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Verified email domains

Websites & social links

https://sites.google.com/view/keishiokazaki-jamstec/home

Other IDs

ResearcherID: N-2058-2016
Scopus Author ID: 53164567600

Countries

Japan

Activities

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Employment (5)

Hiroshima University: Higashi-Hiroshima, Hiroshima, JP

2022-04-01 to present | Associate Professor (Earth and Planetary Systems Science Program)
Employment
Source: Self-asserted source
Keishi Okazaki

Japan Agency for Marine-Earth Science and Technology: Nankoku, Kochi, JP

2016-10-01 to 2022-03-31 | Scientist (Kochi Institute for Core Sample Research)
Employment
Source: Self-asserted source
Keishi Okazaki

Brown University: Providence, RI, US

2014-04-01 to 2016-09-31 | Postdoctoral Research Associate (Department of Earth, Environmental and Planetary Sciences)
Employment
Source: Self-asserted source
Keishi Okazaki

Hiroshima University: Higashi-Hiroshima, Hiroshima, JP

2013-04-01 to 2014-03-31 | JSPS Research Fellow (Department of Earth and Planetary Systems Science)
Employment
Source: Self-asserted source
Keishi Okazaki

Brown University: Providence, RI, US

2013-04-01 to 2014-03-31 | Visiting Scholar (Department of Earth, Environmental and Planetary Sciences)
Employment
Source: Self-asserted source
Keishi Okazaki

Education and qualifications (2)

Hiroshima University: Higashi-Hiroshima, Hiroshima, JP

2010-04-01 to 2013-03-23 | Ph.D. (Department of Earth and Planetary Systems Science)
Education
Source: Self-asserted source
Keishi Okazaki

Hiroshima University: Higashi-Hiroshima, Hiroshima, JP

2008-04-01 to 2010-03-23 | Master (Department of Earth and Planetary Systems Sciences)
Education
Source: Self-asserted source
Keishi Okazaki

Works (41)

Fault–fracture mesh development produces tectonic tremor in fluid-overpressured serpentinized mantle wedge

Communications Earth & Environment
2025-03-05 | Journal article | Author
DOI: 10.1038/s43247-025-02159-7
Part of ISSN: 2662-4435
Contributors: Ken-ichi Hirauchi; Yurina Nagata; Keishi Okazaki
Source: Self-asserted source
Keishi Okazaki

Plate Interface Shear Zone in the Sanbagawa Metamorphic Belt, Constrained by RSCM Thermometry, U–Pb Zircon Dating and Phase Equilibria Modelling in the Sarutagawa Region, Central Shikoku, Japan

Journal of Metamorphic Geology
2025-02-10 | Journal article | Author
DOI: 10.1111/jmg.12807
Part of ISSN: 0263-4929
Part of ISSN: 1525-1314
Contributors: Samuele Papeschi; Kenta Kawaguchi; Keishi Okazaki; Yasutaka Hayasaka; Takehiro Hirose
Source: Self-asserted source
Keishi Okazaki

Near-infrared focused heating method for the rotational diamond anvil cell

Review of Scientific Instruments
2024-07-01 | Journal article | Author
DOI: 10.1063/5.0202913
Part of ISSN: 0034-6748
Part of ISSN: 1089-7623
Contributors: Shintaro Azuma; Keishi Okazaki; Kentaro Uesugi; Masahiro Yasutake; Natsui Bunrin; Eranga Jayawickrama; Keiya Ishimori; Yoshiyuki Okuda; Yohan; Ryuichi Nomura
Source: Self-asserted source
Keishi Okazaki

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
2023-06 | Journal article | Author
DOI: 10.1029/2022jb026130
Part of ISSN: 2169-9313
Part of ISSN: 2169-9356
Contributors: Yuya Akamatsu; Kumpei Nagase; Natsue Abe; Keishi Okazaki; Kohei Hatakeyama; Ikuo Katayama
Source: Self-asserted source
Keishi Okazaki

