Yu. V. Marapulets

Yu. V. Marapulets
Russian Academy of Sciences | RAS · Institute of Cosmophysical Researches and Radio Wave Propagation

About

41
Publications
1,019
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210
Citations
Citations since 2016
20 Research Items
159 Citations
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2016201720182019202020212022010203040
2016201720182019202020212022010203040
2016201720182019202020212022010203040

Publications

Publications (41)
Book
Full-text available
Complex methods and results of studies of physical processes and their interactions in the system of near space and geospheres under conditions of increased variability of solar, cyclonic and seismic activity are presented. The results of long-term observations are summed up. Methods of system analysis have been developed. Models of nonlinear and r...
Article
The paper presents the results of applying a developed approach based on sparse approximation methods for time–frequency analysis of geoacoustic data. A sparse representation of the geoacoustic signal and the developed adaptive matching pursuit algorithm are described using the combined dictionary of Berlage and Gauss functions. The results of the...
Article
Based on the integration and analysis of the published theoretical results and field observations, the possibility is considered of a joint perturbation in geoacoustic emission, radon, thoron, and the atmospheric electric field before an earthquake. A scheme is proposed for the formation of this perturbation in the presence of near-surface sediment...
Article
Full-text available
The results of wideband geophysical processes observations by means of laser strainmeters and special geo-acoustic equipment are presented. The examples of synchronous registering of strain-seismic and geo-acoustic earth oscillations in Kamchatka and Moscow region as well as parallel analysis of the obtained data are shown. These results reveal the...
Article
This paper reports results from observations of broadband geophysical processes using laser interferometer strainmeters and special acoustic instruments. We demonstrate examples of synchronous recordings of earth strain variations and geoacoustic oscillations of the ground surface in Kamchatka and in the Moscow Region, as well as results from a par...
Article
To study the directional properties of geoacoustic emission, the paper proposesthe use of a combined point receiver system moored at the bottom of a natural waterbody in Kamchatka. This system was used to analyze geoacoustic radiation in seismically quiescent periods and prior to earthquakes for the period of 2008–2016. For 111 cases of geoacoustic...
Article
In 2013, simultaneous observations of acoustic and electromagnetic emissions ranging from 200 Hz to 11 kHz were carried out in Kamchatka; as a result, abnormal surges of the emissions were registered 1–2 days before seismic events with magnitudes MLH ≥ 5 at a hypocentral distance up to 200 km. The most likely cause of the occurrence of the abnormal...
Article
Investigated is the periodic component of geoacoustic emission within the frequency band from 2.0 to 6.5 kHz registered by the piezoceramic hydrophone installed near the bottom of Lake Mikizha in the Kamchatka Peninsula. It is revealed that the variation period is 24 hours and the maximum variation is observed in summer, when the average daily air...
Article
Статья посвящена выявлению закона распределения частот в сигналах высокочастотной геоакустической эмиссии, возникающих в результате дислокационных изменений в осадочных породах. Для обработки эмиссионных импульсов используется разреженная аппроксимация, в результате которой происходит разложение сигнала на атомы с определенной частотой, соответству...
Article
In this work, a model of a geoacoustic emission signal constructed on the basis of methods of sparse approximation is presented and a model identification algorithm is proposed. The authors show that the simulation results make it possible to perform the classification of structural elements of the signal using symbolic approximation in the frequen...
Article
Full-text available
To investigate high frequency geoacoustic emission, a receiving system based on a compound vector receiver was installed in Kamchatka. It allows the authors to determine the direction of sound wave arrival. In the result of data analysis for the period from August 2008 to January 2016, it was determined that anomalies of geoacoustic emission direct...
Article
To investigate high frequency geoacoustic emission, a receiving system based on a compound vector receiver was installed in Kamchatka. It allows the authors to determine the direction of sound wave arrival. In the result of the data analysis for the period from August 2008 to January 2016, it was determined that geoacoustic emission directivity ano...
Article
С 1999 г. на Камчатском полуострове проводится комплексный мониторинг акустической эмиссии в звуковом диапазоне частот. В ходе исследований установлено существование акустоэмиссионного эффекта в осадочных породах, заключающегося в росте интенсивности геоакустического излучения в частотном диапазоне от сотен герц до первых десятков килогерц при увел...
Article
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...
Article
