Peter B. Kelemen , Juan Carlos de Obeso , James A. Leong , Marguerite Godard , Keishi Okazaki , Alissa J. Kotowski , Craig E. Manning , Eric T. Ellison , Manuel D. Menzel , Janos L. Urai , Greg Hirth , Matthew Rioux , Daniel F. Stockli , Romain Lafay , Andreas M. Beinlich , Jude A. Coggon , Nehal H. Warsi , Jurg M. Matter , Damon A.H. Teagle , Michelle Harris , Katsuyoshi Michibayashi , Eiichi Takazawa , Zaher Al Sulaimani. 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, 127, doi: 10.1029/2021JB022352
K. Okazaki, K. Michibayashi, K. Hatakeyama, N. Abe, K. Johnson, P. Kelemen. 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, 126, p. e2021JB022719, doi: 10.1029/2021JB022719
Hatakeyama, K., Katayama, I., Abe, N., Okazaki, K., Michibayashi, K., and the Oman Drilling Project Science Party. 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, 126, doi: 10.1029/2021JB021923
Keishi Okazaki, Eric Burdette, Greg Hirth. Rheology of the Fluid Oversaturated Fault Zones at the Brittle-Plastic Transition. JOURNAL OF GEOPHYSICAL RESEARCH - Solid Earth, 2021, 126, 2, doi: 10.1029/2020JB020804
長瀬薫平、片山郁夫、畠山航平、赤松祐哉、岡崎啓史、阿部なつ江、道林克禎、横山正. オマーンオフィオライト陸上掘削試料を用いたハードロック掘削における空隙率測定法の再検討. 地質学雑誌, 2020, 126, 12, p. 713-717, doi: 10.5575/geosoc.2020.0043
Ikuo Katayama, Natsue Abe, Kohei Hatakeyama, Yuya Akamatsu, Keishi Okazaki, Ole Ivar Ulven, Gilbert Hong, Wenlu Zhu, Benoit Cordonnier, Katsuyoshi Michibayashi, Marguerite Godard, Peter Kelemen. 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, 125, p. 1-9, doi: 10.1029/2019JB018698
Keishi Okazaki, Greg Hirth. Deformation of mafic schists from subducted oceanic crust at high pressure and temperature conditions. TECTONOPHYSICS, 2019, 774, 5, doi: 10.1016/j.tecto.2019.228217
Melodie E French, Greg Hirth, Keishi Okazaki. Fracture-induced pore fluid pressure weakening and dehydration of serpentinite. TECTONOPHYSICS, 2019, 767, doi: 10.1016/j.tecto.2019.228168
Makoto Otsubo, Ayumu Miyakawa, Ikuo Katayama, Keishi Okazaki. An inhomogeneous across-slab conduit controlled by intraslab stress heterogeneity in the Nankai subduction zone. Scientific Reports, 2019, 9, doi: 10.1038/s41598-018-38142-w
PB Kelemen, R Aines, E Bennett, SM Benson, E Carter, JA Coggon, JC de Obeso, O Evans, G Gadikota, GM Dipple, M Godard, M Harris, JA Higgins, KTM Johnson, F Kourim, R Lafay, S Lambart, CE Manning, JM Matter, K Michibayashi, T Morishita, J Noel, K Okazaki, P Renforth, B Robinson, H Savage, R Skarbek, MW Spiegelman, E Takazawa, D Teagle, JL Urai, J Wilcox. In situ carbon mineralization in ultramafic rocks: Natural processes and possible engineered methods. Energy Procedia, 2018, 146, p. 92-102, doi: 10.1016/j.egypro.2018.07.013
査読無し(JAMSTECでの成果)
Kelemen, P.B., Matter J.M., Teagle, D.A.H., Coggon, J.A., and the Oman Drilling Project Science Team. Oman Drilling Project: Scientific Drilling in the Samail Ophiolite, Sultanate of Oman. Proceedings of the Oman Drilling Program/International Ocean Discovery Program, 2020, doi: 10.14379/OmanDP.proc.2020