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
2023-06 | Journal article | Author
DOI: 10.1029/2022gc010792
Part of ISSN: 1525-2027
Part of ISSN: 1525-2027
Contributors: Yuya Akamatsu; Ikuo Katayama; Keishi Okazaki; K. Michibayashi
Source: Self-asserted source
Keishi Okazaki

A history of mild shocks experienced by the regolith particles on hydrated asteroid Ryugu

Nature Astronomy
2023-04-20 | Journal article | Author
DOI: 10.1038/s41550-023-01947-5
Part of ISSN: 2397-3366
Contributors: Naotaka Tomioka; Akira Yamaguchi; Motoo Ito; Masayuki Uesugi; Naoya Imae; Naoki Shirai; Takuji Ohigashi; Makoto Kimura; Ming-Chang Liu; Richard C. Greenwood et al.
Source: Self-asserted source
Keishi Okazaki

Role of mantle carbonation in trench outer‐rise region in the global carbon cycle

Island Arc
2023-01 | Journal article | Author
DOI: 10.1111/iar.12499
Part of ISSN: 1038-4871
Part of ISSN: 1440-1738
Contributors: Ikuo Katayama; Keishi Okazaki; Atsushi Okamoto
Source: Self-asserted source
Keishi Okazaki

Development of Lattice‐Preferred Orientations of MgO Periclase From Strain Rate Controlled Shear Deformation Experiments Under Pressure up to 120 GPa

Geophysical Research Letters
2022-11-16 | Journal article | Author
DOI: 10.1029/2022gl100178
Part of ISSN: 0094-8276
Part of ISSN: 1944-8007
Contributors: Yohan; Shintaro Azuma; Keishi Okazaki; Kentaro Uesugi; Masahiro Yasutake; Yu Nishihara; Ryuichi Nomura
Source: Self-asserted source
Keishi Okazaki

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
2022-07-26 | Journal article | Writing - original draft, Writing - review & editing, Methodology
DOI: 10.1073/pnas.2119462119
Part of ISSN: 0027-8424
Part of ISSN: 1091-6490
Contributors: Keishi Okazaki
Source: Self-asserted source
Keishi Okazaki

Simultaneous Measurements of Elastic Wave Velocity and Porosity of Epidosites Collected From the Oman Ophiolite: Implication for Low VP/VS Anomaly in the Oceanic Crust

Geophysical Research Letters
2022-06-16 | Journal article | Writing - original draft, Writing - review & editing
DOI: 10.1029/2022gl098234
Part of ISSN: 0094-8276
Part of ISSN: 1944-8007
Contributors: Keishi Okazaki
Source: Self-asserted source
Keishi Okazaki

Listvenite Formation During Mass Transfer into the Leading Edge of the Mantle Wedge: Initial Results from Oman Drilling Project Hole BT1B

Journal of Geophysical Research: Solid Earth
2022-02 | Journal article
DOI: 10.1029/2021jb022352
Part of ISSN: 2169-9313
Part of ISSN: 2169-9356
Source: Self-asserted source
Keishi Okazaki

Effects of Alteration and Cracks on the Seismic Velocity Structure of Oceanic Lithosphere Inferred From Ultrasonic Measurements of Mafic and Ultramafic Samples Collected by the Oman Drilling Project

Journal of Geophysical Research: Solid Earth
2021-11 | Journal article
DOI: 10.1029/2021jb021923
Part of ISSN: 2169-9313
Part of ISSN: 2169-9356
Source: Self-asserted source
Keishi Okazaki

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
2021-11-05 | Journal article
DOI: 10.1029/2021jb022719
Part of ISSN: 2169-9313
Part of ISSN: 2169-9356
Source: Self-asserted source
Keishi Okazaki

Crack geometry of serpentinized peridotites inferred from onboard ultrasonic data from the Oman Drilling Project

Tectonophysics
2021-09 | Journal article
DOI: 10.1016/j.tecto.2021.228978
Part of ISSN: 0040-1951
Source: Self-asserted source
Keishi Okazaki

