality of surface high-frequency geoacoustic emission during deformational disturbances

Cited by 11 publications

References 2 publications

Methods for spatial direction finding of geoacoustic signals at Mikizha Lake in Kamchatka

Methods for spatial direction finding of geoacoustic signals at Mikizha Lake in Kamchatka

Sound Range AE as a Tool for Diagnostics of Large Technical and Natural Objects

Adaptive Approach to Time-Frequency Analysis of AE Signals of Rocks

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