Keishi Okazaki, Katsuyoshi Michibayashi, Kohei Hatakeyama, Natsue Abe, Kevin T.M. Johnson, Peter B Kelemen, Oman Drilling Project Phase I Science Party. Major mineral mode of listvenite from ICDP Oman Drilling Project Hole BT1B inferred from X-ray CT core images. JpGU-AGU Joint Meeting 2020, 2020
Kosuke Kurosawa, Hidenori Genda, Shintaro Azuma, Keishi Okazaki. An overlooked heat source in impact events and its effect on the degree of devolatilization of natural calcite carbonates. JpGU-AGU Joint Meeting 2020, 2020
Peter B Kelemen、Juan de Obeso、Craig Manning、Marguerite Godard、Wolfgang Bach、Merry Yue Cai、Saebyul Choe、Judith Coggon、Eric Ellison、Alireza Eslami、Katy Evans、Michelle Harris、Wolf-Achim Kah、Jürg Matter、Katsu Michibayashi、Keichi Okazaki、Philippe Pézard、Damon A.H. Teagle、Alexis Templeton、Oman Drilling Project Science Team. Peridotite alteration in OmanDP cores. 日本地球惑星科学連合2019年大会, 2019
Keishi Okazaki. Experimental investigation of dehydration weakening and embrittlement of hydrous minerals. Intermediate and Deep Earthquakes: Observation and Modeling /College de France, 2018
Peter B Kelemen, JC deObeso, M Godard, KTM Johnson, K Okazaki, CE Manning, JL Urai,K Michibayashi, M Harris, J Coggon, J Matter, E Takazawa10, DAH Teagle, Oman Drilling Project Phase I Science Party. Peridotite carbonation at the leading edge of the mantle wedge: OmanDP Site BT1. JpGU 2018[SCG54-12], 2018
Greg Hirth, Keishi Okazaki, Brooks Proctor. The Role of Fluid Distribution on Fault Strength at Deformation Conditions near the Brittle-Plastic Transition. AGU fallmeeting 2017, 2017, p. T52C-04
岡崎 啓史、Hirth Greg. Deformation experiment on quartz aggregates with high water contents at high pressure and temperature. JpGU-AGU2017 / SSS17-22, 2017
口頭発表(JAMSTECでの成果)
岡崎 啓史、道林 克禎、畠山 航平、阿部 なつ江、Johnson Kevin、Kelemen Peter. Mineral mode of listvenite from ICDP Oman Drilling Project Hole BT1B inferred from X-ray CT core images. JpGU2021 / SCG41-04, 2021
Kohei Hatakeyama, Ikuo Katayama, Natsue Abe, Keishi Okazaki, Katsuyoshi Michibayashi, The Oman Drilling Project Science Party. Velocity gradient in the oceanic crust layer 3 based on seismic velocity of cores drilled from the Oman ophiolite. JpGU-AGU Joint Meeting 2020, 2020
Keishi Okazaki, Eric Burdette, Greg Hirth. Rheology of the fluid oversaturated simulated quartz shear zone at the brittle-ductile transition. JpGU-AGU Joint Meeting 2020, 2020
Satish C. Singh, Venkata Vaddineni, Vaibhav Ingale, Keishi Okazaki, The Oman Drilling Project Phase 2 Science Party. Mohorovicic Discontinuity: What we know, what we don't know, and what should be done?. International Conference on Ophiolites and the Oceanic Lithosphere: Results of the Oman Drilling Project and Related Research, 2020
Keishi Okazaki, Katsuyoshi Michibayashi, Kohei Hatakeyama, Natsue Abe, Kevin T.M. Johnson, Peter B. Kelemen, the Oman Drilling Project Phase I Science Part. Mineral assemblages of listvenite from ICDP Oman Drilling Project Hole BT1B inferred from X-ray CT core images. International Conference on Ophiolites and the Oceanic Lithosphere: Results of the Oman Drilling Project and Related Research, 2020
