KEISHI OKAZAKI

Last Updated :2024/12/02

Affiliations, Positions
Graduate School of Advanced Science and Engineering, Associate Professor
Web Site
https://sites.google.com/view/keishiokazaki-jamstec/home
E-mail
keishiokazakihiroshima-u.ac.jp
Self-introduction
I study rheological properties (fracture, friction, crystal plasticity) of rocks and minerals, especially fault zone materials and metamorphic rocks (e.g., hydrated mantle, altered oceanic crust and sediments), and how they evolve during metamorphic reactions to understand the mechanism of normal/slow earthquakes in subduction zones.

Basic Information

Major Professional Backgrounds

  • 2022/04/01, Hiroshima University, Graduate School of Advanced Science and Engineering, Associate Professor
  • 2022/04/01, Japan Agency for Marine-Earth Science and Technology, Kochi Institute for Core Sample Research, x-star, Visiting Senior Researcher
  • 2018/04/01, 2018/09/30, Tohoku University, Adjunct Lecturer
  • 2016/10/01, 2022/03/31, Japan Agency for Marine-Earth Science and Technology, Kochi Institute for Core Sample Research, x-star, Researcher
  • 2016/10/01, 2016/12/31, Brown University, Department of Earh, Environmental and Planetary Sciences, Visiting Scientist
  • 2014/04/01, 2016/09/30, Brown University, Department of Earh, Environmental and Planetary Sciences, Postdoctoral Research Associate
  • 2013/04/01, 2014/03/31, Brown University, Department of Earh, Environmental and Planetary Sciences, Visiting Scholar
  • 2012/04/01, 2013/03/31, Hirhoshima University, Graduate School of Science,Department of Earth and Planetary Systems Sciences, JSPS Research fellow (DC2)
  • 2013/04/01, 2014/03/31, Hirhoshima University, Graduate School of Science,Department of Earth and Planetary Systems Sciences, JSPS Research fellow (PD)

Educational Backgrounds

  • Hiroshima University, Graduate School of Science , Japan, 2010/04, 2013/03
  • Hiroshima University, Graduate School of Science , Japan, 2008/04, 2010/03
  • Hiroshima University, School of Science, Japan, 2004/04, 2008/03

Academic Degrees

  • Hiroshima University
  • Hiroshima University

In Charge of Primary Major Programs

  • Earth and Planetary Systems Science

Research Fields

  • Mathematical and physical sciences;Earth and planetary science;Solid earth and planetary physics
  • Mathematical and physical sciences;Earth and planetary science;Geology
  • Mathematical and physical sciences;Earth and planetary science;Petrology / Mineralogy / Economic geology

Research Keywords

  • subduction zone, plate tectonics, earthquake, oceanic crust, mantle, metamorphic rocks, rheology, friction, permeability, serpentine

Affiliated Academic Societies

  • Japan Geoscience Union
  • Geological Society of Japan
  • American Geophysical Union

Educational Activity

Course in Charge

  1. 2024, Liberal Arts Education Program1, Intensive, Introduction to Science
  2. 2024, Liberal Arts Education Program1, Intensive, Introduction to Science
  3. 2024, Liberal Arts Education Program1, 1Term, Introductory Seminar for First-Year Students
  4. 2024, Undergraduate Education, 2Term, Rock Deformation I
  5. 2024, Undergraduate Education, First Semester, Practice of Earth and Planetary Systems Science A (Field Work)
  6. 2024, Undergraduate Education, First Semester, Special Study for Graduation
  7. 2024, Undergraduate Education, Second Semester, Special Study for Graduation
  8. 2024, Undergraduate Education, 3Term, Advanced Earth and Planetary Science
  9. 2024, Undergraduate Education, 4Term, Petrology laboratory
  10. 2024, Undergraduate Education, Year, Advanced Subject Research
  11. 2024, Graduate Education (Master's Program) , 3Term, Survey of Earth and Planetary Systems Science
  12. 2024, Graduate Education (Master's Program) , Year, Exercise for Globalization I
  13. 2024, Graduate Education (Master's Program) , Year, Exercise for Globalization II
  14. 2024, Graduate Education (Master's Program) , Year, Externship for Earth and Planetary Systems Science
  15. 2024, Graduate Education (Master's Program) , Year, Integrated Seminar on Earth and Planetary Systems Science
  16. 2024, Graduate Education (Master's Program) , First Semester, Midterm Exercise for Earth and Planetary Systems Science
  17. 2024, Graduate Education (Master's Program) , First Semester, Special Exercise for Earth and Planetary Systems Science A
  18. 2024, Graduate Education (Master's Program) , Second Semester, Special Exercise for Earth and Planetary Systems Science B
  19. 2024, Graduate Education (Master's Program) , Academic Year, Special Study for Earth and Planetary Systems Science
  20. 2024, Graduate Education (Doctoral Program) , Academic Year, Special Study for Earth and Planetary Systems Science

