Updated on 2025/06/12

写真a

 
KUBO TOMOAKI
 
Organization
Faculty of Science Department of Earth and Planetary Sciences Professor
The Kyushu University Museum (Concurrent)
School of Sciences Department of Earth and Planetary Sciences(Concurrent)
Graduate School of Sciences Department of Earth and Planetary Sciences(Concurrent)
Title
Professor
Contact information
メールアドレス
Profile
We study dynamics of Earth and planetary interiors based on experimental mineral physics at high pressure. D-111 and D-DIA type high-pressure deformation apparatuses are used to study "deep rock dynamics" such as transformation kinetics, rheology, and their interactions in deep Earth materials and planetary ices, combined with AE measurements and in-situ X-ray observations at synchrotron facilities of SPring-8 and Photon Factory. Recent research topics include transformation-induced superplasticity and water weakening of deep slab, and transformation faulting and dehydration embrittlement for the origin of deep earthquakes, internal dynamics of icy moons, and non-equilibrium high-pressure transformations in shocked meteorites and diamond inclusions.
External link

Research Areas

  • Natural Science / Solid earth sciences

Degree

  • Doctor of Science

Research History

  • 1999年4月-2004年3月 東北大学大学院理学研究科 助手   

Education

  • Tohoku University    

Research Interests・Research Keywords

  • Research theme: Deep earthquakes and slab weakening induced by deep Earth water

    Keyword: dehydration embrittlement, water weakening, serpentine, DHMS, fluid, water in NAMs

    Research period: 2022.4 - Present

  • Research theme: In-situ X-ray observations of reaction and deformation coupling with high-spatiotemporal resolutions

    Keyword: pink beam, high spatiotemporal resolution, in-situ observation, deformation, faulting, reaction kinetics

    Research period: 2021.4 - Present

  • Research theme: Transformation-induced deep earthquakes and deep slab weakening

    Keyword: mantle transition zone, transformational faulting, superplasticity, grain-size reduction, shear localization, shear instability

    Research period: 2016.4 - Present

  • Research theme: Synchrotron radiation study of deformation, faulting, and reaction kinetics in deep rock analogue materials at high pressure

    Keyword: MA-type high-pressure deformation experiment, synchrotron radiation, AE measurement

    Research period: 2011.4 - Present

  • Research theme: Shocked meteorites and non-equilibrium transformations

    Keyword: early solar system, parent body, shock history, formation of metastable phase, diamond inclusion

    Research period: 2006.4 - Present

  • Research theme: Rheological properties of deep Earth rocks and planetary ices at high pressures

    Keyword: plastic deformation, grain growth, atomic diffusion, mantle convection, icy moons

    Research period: 2004.4 - Present

  • Research theme: Kinetics of high-pressure transformations in deep Earth rocks and planetary ices

    Keyword: transformation mechanisms, transformation kinetics, slab stagnation, synchrotron radiation, electron microscopy

    Research period: 2004.4 - Present

Awards

  • 平成 22 年度日本鉱物科学会論文賞

    2011.9   日本鉱物科学会   Masayuki NISHI, Tomoaki KUBO and Takumi KATO (2009) Metastable transformations of eclogite to garnetite in subducting oceanic crust. Journal of Mineralogical and Petrological Sciences, 104, 192-198.

  • 日本高圧力学会奨励賞

    2006.11   日本高圧力学会  

  • 文部科学大臣表彰 若手科学者賞

    2006.4   文部科学省  

  • アメリカ地球物理学連合(AGU)鉱物物理学若手研究者賞

    1999.12   アメリカ地球物理学連合(AGU)  

  • 青葉理学振興賞

    1999.3   東北大学理学部  

Papers

  • Curious kinetic behavior in silica polymorphs solves seifertite puzzle in shocked meteorite Reviewed International journal

    T. KUBO, T. Kato, Y. Higo, K. Funakoshi

    Sci. Adv. 1, e1500075 (2015). DOI: 10.1126/sciadv.1500075   388   2015.5

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    Language:English   Publishing type:Research paper (scientific journal)  

  • Creep behavior during the eutectoid transformation of albite: Implications for the slab deformation in the lower mantle Reviewed International journal

    N. Doi, T. Kato, T. Kubo, M. Noda, R. Shiraishi, A. Suzuki, E. Ohtani, T. Kikegawa

    EARTH AND PLANETARY SCIENCE LETTERS   388   2014.2

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.epsl.2013.09.009

  • Slow Si-Al interdiffusion in garnet and stagnation of subducting slabs Reviewed International journal