Peter B. Kelemen, Wolfgang Bach, Andreas Beinlich, Merry Cai, Saebyul Choe, Jude Coggon, Juan Carlos de Obeso, Eric Ellison, Alireza Eslami, Katy Evans, Marguerite Godard, Michelle Harris, Greg Hirth, Wolf Achim Kahl, Benjamin Malvoisin, Craig Manning, Jürg Matter, Katsu Michibayashi, Keishi Okazaki, Philippe Pezard, Damon Teagle, Alexis Templeton, Janos Urai, Wenlu Zhu, the Oman Drilling Project Science Team. Alteration of Peridotite in the Samail Ophiolite: Results from the Oman Drilling Project. International Conference on Ophiolites and the Oceanic Lithosphere: Results of the Oman Drilling Project and Related Research, 2020
Peter B. Kelemen, Wolfgang Bach, Andreas Beinlich, Juan Carlos de Obeso, Greg Hirth, Craig Manning, Katsu Michibayashi, Keishi Okazaki, Janos Urai, Wenlu Zhu, the Oman Drilling Project Science Team. Ductile deformation of listvenite, OmanDP Site BT1, Samail Ophiolite. International Conference on Ophiolites and the Oceanic Lithosphere: Results of the Oman Drilling Project and Related Research, 2020
Ikuo Katayama, Natsue Abe, Keishi Okazaki, Kohei Hatakeyama, Yuya Akamatsu, Katsuyoshi Michibayashi, Marguerite Godard, Peter Kelemen, The Oman Drilling Project Phase 2 Science Party. Crack density and aspect ratio of serpentinized dunites and harzburgites in the Hole BA1B, 3A, and 4A inferred from onboard ultrasonic velocity data. International Conference on Ophiolites and the Oceanic Lithosphere: Results of the Oman Drilling Project and Related Research, 2020
Keishi Okazaki, Eric Burdette, Greg Hirth. Rheology of the fluid oversaturated quartz shear zone at the brittle-ductile transition. AGU Fall Meeting 2019, 2019
Keishi Okazaki, Eric Burdette, Greg Hirth. Effects of the aqueous fluid and porosity on the rheology of quartz aggregates at the brittle-plastic transition. AGU Fall Meeting 2018 / MR23A-06, 2018
Ikuo Katayama, Keishi Okazaki, Natsue Abe, Ole Ivar Ulven, Gilbert Hong, Wenlu Zhu, Benoit Cordonnier, Kohei Hatakeyama, Yuya Akamatsu, Katsuyoshi Michibayashi, Marguerite Godard, Peter B Kelemen. Permeability profile across the crust-mantle sections in the Oman Drilling Project inferred from onboard measurements of dry and wet resistivity. AGU Fall Meeting 2018 / V12B-04, 2018
Katsuyoshi Michibayashi, Ikuo Katayama, Peter B Kelemen, Keishi Okazaki, Marguerite Godard, Eiichi Takazawa, Damon A H Teagle. Quantification of the downhole degree of serpentinization estimated by X-ray CT core imaging (Oman Drilling Project Phase 2, D/V CHIKYU). AGU Fall Meeting 2018 / V12B-01, 2018
Keishi Okazaki, Natsue Abe, Kohei Hatakeyama, Yuya Akamatsu, Eiichi Takazawa, Damon A H Teagle, Peter B Kelemen, Judith A. Coggon. Physical property of the fossilized crust-mantle transition zone from ICDP Oman Drilling Project Hole CM1A and CM2B. AGU Fall Meeting 2018 / V11B-03, 2018
阿部なつ江、岡崎啓史、畠山航平、Benoit Ildefonse、立石大和、James Andrew Leong、道林克禎、高澤栄一、Peter Kelemen、Juan Calros de Obeso、Damon Teagle、 Jude Coggon、Michelle Harris. ICDPオマーン陸上掘削第1期(ChikyuOman2017)岩石物性~海洋底から衝上まで~. 日本鉱物科学会2018年会(山形大学), 2018
