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Development of numerical models on explosive volcanic eruptions

Research Project

Project/Area Number 14540388
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 固体地球物理学
Research InstitutionThe University of Tokyo

Principal Investigator

KOYAGUCHI Takehiro  The University of Tokyo, Earthquake Research Institute, Professor, 地震研究所, 教授 (80178384)

Project Period (FY) 2002 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 2004: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2003: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2002: ¥1,300,000 (Direct Cost: ¥1,300,000)
Keywordsvolcanic eruption / numerical model / magma ascent / eruption cloud / pyroclastic flow / multiphase fluid dynamics
Research Abstract

Numerical models of eruption cloud and conduit flow were developed in order to link the dynamics of explosive eruption and field observations in the pyroclastic deposits. The following 3 results were obtained.
(1)Development of a 3-D numerical code of eruption cloud
3-dimensional turbulence plays an essential role in mixing between eruption cloud and surrounding air, and hence, the dynamics of eruption cloud. It has been shown that such turbulent mixing can be correctly reproduced by our numerical code where 3-D coordinate and the third order accuracy with high spatial resolution are employed.
(2)Development of a coupled model of bubble nucleation-growth and conduit dynamics
A coupled model of microscopic bubble nucleation-growth and macroscopic conduit dynamics has been developed, using the cell model (a model where bubbly flow is approximated as an aggregate of bubbles with shell of incompressible viscous or viscoelasitc materials). The model enables us to predict the dependence of viscosity on magma fragmentation and timing of bubble nucleation and bubble size-distribution in magma during explosive eruptions.
(3)Reconstruction of detailed eruption sequence for actual explosive eruptions.
Eruption sequence of the Asama 1783 eruption was reconstructed on the basis of detailed geological survey and petrological investigation for the ejecta as well as analyses of old documents. The results show that the Asama 1783 eruption is characterized by simultaneous generation of explosive eruption cloud and clastogenic lava flow, and that such an eruption style is explained by relatively low degree of magma fragmentation (coarse grain-size of the ejecta) during this eruption.

Report

(4 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • 2002 Annual Research Report
  • Research Products

    (14 results)

All 2005 2004 2002 Other

All Journal Article (12 results) Publications (2 results)

  • [Journal Article] The effect of magma flow on nucleation of gas bubbles in a volcanic conduit2005

    • Author(s)
      Massol, H., Koyaguchi, T.
    • Journal Title

      Journal of Volcanology and Geothermal Research (印刷中)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] An analytical study for 1-dimensional steady flow in volcanic conduits2005

    • Author(s)
      Koyaguchi, T.
    • Journal Title

      Journal of Volcanology and Geothermal Research (印刷中)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Journal Article] A numerical study of turbulent mixing in eruption clouds using a 3-D fluid dynamics model2005

    • Author(s)
      Y.J Suzuki 他
    • Journal Title

      Journal of Geophysical Research (印刷中)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] The effect of magma flow on nucleation of gas bubbles in a volcanic2005

    • Author(s)
      Massol, H., Koyaguchi, T.
    • Journal Title

      Journal of Volcanology and Geothermal Research (印刷中)

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Sequence and eruptive style of the 1783 eruption of Asama Volcano, Central Japan : A case study of an andesitic explosive eruption generating fountain-fed lava, pumice fall, scoria flow and forming a cone2004

    • Author(s)
      Yasui, M., Koyaguchi, T.
    • Journal Title

      Bulletin of Volcanology 66

      Pages: 243-262

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Sequence and eruptive style of the 1783 eruption of Asama Volcano, Central Japan : A case study of an andesitic explosive eruption generating fountain-fed lava, pumice fall, scoria flow and forming a cone2004

    • Author(s)
      M., Yasui, T.Koyaguchi
    • Journal Title

      Bulletin of Volcanology 66

      Pages: 243-262

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Sequence and Eruptive Style of the 1783 Eruption of Asama Volcano, Central Japan : A case study of an andesitic explosive eruption generating fountain-fed lava, pumice fall, scoria flow and forming a cone2004

    • Author(s)
      Yasui, M., Koyaguchi, T.
    • Journal Title

      Bulletin of Volcanology 66

      Pages: 243-262

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Measurements of electric charge distribution in volcanic plumes at Sakurajima Volcano, Japan.2002

    • Author(s)
      T.Miura 他
    • Journal Title

      Bulletin of Volcanology 64

      Pages: 75-93

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Measurements of electric charge distribution in volcanic plumes at Sakurajima Volcano, Japan.2002

    • Author(s)
      T.Miura, T.Koyaguchi, Y.Tanaka
    • Journal Title

      Bulletin of Volcanology 64

      Pages: 75-93

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] The effect of magma flow on nucleation of gas bubbles in a volcanic conduit

    • Author(s)
      H.Massol, T.Koyaguchi
    • Journal Title

      Journal of Volcanology and Geothermal Research (in press)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] An analytical study for 1-dimensional steady flow in volcanic Conduits

    • Author(s)
      T.Koyaguchi
    • Journal Title

      Journal of Volcanology and Geothermal Research (in press)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] A numerical study of turbulent mixing in eruption clouds using a 3-D fluid dynamics model

    • Author(s)
      Y.J Suzuki, T.Koyaguchi, M.Ogawa, I.Hachisu
    • Journal Title

      Journal of Geophysical Research (in press)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Publications] M.Yasui, T.Koyaguchi: "Sequence and Eruptive Style of the 1783 Eruption of Asama Volcano, Central Japan."Bulletin of Volcanology. 印刷中. (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] T.Miura 他: "Measurements of electric charge distribution in volcanic plumes at Sakurajima Volcano, Japan"Bulletin of Volcanology. 64. 75-93 (2002)

    • Related Report
      2002 Annual Research Report

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Published: 2002-04-01   Modified: 2016-04-21  

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