    M. NIshi, Tomoaki KUBO, T. Ohfuji, Takumi Kato, Y. Nishihara, T. Irifune

    EARTH AND PLANETARY SCIENCE LETTERS   361   2013.1

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.epsl.2012.11.022

  • Geophysical and mineralogical constraints on the post-spinel transformation for the Tonga slab Reviewed International journal

    S. Kaneshima, T. Kubo, S. Yoshioka

    PHYSICS OF THE EARTH AND PLANETARY INTERIORS   196   2012.4

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.pepi.2012.02.009

  • Exsolution kinetics of majoritic garnet from clinopyroxene in subducting oceanic crust Reviewed International journal

    M. Nishi, Tomoaki KUBO, Takumi Kato, A. Tominaga, K. Funakoshi, Y. Higo

    PHYSICS OF THE EARTH AND PLANETARY INTERIORS   189 ( 1-2 )   2011.11

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.pepi.2011.07.002

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Books

  • 高圧力の科学・技術事典(入舩他 編)「地球内部物性:相転移カイネティクス」

    久保友明(Role:Joint author)

    朝倉書店  2022.11 

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    Language:Japanese   Book type:Scholarly book

  • 高圧力の科学・技術事典(入舩他 編)「放射光測定:プレス実験」

    桂智男、肥後祐司、芳野極、久保友明・坂巻竜也、寺崎英紀(Role:Joint author)

    朝倉書店  2022.11 

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    Language:Japanese   Book type:Scholarly book

  • 高圧力の科学・技術事典(入舩他 編)「地球内部物性:相転移カイネティクス」

    久保 友明

    朝倉書店  2022 

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    Total pages:458  

    CiNii Research

  • 鉱物・宝石の科学事典(日本鉱物科学会 編)「地球深部鉱物のレオロジーとカイネティクス」

    安東淳一、久保友明、山崎大輔(Role:Joint author)

    朝倉書店  2019.8 

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    Language:Japanese   Book type:Scholarly book

  • 図説地球科学の事典(鳥海他 編)「変形・破壊と地球内部のダイナミクス」

    久保友明(Role:Joint author)

    朝倉書店  2018.4 

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    Language:Japanese   Book type:Scholarly book

Presentations

  • In-situ X-ray observations of creep behavior during the olivine-spinel transformation in fayalite International conference

    T. Kubo, N. Doi, M. Imamura, T. Kato, Y. Higo and Y. Tange

    American Geophysical Union 2016 Fall Meeting  2016.12 

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    Event date: 2016.12

    Language:English   Presentation type:Oral presentation (general)  

    Venue:San Francisco   Country:United States  

  • Simultaneous observations of reaction kinetics, creep behavior, and AE activities during syndeformational antigorite dehydration at high pressures International conference

    久保友明, 岩里拓弥, 肥後祐司, T. Kato, 上原 誠一郎, 金嶋 聰, Y. Tange

    American Geophysical Union 2015 Fall Meeting  2015.12 

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    Event date: 2015.12

    Language:English   Presentation type:Oral presentation (general)  

    Venue:San Francisco   Country:United States  

  • Flow behaviors and AE activities during syndeformational antigorite dehydration at high pressures International conference

    岩里拓弥, 久保友明, 肥後祐司, T. Kato, 金嶋 聰, 上原 誠一郎, Y. Tange

    日本地球惑星連合2015年度大会  2015.5 

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    Event date: 2015.5

    Language:English   Presentation type:Oral presentation (general)  

    Venue:幕張   Country:Japan  

  • 高圧下でのシリカおよび斜長石の非平衡相転移に基づく隕石の衝撃条件の制約

    久保友明, 河野真利, T. Kato

    日本地球惑星連合2014年度大会  2014.4 

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    Event date: 2014.4 - 2014.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:新潟   Country:Japan  

  • 放射光単色X線とAE6-6システムを用いた高圧下におけるantigoriteの脱水反応と変形挙動のその場同時観察

    岩里拓弥, 久保友明, 肥後祐司, T. Kato, 金嶋 聰, 上原 誠一郎, 今村公裕

    日本地球惑星連合2014年度大会  2014.4 

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    Event date: 2014.4 - 2014.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:新潟   Country:Japan  

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MISC

  • An in-situ X-ray diffraction study on the high-pressure decomposition reaction of albite under differential stresses

    N. Doi, T. Kato, T. Kubo, R. Shiraishi, A. Suzuki, A. Shimojuku, K. Nishida, E. Ohtani, T. Kikegawa

    Photon Factory Activity Report 2008   2009.5

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    Language:English   Publishing type:Internal/External technical report, pre-print, etc.  