The Role of Post‐Shock Heating by Plastic Deformation During Impact Devolatilization of Calcite (CaCO 3 )

Geophysical Research Letters
2021-04-16 | Journal article
DOI: 10.1029/2020gl091130
Part of ISSN: 0094-8276
Part of ISSN: 1944-8007
Source: Self-asserted source
Keishi Okazaki

Rheology of the Fluid Oversaturated Fault Zones at the Brittle‐Plastic Transition

Journal of Geophysical Research: Solid Earth
2021-02 | Journal article
DOI: 10.1029/2020jb020804
Part of ISSN: 2169-9313
Part of ISSN: 2169-9356
Source: Self-asserted source
Keishi Okazaki

Deformation of mafic schists from subducted oceanic crust at high pressure and temperature conditions

Tectonophysics
2020 | Journal article
DOI: 10.1016/j.tecto.2019.228217
EID:

2-s2.0-85075214296
Contributors: Okazaki, K.; Hirth, G.
Source: Self-asserted source
Keishi Okazaki via Scopus - Elsevier

Permeability Profiles Across the Crust‐Mantle Sections in the Oman Drilling Project Inferred From Dry and Wet Resistivity Data

Journal of Geophysical Research: Solid Earth
2020-08 | Journal article
DOI: 10.1029/2019jb018698
Part of ISSN: 2169-9313
Part of ISSN: 2169-9356
Source: Self-asserted source
Keishi Okazaki

An inhomogeneous across-slab conduit controlled by intraslab stress heterogeneity in the Nankai subduction zone

Scientific Reports
2019 | Journal article
DOI: 10.1038/s41598-018-38142-w
EID:

2-s2.0-85060915503
Contributors: Otsubo, M.; Miyakawa, A.; Katayama, I.; Okazaki, K.
Source: Self-asserted source
Keishi Okazaki via Scopus - Elsevier

Fracture-induced pore fluid pressure weakening and dehydration of serpentinite

Tectonophysics
2019 | Journal article
DOI: 10.1016/j.tecto.2019.228168
EID:

2-s2.0-85070273584
Contributors: E French, M.; Hirth, G.; Okazaki, K.
Source: Self-asserted source
Keishi Okazaki via Scopus - Elsevier

Dehydration of lawsonite could directly trigger earthquakes in subducting oceanic crust

Nature
2016 | Journal article
DOI: 10.1038/nature16501
EID:

2-s2.0-84957602618
Source: Self-asserted source
Keishi Okazaki
grade
Preferred source (of 2)‎

Slow stick slip of antigorite serpentinite under hydrothermal conditions as a possible mechanism for slow earthquakes

Geophysical Research Letters
2015 | Journal article
DOI: 10.1002/2014GL062735
EID:

2-s2.0-84924910357
Source: Self-asserted source
Keishi Okazaki
grade
Preferred source (of 2)‎

Unstable fault slip induced by lawsonite dehydration in blueschist: Implication for the seismicity in the subducting oceanic crusts

2015 AGU Fall Meeting
2015 | Conference abstract
Source: Self-asserted source
Keishi Okazaki

Deformation Experiments on Blueschist and Greenschist: Implications for the Rheology of Subducted Oceanic Crust

AGU Fall Meeting Abstracts
2014 | Conference abstract
Source: Self-asserted source
Keishi Okazaki

Permeability, porosity and pore geometry evolution during compaction of Neogene sedimentary rocks

Journal of Structural Geology
2014 | Journal article
DOI: 10.1016/j.jsg.2013.12.010
EID:

2-s2.0-84893059691
Source: Self-asserted source
Keishi Okazaki
grade
Preferred source (of 2)‎

Effect of pore fluid pressure on the frictional strength of antigorite serpentinite

Tectonophysics
2013 | Journal article
DOI: 10.1016/j.tecto.2012.10.017
EID:

2-s2.0-84871524515
Source: Self-asserted source
Keishi Okazaki
grade
Preferred source (of 2)‎

