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《Chinese Journal of Geophysics》 1999-01
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ELECTRO- ACOUSTIC EFFECT IN ROCK FRACTURING

GUO ZI-QIANG;GUO ZI-QI; QIAN SHU-QING;LISHI-YU; LIU XIAO-HONG; LUO XIANG-LIN ; 1)(Graduate Schools in beijing, University of Sciences and Technology of China, Beijing 100039,China) 2)(Institute of Geo  
Electromagnetic (EM) and acoustic emissions ( AE) and their relations during the process of fracturing of various rock samples have been studied. The samples werefractured under either uniaxial compression or under double shearing. The data wererecorded using a high-speed recording system with 1 6 frequency channels andthree-component acoustic transducers. Our result shows that the emissions andproperties of EM and AE were affected strongly by the sizes and mineral compositions of rock samples. The relationships between EM and AE emissions were various; for example, some EM emissions were accompanied by AE, but some werenot.Our result suggests that in addition to micro fracturing, there may exist somenonfracturing mechanism responsible for electromagnetic emissions .
【Fund】: 国家自然科学基金 地震科学联合基金
【CateGory Index】: TU458.2
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