  • Crystallization kinetics of high-pressure phases from amorphous plagioclase

    T. Kubo, M. Kimura, T. Kato, M. Nishi, A. Tominaga, T. Kikegawa

    Photon Factory Activity Report 2008 #26 Part A, 46-47, 2009   2009.5

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    Language:English   Publishing type:Internal/External technical report, pre-print, etc.  

  • Time-resolved 2D-XRD observations of the olivine-wadsleyite transformation

    T. Kubo, A. Shimojuku, M. Nishi, T. Kato, T. Kikegawa

    Photon Factory Activity Report 2008 #26 Part B, 190, 2009   2009.5

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    Language:English  

  • High pressure deformation experiments using deformation-Cubic Anvil, D-CAP 700, with synchrotron X rays

    R. Shiraishi, E. Ohtani, T. Kubo, A. Suzuki, N. Doi, A. Shimojuku, T. Kikegawa

    Photon Factory Activity Report 2008 #26 Part B, 180, 2009   2009.5

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    Language:English   Publishing type:Internal/External technical report, pre-print, etc.  

  • 氷天体内部対流運動の物質科学 −氷の粘性流動と高圧相転移—

    久保友明

    低温科学   2008.6

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

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Professional Memberships

  • 日本鉱物科学会

  • 日本惑星科学会

  • 日本高圧力学会

  • American Geophysical Union

  • Mineralogical Society of America

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Committee Memberships

  • PFユーザーアソシエーション (PF-UA)   Steering committee member   Domestic

    2021.4 - 2027.3   

  • 日本高圧力学会   Organizer   Domestic

    2019.9 - 2021.9   

  • 日本高圧力学会   庶務幹事   Domestic

    2019.9 - 2021.9   

  • 日本高圧力学会   Organizer   Domestic

    2012.9 - 2014.9   

  • 日本高圧力学会   渉外幹事   Domestic

    2012.9 - 2014.9   

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Academic Activities

  • Screening of academic papers

    Role(s): Peer review

    2023

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:1

    Number of peer-reviewed articles in Japanese journals:1

    Proceedings of International Conference Number of peer-reviewed papers:0

    Proceedings of domestic conference Number of peer-reviewed papers:0

  • 座長

    第63回高圧討論会  ( Japan ) 2022.12

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    Type:Competition, symposium, etc. 

    Number of participants:200

  • Screening of academic papers

    Role(s): Peer review

    2022

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:1

    Number of peer-reviewed articles in Japanese journals:0

    Proceedings of International Conference Number of peer-reviewed papers:0

    Proceedings of domestic conference Number of peer-reviewed papers:0

  • 座長

    第62回高圧討論会  ( Japan ) 2021.10

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    Type:Competition, symposium, etc. 

    Number of participants:200

  • Screening of academic papers

    Role(s): Peer review

    2021

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:2

    Number of peer-reviewed articles in Japanese journals:0

    Proceedings of International Conference Number of peer-reviewed papers:0

    Proceedings of domestic conference Number of peer-reviewed papers:0

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Research Projects

  • マントル遷移層スラブの脱水脆性化と加水軟化に関する実験的研究

    Grant number:24H00274  2024 - 2027

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

    久保 友明, 本田 陸人, 辻野 典秀, 富岡 尚敬, 坪川 祐美子

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    Authorship:Principal investigator  Grant type:Scientific research funding

    地球マントル対流を理解する鍵となるマントル遷移層に沈み込む海洋プレート(遷移層スラブ)の力学挙動には、深発地震発生と冷たいスラブの軟化という2つの未解決問題があり、そこには水と相転移が深く関わっている。本研究では水が関与する重要プロセス(脱水脆性化と加水軟化)に焦点をあて、次世代放射光による変形-反応その場観察手法とFIB-TEMによる極微小領域観察技術を駆使した実験研究を行う。これまで取り組んできた相転移が関与する重要プロセス(相転移断層形成と超塑性流動)とあわせて、遷移層で観測される多様なスラブ形状と深発地震分布を、水と相転移の両面から物質科学的に解明することを目指す。

