scholarly journals ESTIMATION OF LONG-RANGE CORRELATION SCALES BY SEISMOACOUSTIC EMISSION SIGNALS OF NEAR-SURFACE SEDIMENTARY ROCKS IN KAMCHATKA

2019 ◽  
pp. 190-200
Author(s):  
В.Н. Сычёв ◽  
М.А. Мищенко ◽  
С.А. Имашев ◽  
М.Е. Чешев
Keyword(s):  
Long Range ◽  
Ground Surface ◽  
Frequency Range ◽  
Self Similarity ◽  
Observation Site ◽  
Near Surface ◽  
Long Range Correlations ◽  
Seismic Receiver ◽  
Range Correlation ◽  
Geophysical Observation

На Камчатке в пункте комплексных геофизических наблюдений ИКИР ДВО РАН Карымшина для регистрации сигналов сейсмоакустической эмиссии на поверхности земли установлен измерительный комплекс. В качестве датчика сигналов используется трехкомпонентный пьезокерамический сейсмоприемник, который регистрирует колебательное ускорение в частотном диапазоне 0.5-400 Гц. Рассмотрен сейсмоакустический отклик на несколько региональных землетрясений с энергетическим классом Ks 11:0 в период 2017-2018 гг. При помощи статистических методов установлено самоподобие их структуры на ограниченном интервале временных масштабов. Это, в свою очередь, указывает на наличие дальних корреляций в рассматриваемой системе и позволяет получить оценку масштабов корреляций. A measurement complex is installed on the ground surface at Karymshina complex geophysical observation site of IKIR FEB RAS (Kamchatka) to record seismoacoustic emission signals. A three-component piezoceramic seismic receiver, which records oscillatory acceleration in the frequency range from 0.2 to 400 Hz, is used as the signal sensor. A series of seismoacoustic responses on regional earthquakes of 2017-2018 with the energy class Ks 11:0 has been considered. Self-similarity of their structures has been established in a limited interval of time scales by statistical methods. That, in its turn, indicates the presence of long-range correlations in the system under consideration and allows one to estimate correlation scales.

Experimental evidence of long-range correlations and self-similarity in plasma fluctuations

1999 ◽  
Vol 6 (5) ◽  
pp. 1885-1892 ◽  
Author(s):  
B. A. Carreras ◽  
B. Ph. van Milligen ◽  
M. A. Pedrosa ◽  
R. Balbı́n ◽  
C. Hidalgo ◽  
...  
Keyword(s):  
Experimental Evidence ◽  
Long Range ◽  
Self Similarity ◽  
Plasma Fluctuations ◽  
Long Range Correlations

scholarly journals Publisher’s Note: “Experimental evidence of long-range correlations and self-similarity in plasma fluctuations” [Phys. Plasmas 6, 1885 (1999)]

2003 ◽  
Vol 10 (11) ◽  
pp. 4592-4592
Author(s):  
B. A. Carreras ◽  
B. Ph. van Milligen ◽  
M. A. Pedrosa ◽  
R. Balbı́n ◽  
C. Hidalgo ◽  
...  
Keyword(s):  
Experimental Evidence ◽  
Long Range ◽  
Self Similarity ◽  
Plasma Fluctuations ◽  
Long Range Correlations

scholarly journals Features of the Earth surface deformations in Kamchatka peninsula and their relation with geoacoustic emission

2014 ◽  
Vol 6 (2) ◽  
pp. 2401-2422 ◽  
Author(s):  
I. A. Larionov ◽  
Yu. V. Marapulets ◽  
B. M. Shevtsov
Keyword(s):  
Michelson Interferometer ◽  
Kamchatka Peninsula ◽  
Frequency Range ◽  
Observation Site ◽  
Near Surface ◽  
Geoacoustic Emission ◽  
Direction Change ◽  
The Earth ◽  
Rock Deformations ◽  
Artificial Water

Abstract. The paper presents the results of investigations of deformation process in the near surface sedimentary rocks, which has been carried out in a seismically active region of Kamchatka peninsular since 2007. The peculiarity of the experiments on registration of geodeformations is the application of a laser strainmeter-interferometer constructed according to the Michelson interferometer scheme. Besides rock deformations, geoacoustic emission in the frequency range from several hertz to the first tens of kilohertz is under the investigation. Piezoceramic hydrophones installed in artificial water reservoirs are applied. It is shown that periods of primary rock compression and tension with the duration up to several months are distinguished in the geodeformation process at the observation site. During the direction change in the deformations, when geodeformation process rate grows, the increase of geoacoustic radiation is observed.

Investigation Geological structural morphology of Quaternary sediment on coastal Bac Lieu

2018 ◽  
Vol 25 (2) ◽  
pp. 167-172
Author(s):  
Nguyễn Văn Giảng ◽  
Lê Ngọc Thanh
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Ground Surface ◽  
Field Analysis ◽  
Radio Waves ◽  
Frequency Range ◽  
Quaternary Sediment ◽  
Structural Morphology ◽  
Near Surface ◽  
Shallow Structure

Georadar is a high-resolution near-surface geophysical method which employ radio waves, typically in the 1 to 1000 MHz frequency range tomap structure and features buried in the ground (or in man-made structures). Georadar method with Pulse EKKO 1 OOA instrument offers the highest resolution and rapidly provides continuous graphicformat which permits rapid semi-quantitative interpretation for in-field analysis. VLF method with Wadi instrument records the ratio of the strengths of the vertical and horizontal fields at the ground surface. Then this method can be used to reveal steeply dipping structures with large cross-sections and low resistivities as fructure/ conductivity zones.This paper is presented the result of using Georadar, VLF and electrical profiling methods for geological structural morphology of quaternarysediment investigation on coastal Baclieu. The structural cross-section of morphology of quaternary sediment is established by nine layers of georadar data for shallow structure and several interfaces of conductivity for deeper structure.

