Articles | Volume 13, issue 5
Research article
10 May 2022
Research article |  | 10 May 2022

Transient conduit permeability controlled by a shift between compactant shear and dilatant rupture at Unzen volcano (Japan)

Yan Lavallée, Takahiro Miwa, James D. Ashworth, Paul A. Wallace, Jackie E. Kendrick, Rebecca Coats, Anthony Lamur, Adrian Hornby, Kai-Uwe Hess, Takeshi Matsushima, Setsuya Nakada, Hiroshi Shimizu, Bernhard Ruthensteiner, and Hugh Tuffen

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Physical and mechanical rock properties of a heterogeneous volcano: the case of Mount Unzen, Japan
Jackie E. Kendrick, Lauren N. Schaefer, Jenny Schauroth, Andrew F. Bell, Oliver D. Lamb, Anthony Lamur, Takahiro Miwa, Rebecca Coats, Yan Lavallée, and Ben M. Kennedy
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Eruptive shearing of tube pumice: pure and simple
Donald B. Dingwell, Yan Lavallée, Kai-Uwe Hess, Asher Flaws, Joan Marti, Alexander R. L. Nichols, H. Albert Gilg, and Burkhard Schillinger
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Repetitive fracturing during spine extrusion at Unzen volcano, Japan
O. D. Lamb, S. De Angelis, K. Umakoshi, A. J. Hornby, J. E. Kendrick, and Y. Lavallée
Solid Earth, 6, 1277–1293,,, 2015
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Magma mixing enhanced by bubble segregation
S. Wiesmaier, D. Morgavi, C. J. Renggli, D. Perugini, C. P. De Campos, K.-U. Hess, W. Ertel-Ingrisch, Y. Lavallée, and D. B. Dingwell
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Seismogenic frictional melting in the magmatic column
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Related subject area

Subject area: The evolving Earth surface | Editorial team: Geochemistry, mineralogy, petrology, and volcanology | Discipline: Volcanology
Reproducing pyroclastic density current deposits of the 79 CE eruption of the Somma–Vesuvius volcano using the box-model approach
Alessandro Tadini, Andrea Bevilacqua, Augusto Neri, Raffaello Cioni, Giovanni Biagioli, Mattia de'Michieli Vitturi, and Tomaso Esposti Ongaro
Solid Earth, 12, 119–139,,, 2021
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Cited articles

Acocella, V.: Hazard mitigation of unstable volcanic edifices, EOS, 91, 357–358,, 2010. 
Alidibirov, M. and Dingwell, D. B.: Magma fragmentation by rapid decompression, Nature, 380, 146–148, 1996. 
Ashwell, P. A., Kendrick, J. E., Lavallée, Y., Kennedy, B. M., Hess, K. U., von Aulock, F. W., Wadsworth, F. B., Vasseur, J., and Dingwell, D. B.: Permeability of compacting porous lavas, J. Geophys. Res.-Sol. Ea., 120, 1605–1622,, 2015. 
Baker, D. R., Brun, F., O'Shaughnessy, C., Mancini, L., Fife, J. L., and Rivers, M.: A four-dimensional X-ray tomographic microscopy study of bubble growth in basaltic foam, Nat. Commun., 3, 1135,, 2012. 
Ball, J. L., Stauffer, P. H., Calder, E. S., and Valentine, G. A.: The hydrothermal alteration of cooling lava domes, B. Volcanol., 77, 102,, 2015. 
Short summary
Volcanic eruptions are controlled by the presence of gas bubbles in magma, which, in excess, can cause explosions. Eruption models lack an understanding of how gas percolates in magma flowing in a conduit. Here we study gas percolation in magma associated with the 1994–1995 eruption at Mt. Unzen, Japan. The results show that the pathways for gas escape depend on the depth and ascent rate of magma. Pathways closed at depth but opened along fractures when magma ascended rapidly near the surface.