    CiNii Research

  • 結晶粒ダイナミクスのその場観察:PT型マントル対流における岩石流動研究の新展開

    Grant number:22K18282  2022 - 2025

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Challenging Research(Pioneering)

    久保 友明, 肥後 祐司, 坪川 祐美子

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    Authorship:Principal investigator  Grant type:Scientific research funding

    地球独自で駆動するプレートテクトニクス型マントル対流を理解するうえで、高圧相転移が支配する岩石の粒径進化と塑性流動のカップリングは極めて重要なプロセスであるが、大部分の岩石は実際に入手できないためその解明は非常に困難である。本挑戦的研究では粒径進化を支配するカイネティクスの正確な理解に焦点をあて、材料科学の新規手法と最新の高圧変形実験技術、次世代放射光技術といった異分野を融合し、地球深部に相当する高圧変形場でX線の回折斑点を使って個々の結晶粒の動的挙動を追跡する新たな実験手法を開発する。

    CiNii Research

  • 観測と物性実験の融合による地震火山研究の新展開

    2020 - 2024

    大学改革活性化制度(部局改革推進枠)

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    Authorship:Principal investigator  Grant type:On-campus funds, funds, etc.

  • Experimental study on syn-deformational reaction processes at high pressures: Implications for slab weakening and deep earthquakes

    Grant number:18H05232  2018 - 2022

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (S)

    Kubo Tomoaki

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    Authorship:Principal investigator  Grant type:Scientific research funding

    Reaction-deformation coupling in deep rocks are potentially important processes to understand the plate-tectonic mantle convection in the Earth. We developed high-pressure deformation techniques with D-DIA and D-111 type multi-anvil devices, which enables us to conduct in-situ observations of the coupling processes up to lower mantle pressures combined with synchrotron radiation at PF-AR NE7A and SPring-8 BL04B1 beamlines. Based on these techniques, we clarified the processes of the reaction-induced shear instability and rheological weakening associated with the olivine-spinel and the post-spinel transformations. We also found that the two-stage post-spinel transformation and the post-garnet transformation have important roles on the slab rheology. These findings give a new perspective on deep slab dynamics including deep earthquakes, slab stagnation, and MORB segregation around the upper and lower mantle boundary.

    CiNii Research

  • ガス惑星の大移動は生まれたてのS型小惑星を破壊したのか?

    Grant number:18H01269  2018 - 2021

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    宮原 正明, 平田 岳史, 寺田 健太郎, 久保 友明, 山口 亮, 関根 利守

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    Authorship:Coinvestigator(s)  Grant type:Scientific research funding

    原始太陽系が誕生して間もない頃,原始木星・土星といった巨大ガス惑星が太陽系内を大きく往復移動し,この惑星大移動が引き起こした重力散乱は,小惑星同士の衝突を誘発したと推測されている。本研究計画は,小惑星の欠片である隕石試料を用いて,衝突の痕跡である高圧鉱物やコンドリュールの変形組織等を用いて,小惑星の破壊のメカニズムやプロセスを明らかにし,“ガス惑星は小惑星の壊し屋であったか?”を検証した。

    CiNii Research

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Educational Activities

  • Introduction to Solid Earth and Deep Earth Materials Sciences
    Introduction to Experimental Studies in Earth and Planetary Sciences
    Rock and Mineral Physics
    Synchrotron Radiation Studies in Earth and Planetary Sciences

Class subject

  • 地球惑星内部科学B

    2024.12 - 2025.2   Winter quarter

  • 地球惑星科学IIb

    2024.12 - 2025.2   Winter quarter

  • 最先端地球科学

    2024.6 - 2024.8   Summer quarter

  • 鉱物物性科学

    2024.4 - 2024.9   First semester

  • 固体地球科学

    2024.4 - 2024.9   First semester

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FD Participation

  • 2019.12   Role:Participation   Title:緊急時の応急措置に関するFD/SD~エピペン及びAEDについて~

    Organizer:[Undergraduate school/graduate school/graduate faculty]

  • 2016.8   Role:Participation   Title:クオーター制に関する検討

    Organizer:Undergraduate school department

  • 2014.12   Role:Planning   Title:大学の制度変更にどう対応するか

    Organizer:Undergraduate school department

  • 2013.12   Role:Participation   Title:新カリキュラムと地球惑星科学科専攻教育

    Organizer:Undergraduate school department

  • 2013.3   Role:Participation   Title:基幹教育院の新カリキュラムについて

    Organizer:Undergraduate school department

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Visiting, concurrent, or part-time lecturers at other universities, institutions, etc.

