Details of the Researcher

PHOTO

Kazumasa Sueyoshi
Section
Graduate School of Environmental Studies
Job title
Assistant Professor
Degree

  • 博士（理学）（広島大学）

  • 修士（理学）（広島大学）

e-Rad No.
20965107

Research History 5

  • 2023/01 - Present
    Tohoku University　Graduate School of Environmental Studies Department of Environmental Studies for Advanced Society

  • 2022/04 - 2022/12
    Kyoto University　Graduate School of Science Institute for Geothermal Sciences

  • 2020/04 - 2022/03
    産業技術総合研究所地質調査総合センター　地圏資源環境研究部門地圏メカニクス研究グループ　第七号契約職員（リサーチアシスタント）

  • 2019/09 - 2022/03
    産業技術総合研究所地質調査総合センター　地圏資源環境研究部門地圏メカニクス研究グループ　技術研究員

  • 2019/09 - 2020/01
    産業技術総合研究所地質調査総合センター　地圏資源環境研究部門地圏メカニクス研究グループ　第七号契約職員（リサーチアシスタント）

Education 2

  • Hiroshima University　Graduate School of Science　Department of Earth and Planetary Systems Science

    2017/04 - 2022/03

  • Hiroshima University　Faculty of Science　Earth and Planetary Systems Science

    2013/04 - 2017/03

Research Interests 3

  • アコースティックエミッション（AE）

  • 流体移動

  • 岩石力学

Research Areas 1

  • Natural sciences / Solid earth science /

Awards 1

  1. Outstanding Student Presentation Award

    2021/02　American Geophysical Union

Papers 7

  1. Creating multidirectional fractures through particle jamming Peer-reviewed

    Yusuke Mukuhira, Ryota Goto, Noriaki Watanabe, Kazumasa Sueyoshi, Kohei Takuma, Rongchang Zhang, Tongfei Tian, Vladimir Sokolovski, Makoto Naoi, Yuko Arai, Takaaki Tomai, Masaoki Uno, Takatoshi Ito

    International Journal of Rock Mechanics and Mining Sciences　188　106051-106051　2025/04

    Publisher: Elsevier BV

    DOI： 10.1016/j.ijrmms.2025.106051 　

    ISSN： 1365-1609

  2. Vulnerability of Mechanical Properties of Rocks Generated by Rapid Decompression Fracturing Under Hydrothermal Conditions

    Kazumasa Sueyoshi, Satoshi Aoshima, Kenta Takagi, Katsuya Mizuno, Nobuo Hirano, Noriyoshi Tsuchiya

    Rock Mechanics and Rock Engineering　2025/03/21

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1007/s00603-025-04468-x 　

    ISSN： 0723-2632

    eISSN： 1434-453X

    More details Close

    Abstract The buildup and release of fluid pressure within faults play an important role in the changes in tectonic stress and fault strength during the interseismic period. In particular, the extremely rapid decrease in fluid pressure associated with dilational jog formation due to fault slip is termed flash vaporization and has been recognized as a driver of mineralization. Although rapid hydrothermal decompression associated with the phase change of fluids can cause cracking within the rock in the vicinity of the fault, the effect of cracks induced by rapid hydrothermal decompression on the microstructure and physical properties of rock remains unclear. In this study, laboratory experiments were conducted to investigate rapid decompression under high-temperature and high-pressure conditions. The experiments were performed at a temperature of 180–610 ℃ and a pressure of 3.6–50.6 MPa on granitic rocks. The rock samples and distilled water were sealed in the chamber, and the chamber was heated to create a hydrothermal environment. After heating, rapid hydrothermal decompression was achieved by opening a valve connected to the interior of the chamber. The porosity of the granite samples increased by rapid hydrothermal decompression and was significantly greater than that of samples subjected to natural cooling. The microstructural observations based on X-ray computed tomography images showed that fractures occurred on surfaces in contact with water, indicating clear heterogeneity in fracture distribution. In addition, the shear modulus decreased significantly upon hydrothermal decompression. These results indicated that localized areas with high crack densities and low shear moduli on the fault plane can be created by seismic slip.

