Comparative analysis of acoustic and electromagnetic emissions of rocks

Comparative analysis of acoustic and electromagnetic emissions recorded during the intact rock samples deformation and dynamic rupture of simulated crustal fault is presented. Specialized machines for uniaxial compression and shear tests of rock samples with identical data acquisition systems for bo...

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Bibliographic Details
Published in:IOP conference series. Earth and environmental science 2021-11, Vol.929 (1), p.12013
Main Authors: Klyuchkin, V N, Novikov, V A, Okunev, V I, Zeigarnik, V A
Format: Article
Language:English
Subjects:
Acoustic emission
Acoustic emission testing
Acoustics
Comparative analysis
Compression
Compression tests
Data acquisition
Earthquake prediction
Earthquakes
Emission analysis
Emissions
Failure
Rocks
Rupture
Rupturing
Seismic activity
Shear tests
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Summary:Comparative analysis of acoustic and electromagnetic emissions recorded during the intact rock samples deformation and dynamic rupture of simulated crustal fault is presented. Specialized machines for uniaxial compression and shear tests of rock samples with identical data acquisition systems for both test cases were employed. Increase of acoustic emission was observed accompanied by significant rise of intensity and amplitude of electromagnetic signals at high stress of the rock samples under the uniaxial compression or dynamic failure in the spring-block model. Such correlation is consistent with the previous conclusions that an increase of electromagnetic emission may be considered as a rock failure precursor. Any specific characteristics of the detected electromagnetic signals to be used for prediction of impending rock failure or the earthquake fault rupture were not found. The similarity of electromagnetic signals and their spectra obtained at the press equipment and the spring-block model suggests that in both cases, the signals observed are generated by the crack formations and shear. The electromagnetic emission appeared only in dry samples. The samples saturated by water with the salinity of over 0.1% demonstrated no electromagnetic emission.
ISSN:1755-1307
1755-1315
DOI:10.1088/1755-1315/929/1/012013