Keishi Okazaki, Eric Burdette, Greg Hirth. Rheology of the fluid-overpressured quartz shear zone at the brittle-plastic transition: effects of the aqueous fluid and porosity. JpGU 2018[SCG53-24], 2018
Keishi Okazaki, Kohei Hatakeyama, Natsue Abe, James Andrew Leong, Katsuyoshi Michibayashi, Peter B Kelemen, Michelle Harris, Oman Drilling Project Phase 1 Science Party. Initial studies on the physical property measurement of listvenite, serpentinite and the metamorphic sole from ICDP Oman Drilling Project Hole BT1B. JpGU 2018[SCG54-14], 2018
Katsuyoshi Michibayashi, Keishi Okazaki, James Andrew Monton Leong, Peter B Kelemen, Kevin Johnson, Rebecca N Greenberger, Craig E Manning, Michelle Harris, Juan Carlos deObeso, Natsue Abe, Kohei Hatakeyama, Benoit Ildefonse, Eiichi TAKAZAWA, Damon A H Teagle, Jude Ann Jude. X-ray CT core imaging of Oman Drilling Project on D/V CHIKYU. JpGU 2018[SCG54-01], 2018
Katsuyoshi Michibayashi, Keishi Okazaki, James Andrew Monton Leong, Peter B Kelemen, Kevin T M Johnson, Rebecca N Greenberger, Craig E Manning, Michelle Harris, Juan Carlos de Obeso, Natsue Abe, Kohei Hatakeyama, Benoit Ildefonse, Eiichi Takazawa, Damon A H Teagle, Jude Ann Coggon. X-ray CT core imaging of Oman Drilling Project on D/V CHIKYU. AGU fallmeeting 2017 / V24E-01, 2017
Peter B Kelemen, Marguerite Godard , Kevin T M Johnson , Keishi Okazaki, Craig E Manning , Janos L Urai , Katsu Michibayashi, Michelle Harris, Jude Ann Coggon, Damon A H Teagle, The Oman Drilling Project Phase I Science Party. Peridotite carbonation at the leading edge of the mantle wedge: OmDP Site BT1. AGU fallmeeting 2017 / V24E-06, 2017
Pathikrit Bhattacharya, Allan M Rubin, Terry E Tullis, Keishi Okazaki, Nicholas M Beeler. Where did the time go? Friction evolves with slip following large velocity steps, normal stress steps, and (?) during long holds. American Geophysical Union Fall Meeting /S14B-08, 2016
Yuya Akamatsu ,IKUO KATAYAMA,Keishi Okazaki, Michibayashi Katsuyoshi、Oman Drilling Project Phase I Science Party. Vein permeability structure of the crustal section in the Oman Drilling Project inferred from the X-ray CT image analysis. JpGU2021 / SCG41-P06, 2021
Takehiro Hirose, Ryoichi Nakada, Keishi Okazaki, Takazo Shibuya. Quake-induced redox change in the interior of planets. AGU fall meeting 2020 / P042-0016, 2020
Natsue Abe, Keishi Okazaki, Kohei Hatakeyama, Yuya Akamatsu, Ikuo Katayama, Benoit Ildefonse, Katsuyoshi Michibayashi, Eiichi TAKAZAWA, Damon A H Teagle, Peter B Kelemen, Science Party The Oman Drilling Project. Important role of the ultramafic layers in the lower oceanic crust and Moho. JpGU-AGU Joint Meeting 2020, 2020
KUMPEI NAGASE, Ikuo Katayama, Kohei Hatakeyama, Yuya Akamatsu, Keishi Okazaki, Natsue Abe, Katsuyoshi Michibayashi. Pore geometry in diabase collected by the Oman DP inferred from elastic wave velocity. JpGU-AGU Joint Meeting 2020, 2020
Kumpei Nagase, Ikuo Katayama, Tadashi Yokoyama, Kouhei Hatakeyama, Yuya Akamatsu, Keishi Okazaki, Natsue Abe, Katsuyoshi Michibayashi. Porosity of mafic and ultramafic core samples from the Oman Drilling Projects measured by the penetration and impregnation methods. International Conference on Ophiolites and the Oceanic Lithosphere: Results of the Oman Drilling Project and Related Research, 2020
