Updated on 2025/03/17

写真a

 
NAMIKI Atsuko
 
Organization
Graduate School of Environmental Studies Department of Earth and Environmental Sciences Earth and Planetary Physics Associate professor
Graduate School
Graduate School of Environmental Studies
Undergraduate School
School of Science Department of Earth and Planetary Science
Title
Associate professor
Contact information
メールアドレス

Degree 1

  1. Ph. D ( 2002.3 ) 

Research Interests 3

  1. Volcanology

  2. Rheology

  3. Fracture

Research Areas 1

  1. Natural Science / Solid earth sciences  / Volcanology, Earthquake, Rheology

Current Research Project and SDGs 1

  1. Rheology and fragmentation of the molten magma

Awards 1

  1. 特別研究員等審査会専門委員(書面担当)表彰

    2015  

    並木 敦子

 

Papers 38

  1. Crystal-Rich Magma Is Solid-Like and Liquefies When Deformed Reviewed International coauthorship

    Atsuko Namiki, Konan Saito, Satoshi Okumura, Masato Hoshino, Kentaro Uesugi, Kazuhiro Tsukada, Natsuko Takagi, Michael Manga

    Journal of Geophysical Research: Solid Earth   Vol. 130   page: e2024JB030483   2025.2

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: https://doi.org/10.1029/2024JB030483

  2. An Introductory Review of Complex Rheology of Magma for Rheologists Invited Reviewed

    Atsuko Namiki

    Nihon Reoroji Gakkaishi   Vol. 52 ( 5 ) page: 305 - 311   2024.12

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: https://doi.org/10.1678/rheology.52.305

  3. In situ observation of glass-like fragmentation of high-temperature silicate melts generating fine ashes Reviewed

    Namiki, A., Okumura, S., Goto, A., Yamada, T.

    Communications Earth & Environment   Vol. 4   page: 155   2023.5

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: https://doi.org/10.1038/s43247-023-00816-3

  4. Molecular-scale structural changes of silicate melts under tension revealed by time-resolved X-ray diffraction Reviewed

    Okumura S., Uesugi K., Goto A., Namiki A., Matsumoto K., Sakamaki T.

    Chemical Geology   Vol. 621   2023.3

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Chemical Geology  

    The non-Newtonian behavior of silicate melts influences magma flow dynamics in a volcanic conduit. Shear thinning causes a reduction in viscosity and brittle failure induces magma fragmentation, resulting in explosive eruptions that release magma fragments into the surface with volcanic gases. The conditions under which they occur have been investigated by macroscopic rheological experiments; however, the understanding of the molecular-scale origin of shear thinning and brittle failure of silicate melts remains poor, partially because of the experimental difficulty of in situ investigations of molecular-scale melt structures under deformation. In this study, we performed tension experiments for silicate melts at temperatures of 760–840 °C and investigated the melt structure forming intermediate-range ordering using time-resolved X-ray diffraction. Our experiments demonstrate that the contribution of anisotropic elastic deformation to molecular-scale strain increases with increasing stress. The mechanical data for stress relaxation indicate that the relaxation timescale decreases with an increase in stress, implying viscosity reduction with an increase in stress. Based on this, we infer that when the stress is large, the molecular-scale structure elastically dilates in the direction of the deformation under tension, causing a decrease in melt viscosity, and the melt may cause macroscopic failure through local anisotropic dilation and the resultant cavitation. This process seems to depend on experimental geometry, such as tension, compression, and torsion; hence, the relationship between experimental geometry, molecular-scale structure, and non-Newtonian behavior must be further investigated in future studies.

    DOI: 10.1016/j.chemgeo.2023.121372

    Scopus

  5. An Experimental Model of Unconfined Bubbly Lava Flows: Importance of Localized Bubble Distribution Reviewed

    Atsuko Namiki, Einat Lev, Janine Birnbaum, Jasper Baur

    Journal of Geophysical Research: Solid Earth     2022.6

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1029/2022JB024139

    DOI: 10.1029/2022JB024139

    Other Link: https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2022JB024139

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Presentations 12

  1. マグマのレオロジー

    並木 敦子

    第72回レオロジー討論会  2024.10.18 

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    Event date: 2024.10

    Language:Japanese   Presentation type:Oral presentation (general)  

  2. 気泡と結晶を含む低粘度マグマのアナログ引張実験:破壊の様子の観察と火山砕屑物形成の考察

    小田沙也加、並木敦子

    日本火山学会2024年度秋季大会  2024.10.17 

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    Event date: 2024.10

    Language:Japanese   Presentation type:Poster presentation  

  3. 雲仙の溶岩に発達している結晶を取り巻く空隙の可視化

    齋藤虹南、並木敦子

    日本火山学会2024年度秋季大会  2024.10.16 

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    Event date: 2024.10

    Language:Japanese   Presentation type:Poster presentation  

  4. 土曜海山の熔岩に見られる不思議な泡の形状

    並木 敦子、星野 真人、上杉 健太朗、田村 芳彦

    2024.5.31  日本地球惑星科学連合

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    Event date: 2024.5

    Language:Japanese   Presentation type:Poster presentation  

    Venue:幕張   Country:Japan  

  5. 雲仙の溶岩の気泡と結晶の分布の解析:大きな気泡は必ず結晶と一緒に存在するのか?

    齋藤 虹南、並木 敦子、星野 真人、後藤 章夫

    2024.5.29  日本地球惑星科学連合

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    Event date: 2024.5

    Language:Japanese   Presentation type:Poster presentation  

    Venue:幕張   Country:Japan  

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KAKENHI (Grants-in-Aid for Scientific Research) 5

  1. 気泡と結晶を含むマグマの粘弾性と破壊強度の測定及び構造のその場観察

    Grant number:24H00270  2024.4 - 2027.3

    基盤研究(A)

    並木 敦子

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    Grant type:Competitive

    Grant amount:\49530000 ( Direct Cost: \38100000 、 Indirect Cost:\11430000 )

  2. Catastrophic caldera forming eruption revealed by petrological and experimental study of lubrication of crystal-mush

    Grant number:21KK0055  2021.10 - 2024.3

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    Authorship:Coinvestigator(s) 

  3. 火山直下のマグマの状態と将来を知る方法の提案:粘弾性測定と浸透流・破砕の実験

    Grant number:19H00721  2019.4 - 2024.3

    基盤研究(A)

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    Authorship:Principal investigator  Grant type:Competitive

  4. 粘弾性体中で起き得る地震の最大サイズの実測と地震波形の観察:モデル実験と理論

    Grant number:19H04625  2019.4 - 2022.3

    スロー地震学: 新学術領域研究(研究領域提案型)

    並木敦子

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    Authorship:Principal investigator  Grant type:Competitive

  5. Constructing a model of outgassing from basaltic magma based on observations and experiments

    Grant number:17KK0092  2017.4 - 2023.3

    Atsuko Namiki

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    Authorship:Principal investigator  Grant type:Competitive

 

Teaching Experience (On-campus) 13

  1. Earth and Planetary Physics 2

    2024

  2. Fundamentals of Earth Science I

    2024

  3. Introduction to Earth and Planetary Physics

    2024

  4. Geophysics and Planetary Physics Experiments I

    2024

  5. Fundamentals of Earth Science II

    2024

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Social Contribution 3

  1. 火山の爆発的噴火の不思議

    Role(s):Lecturer

    2023.10

  2. 名大MIRAI GSC 講義

    Role(s):Lecturer

    2021.7

  3. 2018年ハワイ島の噴火でわかったマグマの破砕

    Role(s):Lecturer

    2021.6