  • 2018  国立大学法人神戸大学  Classification:Part-time lecturer  Domestic/International Classification:Japan 

    Semester, Day Time or Duration:前期

  • 2014  国立大学法人広島大学  Classification:Part-time lecturer  Domestic/International Classification:Japan 

    Semester, Day Time or Duration:前期

  • 2011  国立大学法人愛媛大学  Classification:Part-time lecturer  Domestic/International Classification:Japan 

    Semester, Day Time or Duration:前期

Other educational activity and Special note

  • 2015  Class Teacher  学部

  • 2007  Class Teacher  学部

Social Activities

  • 講演 「放射光と超高圧発生装置を用いた地下深部の研究」

    日本非破壊検査協会九州支部第3回技術サロン  九州機械工業振興会  2019.11

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    Audience:General, Scientific, Company, Civic organization, Governmental agency

    Type:Seminar, workshop

  • 氷天体と岩石天体の比較惑星学

    九州大学教員免許状更新講習  2017.8

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    Audience:Infants, Schoolchildren, Junior students, High school students

    Type:Seminar, workshop

  • 講演「深発地震の解明に向けた高圧下における物質の相変態と変形挙動の同時その場観察技術の開発」

    新事業創出に向けた九州大学テクノロジーフォーラム2014/九州大学産学官連携本部  東京国際フォーラム  2014.12

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    Audience:General, Scientific, Company, Civic organization, Governmental agency

    Type:Lecture

  • 熱くて重くて軟らかい氷? 〜氷天体内部の不思議な世界〜

    九州大学オープンキャンパス  2008.8

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    Audience:Infants, Schoolchildren, Junior students, High school students

    Type:Seminar, workshop

  • 公開講座の企画 「スタグナントスラブ−東アジアの沈み込み帯から探る地球の今−」

    九州大学大学院理学研究院・科研費特定領域研究 地球深部スラブ  エルガーラ中ホール(福岡)  2005.11

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    Audience:General, Scientific, Company, Civic organization, Governmental agency

    Type:Lecture

Media Coverage

  • 「九大、超高密度シリカが月や火星起源隕石に存在する理由を明らかに」 Newspaper, magazine

    財経新聞  2015.5

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    「九大、超高密度シリカが月や火星起源隕石に存在する理由を明らかに」

  • 「隕石に含まれる結晶、惑星への衝突示す 九大」 Newspaper, magazine

    日本経済新聞  2015.5

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    「隕石に含まれる結晶、惑星への衝突示す 九大」

  • 「ダイア 時速60kmで地表へ」 Newspaper, magazine

    熊本日日新聞  2010.6

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    「ダイア 時速60kmで地表へ」

  • 「氷の星、内部は軟らか、九大助教授ら実験」 Newspaper, magazine

    朝日新聞  2006.3

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    「氷の星、内部は軟らか、九大助教授ら実験」

Acceptance of Foreign Researchers, etc.

  • 九州大学

    Acceptance period: 2020.12 - 2022.3   (Period):1 month or more

    Nationality:China

  • シカゴ大学

    Acceptance period: 2018.10   (Period):Less than 2 weeks

    Nationality:United States

    Business entity:On-campus funds

  • カリフォルニア大学バークレー校

    Acceptance period: 2018.6   (Period):Less than 2 weeks

    Nationality:United States

  • Laboratoire de Géologie, Ecole Normale Supérieure de Paris

    Acceptance period: 2017.5   (Period):Less than 2 weeks

    Nationality:France

    Business entity:Japan Society for the Promotion of Science

  • MIT

    Acceptance period: 2012.3   (Period):Less than 2 weeks

    Nationality:United States

    Business entity:On-campus funds

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Travel Abroad

  • 2016.8

    Staying countory name 1:United Kingdom   Staying institution name 1:University College London

  • 2012.9

    Staying countory name 1:China   Staying institution name 1:北京大学

  • 2011.9

    Staying countory name 1:United States   Staying institution name 1:MIT

  • 2010.7 - 2010.8

    Staying countory name 1:United States   Staying institution name 1:MIT

  • 2008.3

    Staying countory name 1:United States   Staying institution name 1:MIT

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