Rheological property of mafic schist and geological interpretation to the subduction dynamics

AGU Fall Meeting Abstracts
2013 | Conference abstract
Source: Self-asserted source
Keishi Okazaki

Shear-induced permeability anisotropy of simulated serpentinite gouge produced by triaxial deformation experiments

Geophysical Research Letters
2013 | Journal article
DOI: 10.1002/grl.50302
EID:

2-s2.0-84876889885
Source: Self-asserted source
Keishi Okazaki
grade
Preferred source (of 2)‎

Slow earthquakes associated with fault healing on a serpentinized plate interface

Scientific reports
2013 | Journal article
DOI: 10.1038/srep01784
EID:

2-s2.0-84877734018
Source: Self-asserted source
Keishi Okazaki
grade
Preferred source (of 2)‎

Strengthening of synthetic quartz-rich sediments during time-dependent compaction due to pressure solution-precipitation compaction creep

AGU Fall Meeting Abstracts
2013 | Conference abstract
Source: Self-asserted source
Keishi Okazaki

Can surface samples be used to infer underground permeability structure? A test case for a Neogene sedimentary basin in Horonobe, Japan

International Journal of Rock Mechanics and Mining Sciences
2012 | Journal article
DOI: 10.1016/j.ijrmms.2012.06.012
EID:

2-s2.0-84864942014
Source: Self-asserted source
Keishi Okazaki
grade
Preferred source (of 2)‎

Episodic tremor and slow slip potentially linked to permeability contrasts at the Moho

Nature Geoscience
2012 | Journal article
DOI: 10.1038/ngeo1559
EID:

2-s2.0-84866979680
Source: Self-asserted source
Keishi Okazaki
grade
Preferred source (of 2)‎

Shear-induced permeability anisotropy of simulated serpentinite gouge

AGU Fall Meeting Abstracts
2012 | Conference abstract
Source: Self-asserted source
Keishi Okazaki

Water accumulation and pore pressure build-up in mantle wedge due to permeability barrier

AGU Fall Meeting Abstracts
2012 | Conference abstract
Source: Self-asserted source
Keishi Okazaki

An Effect of pore pressure on slip strength of serpentinite

AGU Fall Meeting Abstracts
2011 | Conference abstract
Source: Self-asserted source
Keishi Okazaki

Estimation of permeability in depth of a single fracture in Neogene mudstone by using laboratory measurements

J. MMIJ
2011 | Journal article
Source: Self-asserted source
Keishi Okazaki

On the transient response of serpentine (antigorite) gouge to stepwise changes in slip velocity under high-temperature conditions

Journal of Geophysical Research: Solid Earth
2011 | Journal article
DOI: 10.1029/2010JB008062
EID:

2-s2.0-80054985227
Source: Self-asserted source
Keishi Okazaki
grade
Preferred source (of 2)‎

Permeability anisotropy of serpentinite and fluid pathways in a subduction zone

Geology
2011 | Journal article
DOI: 10.1130/G32173.1
EID:

2-s2.0-80053982126
Contributors: Kawano, S.; Katayama, I.; Okazaki, K.
Source: Self-asserted source
Keishi Okazaki via Scopus - Elsevier

Permeability anisotropy of serpentinite and fluid pathways in a subduction zone

AGU Fall Meeting Abstracts
2011 | Conference abstract
Source: Self-asserted source
Keishi Okazaki

蛇紋岩の透水率異方性と沈み込み帯での流体移動

日本鉱物科学会年会講演要旨集
2011 | Conference abstract
Source: Self-asserted source
Keishi Okazaki

流体が存在する条件での岩石の弾性波速度測定

日本地質学会学術大会講演要旨
2010 | Conference abstract
Source: Self-asserted source
Keishi Okazaki

Peer review (6 reviews for 5 publications/grants)

Review activity for Communications earth & environment. (1)
Review activity for Nature communications (2)
Review activity for Nature geoscience. (1)
Review activity for Physics and chemistry of minerals. (1)
Review activity for Tectonophysics. (1)
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