Katsuyoshi MICHIBAYASHI1, SaebyulChOE, Jude COGGON, Margurette GODARD, Michelle HARRIS, Peter KELEMEN, Jurg Matter, Juan Carlos DE OBESO, Keishi OKAZAKI, Eiichi TAKAZAWA, Damon TEAGLE, the Oman Drilling Project Science Team. X-ray CT core imaging of the Oman Drilling Project on D/V CHIKYU. International Conference on Ophiolites and the Oceanic Lithosphere: Results of the Oman Drilling Project and Related Research, 2020
Kohei Hatakeyama, Ikuo Katayama, Natsue Abe, Keishi Okazaki, The Oman Drilling Project Science Party. Seismic velocity profile across the crust-mantle boundary determined from high-pressure experiments of core samples collected from the Oman Drilling Project. International Conference on Ophiolites and the Oceanic Lithosphere: Results of the Oman Drilling Project and Related Research, 2020
Natsue Abe, Keishi Okazaki, Ikuo Katayama, Kohei Hatakeyama, Benoit Ildefonse, Ole Ivar Ulven, Gilbert Hong, Wenlu Zh7, Benoit Cordonnier, Yuya Akamatsu, Katsuyoshi Michibayashi, Eiichi Takazawa, Michell Harris, Damon Teagle, Peter Kelemen, Marguerite Godard, Jurg Matter, Jude Coggon and The Oman Drilling Project Science Party. Relationship between the physical properties and hydration of the oceanic lower crust/ Moho TZ: results from onboard measurements of ICDP Oman Drilling Project. International Conference on Ophiolites and the Oceanic Lithosphere, 2020
Natue Abe, Kohei Hatakeyama, Keishi Okazaki, James Andrew Leong, Benoit Ildefonse, Yamato Tateishi, Michelle Harris, Katsu Michibayashi, Juan Carlos de Obeso, Damon Teagle, Eiichi Takazawa, Peter Kelemen, Jude Ann Coggon, Juerg Michael Matter and Oman Drilling Project Phase 1 Science Party. Initial studies of the petrophysics in the sheeted dikes and upper gabbro from Oman Drilling Project Hole GT3A. International Conference on Ophiolites and the Oceanic Lithosphere, 2020
Makoto Otsubo, Ayumu Miyakawa, Ikuo Katayama, Keishi Okazaki. An inhomogeneous conduit across slab controlled by spatial heterogeneity of intraslab stress in the Nankai subduction zone, southwestern Japan. AGU Fall Meeting 2019, 2019
Pathikrit Bhattacharya, Allan M Rubin, Terry E Tullis, Nicholas M Beeler, Keishi Okazaki. Where did the time go? The remarkable slip-sensitivity of fault healing at quasi-stationary slip rates. AGU Fall Meeting 2019, 2019
Takehiro Hirose, Ryoichi Nakada, Keishi Okazaki, Takazo Shibuya. Change in redox conditions by a quake in the interior of planets. AGU Fall Meeting 2019 / P11C-3465, 2019
大坪 誠、宮川 歩夢、片山 郁夫、岡崎 啓史. Inhomogeneous conduit across slab controlled by intraslab stress heterogeneity in the Nankai subduction zone. 日本地球惑星科学連合2019年大会, 2019
Takehiro Hirose, Wataru Tanikawa, Yohei Hamada, Keishi Okazaki. A new hydrothermal, low to high speed rotary-shearing apparatus: Reproduction of slow/megathrust earthquakes in laboratory. 日本地球惑星科学連合2019年大会, 2019
