2013 Fiscal Year Final Research Report
Coseismic dehydroxylation in clay minerals and implications for fault weakening during earthquakes
| Project/Area Number |
23684039
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| Research Category |
Grant-in-Aid for Young Scientists (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
Solid earth and planetary physics
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| Research Institution | Osaka University |
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Principal Investigator |
HIRONO Tetsuro 大阪大学, 理学(系)研究科(研究院), 准教授 (70371713)
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| Project Period (FY) |
2011-04-01 – 2014-03-31
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| Keywords | 断層 / 地震 |
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| Research Abstract |
To elucidate that released water from clay mineral affects dynamic fault weakening and energetics during earthquakes, I first made experimental determinations of the kinetic parameters of the dehydroxylation reaction of illite-muscovite as representative components in the fault gouges, and measured the specific heat capacity and thermal diffusivity. I performed numerical analyses of dynamic fault weakening, taking into account the dehydroxylation reaction of illite on the basis of our experimental results. I clarify that released fluids assist in the pressurization of pore fluid and subsequently induce a decrease in effective normal stress on faults, and that the dehydroxylation reaction takes up heat from the energy released on the fault during earthquake slip. This effect, which inhibits the rise in temperature in the fault, may be significant in clay-rich faults such as subduction boundary faults.
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[Journal Article] Re-evaluation of frictional heat recorded in the dark gouge of the shallow part of a megasplay fault at the Nankai Trough2014
Author(s)
Hirono, T., Ishikawa, T., Masumoto, H., Kameda, J., Yabuta, H., and Mukoyoshi, H
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Journal Title
Peer Reviewed
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[Journal Article] Estimation of slip parameters associated with frictional heating during the 1999 Taiwan Chi-Chi earthquake by vitrinite reflectance geothermometry2014
Author(s)
Maekawa, Y., Hirono, T., Yabuta, H., Mukoyoshi, H., Kitamura, M., Ikehara, M., Tanikawa, W., and Ishikawa, T
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Journal Title
Peer Reviewed
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[Journal Article] Importance of mechanochemical effects on fault slip behavior during earthquakes2013
Author(s)
Hirono, T., Tanikawa, W., Honda, G., Kameda, J., Fukuda, J., and Ishikawa, T.
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Journal Title
Geophysical Research Letters
Volume: 40
Pages: 1–5
DOI
Peer Reviewed
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[Presentation] Geochemical signature of fluid-rock interaction in the fault gouge from the Middle Tectonic Line, Japan2011
Author(s)
Matsuta, N., Ishikawa, T., Kameda, J., Kawamoto, K., Nishio, T., Honda, G. and Hirono, T
Organizer
AGU (American Geophysical Union) 2011 Fall Meeting
Place of Presentation
San Francisco, USA
Year and Date
2011-12-07
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[Presentation] Fluid rock interaction of the gouge samples of the Median Tectonic Line2011
Author(s)
Matsuta, N., Ishikawa, T., Kameda, J., Kawamoto, K., Nishio, T., Honda, G., and Hirono, T
Organizer
Asia Oceania Geoscience Society 8th Annual General Meeting
Place of Presentation
Taipei
Year and Date
2011-08-12
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