Complex monitoring of acoustic emission (AE) in the sound frequency range has been carried out in the Kamchatka peninsular since 1999. In the course of the investigation, the existence of acoustic emission effect in sedimentary rocks was detected. It consists in the increase of geoacoustic radiation intensity in the frequency range from hundreds of...
Article
Full-text available
The paper presents the results of investigations of deformation processes in the near-surface sedimentary rocks, which have been carried out in a seismically active region of the Kamchatka peninsula since 2007. The peculiarity of the experiments on registration of geodeformations is the application of a laser strainmeter–interferometer constructed...
Article
Full-text available
The paper presents the results of investigations of deformation processes in the near-surface sedimentary rocks, which have been carried out in a seismically active region of the Kamchatka peninsula since 2007. The peculiarity of the experiments on registration of geodeformations is the application of a laser strainmeter-interferometer constructed...
Article
A new approach for the time-frequency analysis of acoustic emission of the audible frequency range is proposed. The approach is based on the sparse approximation method. A basis dictionary based on Berlage functions is constructed with allowance for the characteristics of geoacoustic signals. It is shown that application of the developed method in...
Article
The influence of the lithosphere on the atmosphere near their interface in a seismic region was studied during summer-autumn 2006–2008 in Kamchatka by simultaneous measurements of geoacoustic emissions at frequencies of 2.0–6.5 kHz, the atmospheric electrical field at the ground surface, and meteorological quantities at a single site. We used nonpa...
Article
The results of geoacoustic emission investigations carried out on the seismoactive Kamchatka Peninsula since 1999 are presented. The experiments are characterized by the application of broadband piezoceramic sound receivers (hydrophones) for recording the emission. The hydrophones were installed at the bottom of natural and artificial water reservo...
Article
Full-text available
The effect was observed as a sharp fall of the electric potential gradient from +80 V m-1 down to -21 V m-1. After that the field returned to its normal level according to the formula of the capacitor discharge with 17 s characteristic time. Simultaneously, the response of the acoustic emission of surface rocks in the range of frequencies between 6...
Article
Full-text available
The effect of a single lightning discharge on electric field intensity in the near ground atmosphere was investigated. The effect appeared as a sharp fall of electric field potential gradient from 80 V m-1 up to -21 V m-1. The process of intensity recovery is described by flat capacitor model with characteristic time of recovery of 17 c. Simultaneo...
Article
During the period of October 1-18, 2009, 41 km southwest of Petropavlovsk-Kamchatsky, in the intersection zone of tectonic faults of various orders, simultaneous recording of the geoacoustic emission, gradient of the atmospheric electric field's potential, strains of the Earth's surface, atmospheric pressure, wind speed, and rain intensity was made...
Article
In July–October 2006 and 2007, combined measurements of geoacoustic emission in the range of 2.0–6.5 kHz, the electric field in the atmosphere near the ground, and meteorological values were carried out in Kamchatka. Using the nonparametric method of Spearman’s correlation analysis, the relationship between their average hourly values was examined....
Article
Changes in the directionality of surface high-frequency geoacoustic emission during periods of deformational disturbances on the diurnal time scale prior to strong seismic events on Kamchatka have been investigated. It has been shown that while the emission intensity grows by over an order of magnitude, sharp maxima appear in the direction of longi...
Article
The features of the use of a combined receiver that is able to record acoustic pressure and three mutually orthogonal components of its gradient simultaneously in a region of small wave sizes are discussed. This method can be used to record geoacoustic emission signal anomalies, which could be treated as useful earthquake precursors. Possible metho...
Article
Full-text available
One of the possible earthquake precursor mechanisms, namely, acoustic emission, is discussed. The phenomenon of acoustic emission consists in the emission of acoustic pulses due to the formation of microfaults and cracks that precede fracture of objects, rock collapse in mines, earthquakes, etc. By the example of the geoacoustic emission observatio...
Article
A field instrument package was installed for synchronous measurements of acoustic emission in rocks at frequencies of 0.1–10000 Hz and the vertical gradient of electric potential in near-ground atmosphere. These investigations for the first time revealed a relationship between emission disturbances in the kilohertz frequency range due to deformatio...
Article
Mechanisms of the generation of elastic oscillations in frequency range 0‐10 kHz during the final stage of earthquake preparation are studied using geoacoustic methods and observations of deformations in near-surface sedimentary rocks. It is shown that acoustic noises appear as a result of deformation motions in the medium in a stressed state. An i...

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