Some results of modeling D-D seismogenic pattern by the fracture model experiment of large-scale rock samples (I) |
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| Authors: | Yang-Quan Lu Jia-Liu Zhao Jia-Dong Qian Yu-Xiang Wang and Jian-Yi Liu |
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| Institution: | (1) Earthquake Research Institute of Lanzhou, State Seismological Bureau, 730000 Lanzhou, China;(2) Center for Analysis and Prediction, State Seismological Bureau, 100036 Beijing, China |
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| Abstract: | Using the natural limestone samples taken from the field with dimension of 500 mm×500 mm×1 000 mm, the D-D (dilatancy-diffusion)
seismogeny pattern was modeled under the condition of water injection, which observes the time-space evolutionary features
about the relative physics fields of the loaded samples from deformation, formation of microcracks to the occurrence of main
rupture. The results of observed apparent resistivity show: 1 The process of the deformation from microcrack to main rupture
on the loaded rock sample could be characterized by the precursory spatial-temporal changes in the observation of apparent
resistivity; 2 The precursory temporal changes of observation in apparent resistivity could be divided into several stages,
and its spatial distribution shows the difference in different parts of the rock sample; 3 Before the main rupture of the
rock sample the obvious “tendency anomaly” and “short-term anomaly” were observed, and some of them could be likely considered
as the “impending earthquake” anomaly precursor of apparent resistivity. The changes and distribution features of apparent
resistivity show that they are intrinsically related to the dilatancy phenomenon of the loaded rock sample. Finally, this
paper discusses the mechanism of resistivity change of loaded rock sample theoretically.
This subject is supported by the key project during the 8-th “Five Year Plan” from the State Science and Technology Commission
of China (85-04-04). |
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| Keywords: | fracture experiment of large-scale rock sample D-D seismogenic pattern apparent resistivity |
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