Research Activities

Academic Papers

  1. A history of mild shocks experienced by the regolith particles on hydrated asteroid Ryugu, NATURE ASTRONOMY, 7(6), 669-677, 202306
    Link to Paper Search Results by DOI
  2. Role of mantle carbonation in trench outer-rise region in the global carbon cycle, ISLAND ARC, 32(1), 202309
    Link to Paper Search Results by DOI
  3. Paleo-Permeability Structure of the Crustal Section of the Samail Ophiolite Based on Automated Detection of Veins in X-Ray CT Core Images From the Oman Drilling Project, GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS, 24(6), 202306
    Link to Paper Search Results by DOI
  4. Cross-Property Relationship Between Electrical Resistivity and Elastic Wave Velocity of Crustal Rocks From the Oman Drilling Project Hole GT3A: Implications for in Situ Geophysical Properties of Oceanic Crust, JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, 128(6), 202306
    Link to Paper Search Results by DOI
  5. Development of Lattice-Preferred Orientations of MgO Periclase From Strain Rate Controlled Shear Deformation Experiments Under Pressure up to 120 GPa, GEOPHYSICAL RESEARCH LETTERS, 49(21), 20221116
    Link to Paper Search Results by DOI
  6. Deformation and Material Transfer in a Fossil Subduction Channel: Evidence From the Island of Elba (Italy), TECTONICS, 41(7), 202207
    Link to Paper Search Results by DOI
  7. The evolution of rock friction is more sensitive to slip than elapsed time, even at near-zero slip rates, Proceedings of the National Academy of Sciences, 119(30), e2119462119, 20220620
  8. Simultaneous Measurements of Elastic Wave Velocity and Porosity of Epidosites Collected From the Oman Ophiolite: Implication for Low V-P/V-S Anomaly in the Oceanic Crust, GEOPHYSICAL RESEARCH LETTERS, 49(11), 20220616
    Link to Paper Search Results by DOI
  9. ★, Major Mineral Fraction and Physical Properties of Carbonated Peridotite (Listvenite) From ICDP Oman Drilling Project Hole BT1B Inferred From X-Ray CT Core Images, Journal of Geophysical Research: Solid Earth, 126, e2021JB022719, 20211029
  10. ★, Rheology of the fluid oversaturated fault zones at the brittle-plastic transition, Journal of Geophysical Research: Solid Earth, 126, e2020JB020804, 20201226
  11. Deformation of mafic schists from subducted oceanic crust at high pressure and temperature conditions, Tectonphysics, 774, 20191109
  12. ★, Dehydration of lawsonite can directly trigger earthquakes in subducting oceanic crust, Nature, 530, 81-84, 20160204
  13. ★, Slow stick–slip of antigorite serpentinite under hydrothermal conditions as a possible mechanism of slow earthquakes, Geophysical Research Letter, 42, 1099-1104, 20150130
  14. Permeability, porosity and pore geometry evolution during compaction of Neogene sedimentary rocks, Journal of Structural Geology, 62, 1-12, 20140111
  15. Shear-induced permeability anisotropy of simulated serpentinite gouge produced by triaxial deformation experiments, Geophysical Research Letter, 40, 1-5, 20130226