  3. Characteristics and effectiveness of water-assisted CO2 fracturing for creating geothermal reservoirs in volcanic rocks

    Eko Pramudyo, Kohei Takuma, Yuto Watanabe, Kiyotoshi Sakaguchi, Yutaro Maeda, Sho Ogata, Kazumasa Sueyoshi, Jiajie Wang, Kazumi Osato, Amane Terai, Noriaki Watanabe

    Geoenergy Science and Engineering　213280-213280　2024/09

    Publisher: Elsevier BV

    DOI： 10.1016/j.geoen.2024.213280 　

    ISSN： 2949-8910

  4. Permeability enhancement by CO2 injection and chelating agent stimulation for creating geothermal reservoirs in granite

    Eko Pramudyo, Luis Salalá, Ryota Goto, Jiajie Wang, Kazumasa Sueyoshi, Lena Muhl, Kiyotoshi Sakaguchi, Noriaki Watanabe

    Geoenergy Science and Engineering　2024/03

    DOI： 10.1016/j.geoen.2023.212586 　

  5. Permeability evolution in fine‐grained Aji granite during triaxial compression experiments

    Kazumasa Sueyoshi, Ikuo Katayama, Kazuki Sawayama

    Geophysical Prospecting　2024/02

    DOI： 10.1111/1365-2478.13412 　

  6. Identification of fracturing behavior in thermally cracked granite using the frequency spectral characteristics of acoustic emission

    Kazumasa SUEYOSHI, Manami KITAMURA, Xinglin LEI, Ikuo KATAYAMA

    Journal of Mineralogical and Petrological Sciences　2023/04

    Publisher: Japan Association of Mineralogical Sciences

    DOI： 10.2465/jmps.221014 　

    ISSN： 1345-6296

    eISSN： 1349-3825

  7. Experimental Measurement of the Transport Flow Path Aperture in Thermally Cracked Granite and the Relationship between Pore Structure and Permeability

    Kazumasa Sueyoshi, Tadashi Yokoyama, Ikuo Katayama

    Geofluids　2020　1-10　2020/11/07

    Publisher: Hindawi Limited

    DOI： 10.1155/2020/8818293 　

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Presentations 13

  1. CO2 and water injection-induced shear-slip of fracture in volcanic rock under geothermal environment

    Kazumasa Sueyoshi, Eko Pramudyo, Koki Miyazaki, Kiyotoshi Sakaguchi, Sho Ogata, Kazumi Osato, Amane Terai, Noriaki Watanabe

    American Geophysical Union 2025　2024/12/13

  2. Water-assisted CO2 fracturing for creating geothermal reservoirs in volcanic rocks

    Yuto Watanabe, Eko Pramudyo, Kiyotoshi Sakaguchi, Yutaro Maeda, Sho Ogata, Kazumasa Sueyoshi, Jiajie Wang, Kazumi Osato, Amane Terai, Noriaki Watanabe

    American Geophysical Union 2025　2024/12/13

  3. The effect of transport property of super-critical CO2 along igneous rock fracture on shear-slip behavior

    2024/11/26

  4. Characteristics of CO2 injection-induced shearing of fractures in volcanic rocks

    Kazumasa Sueyoshi, Eko Pramudyo, Koki Miyazaki, Kiyotoshi Sakaguchi, Sho Ogata, Kazumi Osato, Amane Terai, Noriaki Watanabe

    The 4th International Conference on Coupled Processes in Fractured Geological Media: Observation, Modeling and Application　2024/11/13

  5. Slip characteristics of fault damaged by rapid decompression under hydrothermal conditions

    Asumi Matsumiya, Kazumasa Sueyoshi, Eko Pramudyo, Nobuo Hirano, Noriyoshi Tsuchiya

    Japan Geoscience Union Meeting 2024　2024/05/28

  6. Transport properties of fluid at rock fractures generated by rapid decompression under hydrothermal conditions

    Japan Geoscience Union Meeting 2023　2023/05/21

  7. Experimental investigation on fault reactivation by water injection and the relationship between slip characteristics and injection rate

    Kazumasa Sueyoshi, Manami Kitamura, Xinglin Lei, Ikuo Katayama

    Japan Geoscience Union　2022/05/23

  8. Frequency characteristics of acoustic emission in the fracture process of thermally cracked granite

    Kazumasa Sueyoshi, Manami Kitamura, Xinglin Lei, Ikuo Katayama

    Japan Geoscience Union　2021/06/05

  9. Frequency characteristics of acoustic emission in thermally cracked granite

    Kazumasa Sueyoshi, Manami Kitamura, Xinglin Lei, Ikuo Katayama

    American Geophysical Union　2020/12/16

  10. Experimental results of b-value for AE events of thermally cracked granite during triaxial compression test

    Kazumasa Sueyoshi, Xinglin Lei, Manami Kitamura, Ikuo Katayama

    American Geophysical Union　2019/12/12

  11. Experimental measurements of transport pore radius of thermally cracked granite and the relationship of pore structure to permeability

    Kazumasa Sueyoshi, Tadashi Yokoyama, Ikuo Katayama

    Japan Geoscience Union　2019/05/30

  12. Experimental study on relationship between permeability and transport pore radius of sandstones

    Kazumasa Sueyoshi, Tadashi Yokoyama, Ikuo Katayama

    American Geophysical Union Fall Meeting　2018/12/12

  13. Real time measurements of permeability of Aji granite during triaxial compression tests

    Kazumasa Sueyoshi, Ikuo Katayama

    2017/05/23

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