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1988 Fiscal Year Final Research Report Summary

Elementary Processes of Magmatic Eruption --Mechanisms of Instability and Bubbling in a Partially molten material--

Research Project

Project/Area Number 62420011
Research Category

Grant-in-Aid for General Scientific Research (A)

Allocation TypeSingle-year Grants
Research Field 固体地球物理学
Research InstitutionKobe University

Principal Investigator

FUJII Naoyuki  Faaculty of Science, Kobe University, Professor, 理学部, 教授 (60011631)

Co-Investigator(Kenkyū-buntansha) MIYAMOTO Masamichi  College of General Education, The University of Tokyo, Assistant Professor, 教養学部, 講師 (70107944)
MAEKAWA Hirokazu  Faculty of Sceince, Kobe University,Research Associate, 理学部, 助手 (50173696)
ITO Keisuke  Faculty of Sceince, Kobe University,Professor, 理学部, 教授 (00030792)
UI Tadahide  Faculty of Sceince, Kobe University, Professor, 理学部, 教授 (10007164)
Project Period (FY) 1987 – 1988
KeywordsMagmatic eruption / Bubbling / Connectivity of melt network / Magma effusion rate Critical melt fraction / Magma fragmentation / 不安定化機構
Research Abstract

The purpose of this project is to clarify some important clues in the elementary processes and dynamics of magmatic eruption. Among them, we focused two instability mechanisms likely to occur in the partial melting zone in the upper mantle and in the magma chamber --conduit during magma ascent in the near surface condition. The former includes (1) the separa-tion of meltphase from solid material, which is controlled by the critical melt fraction and connectivity of the melt network, (2) the Rayleigh-Taylor type instability occuring in a partial melting zone under island arcs which may be reflected the non-uniform spatial distribution of polygenetic volcanoes, and (3) non-linear coupling in rising magma dynamics which may result in the fractal structure of eruption interval from hot spot activity to the eruptive activity of active volcanoes. The latter includes some physico-chemical rate processes and fragmentation-bubbling kinetics in the magma chamber and the conduit. It is suggested that the volatile elements content, degree of super saturation, and the size distri-bution of magmatic fragments are important factors in the eruption column dynamics.

  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] Fujii,N.: Jour.Volcanol.Geotherm.Res.(1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Nakano,T.: Jour.Geophys.Res.94. (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tanaka,A.: Mem.Grad.School Sci.Tech.Kobe Univ.7-A. 59-68 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Ito,K.: Geophys.J.R.a.S.(1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Ui,T.: Proc.In Volcanology. 1. 201-209 (1988)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Maekawa,H.: Earth Planet.Sci.Lett.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Nakano,T.: "Melt network and critical fraction in a partially molten rock,Proceedings of Kagoshima International Conference on Volcanoes" National Institute for Research Advancement, 923 (1988)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Nakano,T.: "Melt network in a partially molten rock.in"Magma Transport and Storage"" John Wiley & Sons,Ltd., (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Fujii, N.: "On the fragmentation instability of eruptive magma by babbling" Jour. Volcanol. Geotherm. Res.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Nakano, T.: "The multiphase grain control percolation --Its implication for a partially molten rock--" Jour. Geophys. Res.94. (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tanaka, A.: "A dynamical model of the ridge-transform fault system" Mem. Grad. School Sci. Tech. Kobe Univ.7-A. 59-68 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Ito, K.: "Earthquakes as self-organized critical phenomena" Geophys. J. R. a. S.(1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Ui, T.: "Discrimination between debris avalanches and other volcaniclastic deposites" Proc. In Volcanology. 1. 201-209 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Nakano, T.: Melt network in a partially molten rock. in "Magma Transport and Storage", ed. by M. Ryan. John Wiley & Sons, Ltd., (1989)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1990-03-20  

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