Experimental evidence of the self-similarity and long-range correlations of the edge fluctuations in HT-6M tokamak

2001 ◽  
Vol 10 (2) ◽  
pp. 139-144 ◽  
Author(s):  
Wang Wen-hao ◽  
Yu Chang-xuan ◽  
Wen Yi-zhi ◽  
Xu Yu-hong ◽  
Ling Bi-li ◽  
...  
Keyword(s):  
Experimental Evidence ◽  
Long Range ◽  
The Self ◽  
Self Similarity ◽  
Long Range Correlations

scholarly journals Long-range correlation and nonlinearity in geochemical time series of gas discharges from Mt. Etna, and changes with 2001 and 2002–2003 eruptions

2010 ◽  
Vol 17 (6) ◽  
pp. 733-751 ◽  
Author(s):  
A. Paonita
Keyword(s):  
Time Series ◽  
Long Range ◽  
Time Series Data ◽  
Flicker Noise ◽  
Series Data ◽  
Scaling Exponent ◽  
Time Reversibility ◽  
Long Range Correlations ◽  
Range Correlation ◽  
Mt Etna

Abstract. In this paper, spectral and detrended fluctuation analyses, as well as time reversibility and magnitude-sign decomposition, have been applied to the 10-year time-series data resulting from geochemical monitoring of gas emissions on the flanks of Mt. Etna, and gases from a CO2 exploitation well located tens of kilometers from the volcano. The analysis of the time series which showed main effects of fractionation between gases due to selective dissolution in aquifers (e.g., the CO2 concentration series), revealed the occurrence of random fluctuations in time, typical of systems where several processes combine linearly. In contrast, the series of He isotopic composition exhibited power-law behavior of the second-order fluctuation statistics, with values of the scaling exponent close to 0.9. When related to the spectral exponent, this value indicates that the isotopic series closely resemble fractal flicker-noise signals having persistent long-range correlations. The isotopic signals also displayed asymmetry under time reversal and long-range correlation of the associated magnitude series, therefore it was statistically proved the presence of nonlinearity. Both long-range correlation and nonlinearity in time series have been generally considered as distinctive features of dynamic systems where numerous processes interact by feedback mechanisms, in accordance with the paradigm of self-organized criticality (SOC). Thus, it is here proposed that the system that generated the isotope series worked under conditions of SOC. Since the fluctuations of the isotope series have been related to magma degassing, the previous results place constraints on the dynamics of such process, and suggest that nonequilibrium conditions must be dominant. It remains unclear whether the signature of SOC is directly due to volatile degassing from magma, or if it derives from the interaction between melt and the stress field, which certainly influences magma decompression. The strength of scaling appears to increase after 2002 (α values from 0.8 up to 1.2), focusing on transition of the Etnean system from typical SOC toward conditions of lower criticality. By comparing this transition with those of geophysical observables, it can be suggested that the drop in the rate of magma supply, subsequent to the paroxysms of 2001 and 2002–2003, was the main cause of the scaling change.

NONLINEAR PROPERTIES, FRACTAL BEHAVIOR AND LONG-RANGE CORRELATION ANALYSIS OF THE CHINESE FUND MARKET

2010 ◽  
Vol 21 (01) ◽  
pp. 79-95 ◽  
Author(s):  
WEIBING DENG ◽  
WEI LI ◽  
XU CAI
Keyword(s):  
Long Range ◽  
Financial Market ◽  
Hurst Exponent ◽  
Statistical Hypothesis ◽  
Fluctuation Analysis ◽  
Statistical Hypothesis Testing ◽  
Self Similarity ◽  
Nonlinear Properties ◽  
Range Correlation ◽  
Detrended Fluctuation

Applying the statistical hypothesis testing, we investigate several nonlinear properties embedded in the return series of the Chinese Fund Market (CFM), which suggests the series is non-normal, auto-correlative and heteroskedastic. We hereby analyze the Hurst exponent of the return series in different timescales on the basis of the detrended fluctuation analysis (DFA) algorithm, and discuss the fractal behavior of the CFM. Furthermore, by studying the correlation of different weights in the volatility, we find the persistent long-range power-law correlation exists in the time series. We also provide hints that the above statistical properties are insensitive to the funds kind, and may be irrelevant to the market phases. Our work may reveal the self-similarity characteristics of the financial market and show a better understanding of the CFM.

scholarly journals ENERGY DEPENDENCE OF SHORT AND LONG-RANGE MULTIPLICITY CORRELATIONS IN Au+Au COLLISIONS FROM STAR

2007 ◽  
Vol 16 (10) ◽  
pp. 3363-3370 ◽  
Author(s):  
◽  
TERENCE TARNOWSKY
Keyword(s):  
Long Range ◽  
Energy Dependence ◽  
Incident Energy ◽  
Density Parameter ◽  
Long Range Correlations ◽  
General Overview ◽  
Range Correlation ◽  
Star Experiment ◽  
Insight Into ◽  
Made In

A general overview of the measurement of long-range multiplicity correlations measured by the STAR experiment in Au + Au collisions at RHIC is presented. The presence of long-range correlations can provide insight into the early stages, and the type of matter produced in, these collisions. These measurements have been made in Au + Au collisions at [Formula: see text] and 62.4 GeV. These results indicate a relatively large long-range correlation is produced in Au + Au collisions compared to a pp baseline at [Formula: see text]. A weaker long-range correlation is seen as a function of incident energy. Further, comparison of the onset of the long-range correlation to the calculated percolation density parameter at [Formula: see text] is presented.

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