Details of the Researcher

PHOTO

Sora Nishikawa
Section
Graduate School of Science
Job title
Assistant Professor
Degree

  • Doctor of Philosophy (Hokkaido University)

Research History 3

  • 2026/08 - Present
    Tohoku University　Graduate School of Science Department of Geophysics　Assistan Professor

  • 2026/04 - 2026/07
    Tohoku University　Graduate School of Science Department of Geophysics　Specially Appointed Research Fellow

  • 2025/10 - 2026/03
    Tohoku University　Graduate School of Science Department of Geophysics　Research Fellow

Education 3

  • Hokkaido University　Graduate School of Science　Department of Natural History Sciences Doctor's course

    2022/04 - 2025/09

  • Hokkaido University　Graduate School of Science　Department of Natural History Sciences Master's Course

    2020/04 - 2022/03

  • Hokkaido University　School of Science　Department of Earth and Planetary Sciences

    2016/04 - 2020/03

Professional Memberships 2

  • The Volcanological Society of Japan

    2020/03 - Present

  • Japan Geoscience Union

    2017/05 - Present

Research Interests 5

  • Physical volcanology

  • Volcanic eruption

  • Conduit deformation

  • Conduit flow

  • magma

Research Areas 1

  • Natural sciences / Solid earth science / Volcanology

Papers 1

  1. Coupled model of overpressure-driven dike deformation and volcanic conduit flow: implications for non-uniform dike deformation during effusive eruptions Peer-reviewed

    Sora Nishikawa, Ryo Tanaka

    Earth, Planets and Space　78　(1)　2026/01/15

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1186/s40623-025-02344-0 　

    eISSN： 1880-5981

    More details Close

    Abstract Interactions between the elastic magma chamber and the variable flow resistance of conduits control volcanic eruptions. Recent geodetic observations have revealed complex conduit deformations, especially in inclined dikes, which traditional models have struggled to capture. In this study, we introduce a simplified coupled model that explicitly accounts for magma flow within a nonuniform, elastically deformable inclined dike conduit under the influence of edifice loading. Dimensional analysis reduces the governing equations to an advection–diffusion type equation, controlled by two key dimensionless parameters representing the relative deformability of the conduit and the contribution of gravitational and pressure gradient forces. Numerical simulations demonstrate that these parameters govern the regime of pressure propagation. Specifically, deformation driven by large overpressure can significantly increase effusion rates and induce response delays between different depths. Applying this model to the 2018 Kilauea eruption, we show that the observed response delays and the spatial pattern of deformation (simultaneous expansion and contraction) are well-reproduced in a regime, where advective effects dominate. Our findings provide a refined theoretical framework for understanding volcanic conduit behavior in complex geometries and could explain observed non-uniform deformation phenomena. Graphical abstract

Misc. 7

  1. Development of a coupled model for conduit flow in viscoelastic deformable conduit

    Nishikawa Sora, Tanaka Ryo

    Geophysical bulletin of Hokkaido University　88　17-32　2025/03

    DOI： 10.14943/gbhu.88.17 　

  2. Report of the Study Meeting for Young Volcanologist 2022 in Hokkaido-Komagatake volcano, Japan

    Sora Nishikawa, Miki Hamamoto, Asami Honda, Kazunori Zushida, Taiga Seito

    BULLETIN OF THE VOLCANOLOGICAL SOCIETY OF JAPAN　68　(2)　991-104　2023/03

    DOI： 10.18940/kazan.68.2_99 　

  3. Numerical study of the relationship conduit geometry and flow Satibility

    西川空良, 田中良

    日本地球惑星科学連合大会予稿集(Web)　2023　2023

  4. Remote determinations of fumarolic temperatures from H2 in volcanic plumes sampled by using drones

    宮木裕崇, 角皆潤, 伊藤昌稚, 渡部紘平, 中川書子, 田中良, 西川空良, 寺田暁彦

    日本火山学会講演予稿集　2022　2022

    ISSN： 2433-5320

  5. Numerical study on the quasi-periodic behavior of effusive eruption and its application to the 1991-1995 eruption of Mt. Unzen

    西川空良, 田中良

    日本地球惑星科学連合大会予稿集(Web)　2022　2022

  6. Transition of effusive eruption implied from 1D conduit flow model considering conduit deformation and magma properties change

    西川空良, 田中良

    日本火山学会講演予稿集　2021　2021

    ISSN： 2433-5320

  7. Active Seismic Source Experiment in Sakurajima Volcano in 2019 and Comparison with the Previous Experiments

    中道治久, 山本圭吾, 山田大志, 為栗健, 高橋幸祐, 青山裕, 山本希, 野上健治, 及川純, 前田裕太, 大倉敬宏, 松島健, 八木原寛, 菅原道智, 塚本果織, 岸本博志, 工藤直樹, 山村卓也, 平原聡, 八木健夫, 堀川信一郎, 吉川慎, 園田忠臣, 仲谷幸浩, 平野舟一郎, 宮町宏樹, 田中佑樹, 吉田英臣, 西川空良, 甲斐建, 高橋龍平, 田ノ上和志, 川辺智士, 若林環, 村松弾, 橋本匡, 大須賀啓士

    京都大学防災研究所年報(CD-ROM)　(63)　2020

    ISSN： 0386-412X

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Presentations 8

  1. Mathematical modeling of summit caldera collapse with dike deformation

    Sora Nishikawa

    JpGU-AGU Joint Meeting 2026　2026/05/27

  2. ダイク変形を伴う山頂カルデラ陥没現象の数理的研究

    西川空良

    地震研究所共同利用研究集会「火山現象のダイナミクス・素過程研究」　2026/03/17

  3. 火道流とダイク変形の連成した準定常モデルに基づく非爆発的噴火の推移の数値的研究

    西川空良, 田中良

    地震研究所共同利用研究集会「火山現象のダイナミクス・素過程研究」　2025/03/12

  4. 火道流とダイクの変形の連成計算に基づく非爆発的噴火の推移の数値的研究

    西川空良, 田中良

    2024/05/26

  5. 噴火の安定性における火道形状の影響

    西川空良, 田中良

    日本地球惑星科学連合2023年大会　2023/05/25

  6. Numerical simulation of the quasi-periodic behavior of effusive eruption and its application to the 1991-1995 eruption of Mt. Unzen

    Sora Nishikawa, Ryo Tanaka

    The IAVCEI Scientific Assembly　2023/02/02

  7. 非爆発的噴火の準周期的推移メカニズム解明のための数理モデルの構築と雲仙普賢岳1991-1995年噴火への適用

    西川空良, 田中良

    日本地球惑星科学連合2022年大会　2022/05/26

  8. 火道変形とマグマの物性変化を考慮した非爆発的噴火の推移

    西川空良, 田中良

    日本火山学会2021年大会　2021/10/20

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Research Projects 1

  1. 不確実性を内包した確率的火山噴火モデルを用いた噴火位置予測の高度化

    田中良, 土田旭, 竹内博志, 西川空良, 西村太志

    Offer Organization: 東北大学（文科省火山研究人材育成等支援事業）

    System: 火山研究人材育成等支援事業 （即戦力となる火山人材育成プログラム）

    2026/04 - 2028/03