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Kyuichi Kanagawa

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Tectonophysics Group

Department of Earth Sciences

Topics

Drilling into the Nankai Trough accretionary prism by the JAMSTEC D/V Chikyu, in an attempt to reach a megathrust fault zone at seismogenic depths, has been conducted off Kii Peninsula since 2007, although it ended up not reaching the target by March, 2019. I have been onboard Chikyu as a shipboard scientist or a co-chief scientist 6 times for 4.5 months in total from 2007 to 2018, and engaged in drilling and descriptions, analyses and experiments of cored samples.

Research Subjects

I have studied deformation processes and mechanisms of crust and uppermost mantle rocks based on analyses of their deformation microstructures over twenty years. Target rocks have been granites, gabbros and peridotites deformed in the upper crust, lower crust and uppermost mantle, respectively. I also have studied seismic anisotropy and seismic reflectivity in the crust and uppermost mantle based on acoustic velocity measurements of crust and uppermost mantle rocks in laboratory. My main research subject at present is understanding seismogenic faulting along subduction-zone megathrusts by means of hydrothermal friction experiments on variable materials including samples cored from the Nankai Trough accretionary prism.

Selected Publications

  • Furusho, M. and Kanagawa, K. (1999) Transformation-induced strain localization in a lherzolite mylonite from the Hidaka metamorphic belt of central Hokkaido, Japan. Tectonophysics, 313, 411–432.
  • Kanagawa, K., Cox, S. F. and Zhang, S. (2000) Effects of dissolution-precipitation processes on the strength and mechanical behavior of quartz gouge at high-temperature hydrothermal conditions. Journal of Geophysical Research, 105, 11,115–11,126.
  • Tsurumi, J., Hosonuma, H. and Kanagawa, K. (2003) Strain localization due to a positive feedback of deformation and myrmekite-forming reaction in granite and aplite mylonites along the Hatagawa Shear Zone of NE Japan. Journal of Structural Geology, 25, 557–584.
  • Kanagawa, K., Shimano, H. and Hiroi, Y. (2008) Mylonitic deformation of gabbro in the lower crust: A case study from the Pankenushi gabbro in the Hidaka metamorphic belt of central Hokkaido, Japan. Journal of Structural Geology, 30, 1150–1166.
  • Yamane, N., Kanagawa, K. and Ito, T. (2012)? Contrasting seismic reflectivity of the lower crust and uppermost mantle between NE Japan and SW Japan as illustrated by petrophysical analyses of mafic and ultramafic xenoliths.? Journal of Geophysical Research, 117, B09203, doi:10.1029/2011JB009008.
  • Takahashi, M., Azuma, S., Ito, H., Kanagawa, K. and Inoue, A. (2014)? Frictional properties of the shallow Nankai Trough accretionary sediments dependent on the content of clay minerals.? Earth, Planets and Space, 66, 75, doi:10.1186/1880-5981-66-75.
  • Wada, J., Kanagawa, K., Kitajima, H., Takahashi, M., Inoue, A., Hirose, T., Ando, J. and Noda, H. (2016) Frictional strength of ground dolerite gouge at a wide range of slip rates. Journal of Geophysical Research, 121, 2961–2979.

Teaching

General Education Course

  • Faulting and Earthquakes
  • Basic Laboratory/Field Class of Earth Sciences A
  • Basic Laboratory/Field Class of Earth Sciences C

Undergraduate Course

  • Outline of Geodynamics 2
  • Structural Geology I -1, 2
  • Structural Geology II -1
  • Field Class of Geology II
  • Laboratory Class of Structural Geology I
  • Laboratory Class of Structural Geology II
  • Field Class of Structural Geology I
  • Field Class of Structural Geology II
  • Earth Science Seminar
  • Undergraduate Research

Graduate Course

  • Basic Geodynamics 1
  • Tectonophysics IV
  • Tectonophysics V
  • Advanced Seminar I
  • Graduate Research I
  • Advanced Seminar II
  • Graduate Research II

Academic Society Membership

  • Geological Society of Japan
  • Seismological Society of Japan
  • Geological Society of America
  • American Geophysical Union
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