The experimental study of acoustic emission during creep of rocks |
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| Authors: | Peiling Lü Kaitong Wu Yuanbi Jiao Jihan Li and Xiaohong Liu |
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| Institution: | (1) Center for Analysis and Prediction, State Seismological Bureau, 100036 Beijing, China;(2) Institute of Geophysics, State Seismological Bureau, 100081 Beijing, China |
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| Abstract: | Under normal temperature, the creep experiments with complete samples of Gabbro and Marble rocks are made under uniaxial compression.
It is found that at the instantaneous creeping stage, AE activities increase with loading; at the steady creeping stage, large
AE signals may appear at lower background of AE action, andm—value which shows the relationship between AE amplitude and frequency keeps stable on the low value or decreases; at the
accelerate creeping stage, AE activities increase andm—value decreases quickly or decreases again after recovery. These experimental results are related to the quality of the samples.
In this paper, AE activities during three stages of creeping process are connected with the seismic patterns (for exampleb—value, foreshocks). Finally, it is pointed out the possibility that the foreshock—mainshock—aftershock earthquake sequence
has been formed by the mechanism of creep fracture of crustal rocks.
The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,13, 104–112, 1991.
This subject is sponsored by the Chinese Joint Seismological Science Foundation. |
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| Keywords: | creep failure experiment acoustic emission b— value earthquake sequence |
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