2015 Fiscal Year Final Research Report
Comprehensive understanding of dynamic rupture : effects of dilatancy, shear heating, fluid and heat flows and dehydration reaction
| Project/Area Number |
25400440
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Solid earth and planetary physics
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| Research Institution | The University of Tokyo |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
KAME Nobuki 東京大学, 地震研究所, 准教授 (90304724)
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Keywords | 地震 / 流体 / 脱水反応 / 破砕 |
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| Outline of Final Research Achievements |
Focusing on the effect of fluid, we theoretically studied dynamic fault slip taking account of not only physical process but also chemical reaction. As the physical process, we assumed slip-induced dilatancy, shear heating and heat and fluid flows. We consider dehydration reaction as the chemical reaction. We specifically studied how the above effects give rise to apparently diversity in fault slip phenome, as found in the difference between slow slip events (SSEs) and ordinary earthquakes, through fluid pressure change. Our calculations show that sustained slow slip events occur when the dehydration reaction is coupled with slip-induced dilatancy. Specifically, slow slip is favored by a low initial stress drop, an initial temperature of the medium close to that of the dehydration reaction equilibrium temperature, a low permeability and overall negative volume change associated with the reaction. Ordinally earthquakes are shown to occur for negligible slip-induced dilatancy.
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| Free Research Field |
地震学
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