Kyushu University Academic Staff Educational and Research Activities Database
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Atsushi Toramaru Last modified date:2016.09.16

Professor / Dynamics, Structure and Evolution of the Earth and Planets
Department of Earth and Planetary Sciences
Faculty of Sciences

Graduate School
Undergraduate School
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Hope page of Group of Physics of magmatic processes, Petrology and Chemical geodynamics .
Academic Degree
Doctor of Science
Field of Specialization
Volcanology, Physics of Magmatic Processes, Igneous Petrology, Sciences on Form
Outline Activities
1-1.Study on the dynamics of igneous processes:Igneous processes are all processes concerning magmas sucha as the generation, segregation and migration processes of melts in the mantle, phenomena occuring in magma chambers, the magma intrusion into the crust, and the volcanic eruption. I study them from the view points of material science and physics; specially, the kinetics of crystallization and vesiculation (formation of bubbles in magmas) of magmas and the eruption mechanisms.
1-2.Study on the formation of igneous rock texture:Igneous rocks which are formed by the solidification of magmas, shows a wide variety of texture. "Texture" means the pattern characterized
by the geometrical interrelation among constituent minerals. I study the texture of igneous rocks from view points of the quantitative description of textures and the understandig of a fundamental process of crystallization during the magma solidification.
1-3.Study on the pattern formation: Interesting patters in natures are ubiquitous. Especially, I theoretically and experimentally study various patterns which are geologically interesting: the columnar joint formation by the solidification of magmas, the Liesegang ring phenomena as a kind of diffusion-reaction system, the layering formation by the flow of rocks or magmas.

I contribute the education through the colaborating researches as mentioned above with students. Three undergraduate and two graduate classes, seminars, the field survey, laboratory experiments, and discussion.

3.Social activities
On the homepage, I make a propaganda of results of researches and the enlightenment.
Research Interests
  • Study on the method of long-term prediction of large volcanic eruption by geology and material science
    keyword : volcanic eruption Long-term prediction
  • Study of columnar joint
    keyword : columar joint
  • An inverse method of CSD
    keyword : volcanic eruption, eruption style,microlite, crystallization kinetics
  • Study of factors controlling temporal change of eruption styles during volcanic eruption
    keyword : volcanic eruption, eruption style, vesiculation of magma, structure of magma chamber
  • Study on volcanic eruption using analog experiments
    keyword : experimental geyser, analog experiment, short term behavior, long term behavior, volcanic tremor, eruption style
  • Experimental and theoretical study of Liesegang ring
    keyword : Liesegang ring, pattern transition, periodic structure, branching structure, DLA
    1994.05~2026.05Experimental study of Liesegang ring. Using PbI2 precipitation system, I examine the precipitation patterns such as periodic pattern and branching structure, and the transtion between them, the influence of electric field on the pattern..
  • Earth science and physics on the structure formed by geological flows.
    keyword : deformation, flow, diffusion, streamline mixing, mantle convection, rhyolite, magma mixing
    1998.05~2026.05Physics and Petrological study on the layering structure formed by the deformation of magmas or rocks..
  • Kitchin experiments
    keyword : Kitchin earth science
    1996.05~2026.05Analogue experiments using material in kitchen..
  • Pattern formation and texture of igneous rocks
    keyword : magma, rock, pattern formation, crystallization, vesiculation, nonlinearity, nucleation, diffusion-reaction system
    1996.05~2026.05Texture of igneous rocks: the physics of ingeous textures and the crystallization of magmas..
  • Physics and earth science of magmatic processes
    keyword : magma, kinetics, crystallization,vesiculation,volcanic eruption, two-phase flow
    2000.04~2026.12Physics of magmatic processes: the study of the elemental prcoesses such as melting, crystallization, convection and vesiclutation included in magmatic processes from the generation of magmas at the mantle to the eruption on the surface ..
Academic Activities
1. Atsushi Toramaru, On the second nucleation of bubbles in magmas under sudden decompression, EARTH AND PLANETARY SCIENCE LETTERS, 404, 190-199, 2014.10.
2. Atsushi Toramaru, 前田一樹, Mass and style of eruptions in experimental geysers, Journal of Volcanology and Geothermal Reserches, 257 (2013) 227–239., 2013.04.
3. A. Toramaru and M. Matsumoto, Numerical experiment of cyclic layering in a solidified binary eutectic melt, Journal of Geophysical Research, VOL. 117, B02209, doi:10.1029/2011JB008204, 2012, 2012.02.
4. A. Toramaru, T. Miwa, Vesiculation and crystallization under instantaneous decompression: Numerical study and comparison with laboratory experiments, Journal of Volcanology and Geothermal Research, Volume 177, Issue 4, 20 November 2008, Pages 983-996
, 2008.11.
5. Toramaru, A., S. Noguchi, S. Oyoshihara, A. Tsune, MND(microlite number density) water exsolution rate meter, Journal of Volcanology and Geothermal Research, Volume 175, Issues 1-2, 30 July 2008, Pages 156-167
, 2008.07.
6. A. Toramaru, BND (bubble number density) decompression rate meter for explosive volcanic eruptions, Journal of Volcanology and Geothermal Research, 154 (2006) 303–316, 2006.05.
7. A. Toramaru and T. Matsumoto, Columnar joint morphology and cooling rate: a starch-water mixture experiment, Journal of Geophysical Research, 109, B02205, doi:10.1029/2003JB002686, 2004.02.
8. A. Toramaru, T. Harada and T. Okamura, Experimental pattern transitions in a Liesegang system, Physica D, 183, 133-140, 2003.09.
9. A. Toramarau, A numerical experiment of crystallization for a binary eutectic system with application to igneous textures, J. Geophys. Res., 106, 4037-4060, 2001.03.
10. A. Toramaru, E. Takazawa, T. Morishita, and K. Matsukage, Model of layering formation in a mantle peridotite (Horoman, Hokkaido, Japan), Earth Planet Sci. Lett., 185, 299-313, 2001.02.
1. 佐野恭平, 寅丸 敦志, 和田恵治, Textural analysis of obsidian lava flow in Shirataki, Northern Hokkaido, Japan, IAVCEI (International Association of Volcanology and Chemistry of the Earth's Interior)2013 Scientific Assembly, 2013.07.21.
2. 寅丸 敦志, Laboratory geyser; Insights into predictability of mass and style of eruptions, IAVCEI (International Association of Volcanology and Chemistry of the Earth's Interior)2013 Scientific Assembly, 2013.07.20.
3. Microlite systematics: Origin and implications for the
conduit flow.
4. The effect of electric field on the Liesegang pattern.
5. , [URL].