The experimental research on b value of AE for the rock specimens with pre-existing crack or notch under uniaxial compression |
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Authors: | Hong Li Xiangchu Yin Shiyu Li and Jihan Li |
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Institution: | (1) Institute of Geophysics, State Seismological Bureau, 100081 Beijing, China |
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Abstract: | A lot of researches onb value have been made in seismology. Since the 1960’s Mogi, Scholz and others have studied AE of rock specimens in laboratory
and discovered that it is related to natural earthquakes. All former researchers used integral specimens to studyb value in the laboratory. However a major earthquake is usually related to a existing seismic-fault in that area. For this
reason, a series of fracture experiments with rock and glass specimens having pre-existing crack or notch is performed in
order to examine the effect of preexisting crack tob value. The experimental results show that theb value begins to decrease as soon as the initiation of the crack and finally drop to a very low value when the specimen breaks
unstably. Based on these, a brief discussion on the possible mechanism ofb value change for natural earthquakes is given.
The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,9, 393–400, 1987.
Projects sponsored by the Chinese Joint Seismological Science Foundation. |
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Keywords: | b value acoustic emission experiment on rock fracture seismic activity earthquake prediction |
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