岡崎 啓史、阿部 なつ江、畠山 航平、赤松 祐哉、片山 郁夫、高澤 栄一、Damon Teagle、Peter Kelemen、Jude Coggon、Oman Drilling Prj Ph2 Sci. Party. Physical property of the fossilized crust-mantle transition zone from ICDP Oman Drilling Project Hole CM1A and CM2B measured onboard D/V Chikyu. 日本地球惑星科学連合2019年大会, 2019
片山 郁夫、岡崎 啓史、阿部 なつ江、Ulven Ole Ivar、Hong Gilbert、Zhu Wenlu、Cordonnier Benoit、畠山 航平、赤松 祐哉、道林 克禎、Godard Marguerite、Kelemen Peter、The Oman Drilling Project Phase 2 Science Party. Permeability profile in the Oman Drilling Project inferred from resistivity measurements. 日本地球惑星科学連合2019年大会, 2019
Natsue Abe, Keishi Okazaki, Ikuo Katayama, Kohei Hatakeyama, Ole Ivar Ulven, Gilbert Hong, Wenlu Zhu, Benoit Cordonnier, Yuya Akamatsu, Katsuyoshi Michibayashi, Eiichi Takazawa, Marguerite Godard, Teagle Damon, Peter Kelemen, Juerg Michael Matter, Jude Ann Coggon and The Oman Drilling Project Phase II Science Party. Initial report of physical property measurements, ChikyuOman 2018: Crust-Mantle boundary and the mantle section from ICDP Oman Drilling Project Phase II. AGU Fall Meeting 2018, 2018
Keishi Okazaki, Natsue Abe, Kohei Hatakeyama, Benoit Ildefonse, James Andrew Monton Leong, Yamato Tateishi, Damon A H Teagle, Eiichi Takazawa, Peter B Kelemen, Katsuyoshi Michibayashi, Jude Ann Coggon, Michelle Harris, Juan Carlos de Obeso. Initial report of the physical property measurement, ChikyuOman core description Phase I: sheeted dike and gabbro boundary from ICDP Holes GT1A, GT2A and GT3A. AGU fallmeeting 2017 / V43G-2951, 2017
Kohei Hatakeyama, Keishi Okazaki, Natsue Abe, James Andrew Monton Leong, Katsuyoshi Michibayashi, Peter B Kelemen, Michelle Harris. Initial results on the physical property measurement of ChikyuOman cores: listvenite, serpentinite and the metamorphic sole from ICDP Hole BT1B. AGU fallmeeting 2017 / V43G-2943, 2017
Eric Burdette, Keishi Okazaki, Greg Hirth,. The Role of Compliance and Reaction Rate in Dehydration Weakening and Frictional Stability of Antigorite. AGU fallmeeting 2017 / T41D-0655, 2017
Melodie E French, Greg Hirth, Keishi Okazaki. The constitutive behavior of antigorite gouge under fluid-saturated undrained conditions. AGU fallmeeting 2017 / MR21B-0449, 2017
岡崎 啓史、Hirth Greg、片山 郁夫. Experimental investigation of dehydration weakening and embrittlement of antigorite serpentinite and possible mechanisms to induce various fault slip behaviors in subduction zones. JpGU-AGU2017 / SCG66-P05, 2017
Greg Hirth, Keishi Okazaki, Brooks Proctor. Experimental investigation of processes responsible for dehydration weakening and embrittlement. American Geophysical Union Fall Meeting / T21D-2870, 2016
Keishi Okazaki, Greg Hirth. Deformation Experiment on Quartz Aggregates with High Porosity and High Water Contents at High Pressure and Temperature. American Geophysical Union Fall Meeting /S41B-2780, 2016
ポスター発表招待(JAMSTECでの成果)
Ikuo Katayama, Natsue Abe, Keishi Okazaki, Kohei Hatakeyama, Yuya Akamatsu, Katsuyoshi Michibayashi, Marguerite Godard, Peter B Kelemen, Phase 2 Science Party The Oman Drilling Project. Crack aspect ratio in the serpentinized peridotites inferred from onboard ultrasonic data by the Oman Drilling Projects. JpGU-AGU Joint Meeting 2020, 2020