Genesis of continental seismogenic zone and a new fault zone model |
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Authors: | Junlai Liu M Shimada |
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Institution: | (1) Department of Earth Sciences, Changchun University of Science and Technology, 130026 Changchun, China;(2) RCEP, Disaster Prevention Research Institute, Kyoto University, 611-0011 Uji, Kyoto, Japan |
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Abstract: | Experiments were conducted repeatedly on Mannari granite under different temperature and confining pressure conditions. Systematic
micro- and submicro-structural and mechanical analyses of granite samples deformed under 1.5 GPa (confining pressure), at
25°C–650°C temperatures and at 2×10−6s−1 strain rate show the brittle-ductile deformation microstructures and microstructural associations similar to those observed
in naturally deformed crustal rocks and minerals. Brittle fracturing and crystalline plasticity co-exist and react with each
other in the brittle-ductile transition domain of the continental lithosphere. The interaction between the different mechanisms
in the transitional domain results in the variation of anomalous strength values, which may best explain the genesis of the
continental seismogenic zone. A new fault zone model is proposed on the basis of detailed micromechanical and microstructural
analyses. |
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Keywords: | granite experimental rock deformation continental seismogenic zone fault zone model |
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