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《Earthquake》 1986-04
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LOW FREQUENCY ELECTROMAGNETIC EMISSION IN THE PROCESS OF ROCK FRACTURES

Sun Zhengjiang Wang Lihua Wu Zhongliang (Department of Geophysics, Beijing University)  
The experiments of rock ruptures conducted with 100 ton press indicated that the brittle ruptures of granodolerite, marble, and some limestone samples were accompanied by low frequancy electromagnetic emission with 5 kHz to 7 kHz. The average emission amplitude was 2 or 3 orders of magnitude higher than that derived theoretically from piezoelectrieal effects. The experimental phenomena might be direct manifestations of dynamic features of crack growth during the brittle ruptures of rock samples. Semi-quantitative discussions are made on these experiments in this paper.
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