S. R. Allen and J. Mcphie, Phenocryst fragments in rhyolitic lavas and lava domes, Journal of Volcanology and Geothermal Research, vol.126, issue.3-4, pp.263-283, 2003.
DOI : 10.1016/S0377-0273(03)00151-3

L. Arbaret, H. Diot, and J. L. Bouchez, Shape fabrics of particles in low concentration suspensions: 2D analogue experiments and application to tiling in magma, Journal of Structural Geology, vol.18, issue.7, pp.941-950, 1996.
DOI : 10.1016/0191-8141(96)00011-9

L. Arbaret, M. Bystricky, and R. Champallier, Microstructures and rheology of hydrous synthetic magmatic suspensions deformed in torsion at high pressure, Journal of Geophysical Research, vol.45, issue.B5, p.10208, 2007.
DOI : 10.1029/2006JB004856

URL : https://hal.archives-ouvertes.fr/insu-00170264

M. G. Best and E. H. Christiansen, Origin of broken phenocrysts in ash-flow tuffs, Geological Society of America Bulletin, vol.109, issue.1, pp.63-73, 1997.
DOI : 10.1130/0016-7606(1997)109<0063:OOBPIA>2.3.CO;2

A. Billi, Grain size distribution and thickness of breccia and gouge zones from thin (<1m) strike-slip fault cores in limestone, Journal of Structural Geology, vol.27, issue.10, pp.1823-1837, 2005.
DOI : 10.1016/j.jsg.2005.05.013

I. N. Bindeman, Fragmentation phenomena in populations of magmatic crystals, American Mineralogist, vol.90, issue.11-12, pp.1801-1815, 2005.
DOI : 10.2138/am.2005.1645

T. G. Blenkinsop, Cataclasis and processes of particle size reduction, Pure and Applied Geophysics PAGEOPH, vol.15, issue.1, pp.60-86, 1991.
DOI : 10.1007/BF00878888

L. Caricchi, L. Burlini, P. Ulmer, T. Gerya, M. Vassalli et al., Non-Newtonian rheology of crystal-bearing magmas and implications for magma ascent dynamics, Earth and Planetary Science Letters, vol.264, issue.3-4, pp.402-419, 2007.
DOI : 10.1016/j.epsl.2007.09.032

K. V. Cashman, C. R. Thornber, and J. S. Pallister, From dome to dust: shallow crystallization and fragmentation of conduit magma during the 2004-2006 dome extrusion of Mount St Helens (eds) A volcano rekindled: the renewed eruption of Mount St Helens, pp.387-413, 2004.

R. Champallier, M. Bystricky, and L. Arbaret, Experimental investigation of magma rheology at 300 MPa : From pure hydrous melt to 75, 2008.
URL : https://hal.archives-ouvertes.fr/insu-00170256

B. Cordonnier, K. Hess, Y. Lavallee, and D. B. Dingwell, Rheological properties of dome lavas: Case study of Unzen volcano, Earth and Planetary Science Letters, pp.263-272, 2009.

A. Costa, Viscosity of high crystal content melts: Dependence on solid fraction, Geophysical Research Letters, vol.70, issue.22, pp.10-1029, 2005.
DOI : 10.1029/2005GL024303

A. Costa, L. Caricchi, and N. Bagdassarov, A model for the rheology of particle-bearing suspensions and partially molten rocks, Geochemistry, Geophysics, Geosystems, vol.34, issue.6, pp.10-1029, 2009.
DOI : 10.1029/2008GC002138

D. B. Dingwell, The glass transition in hydrous granitic melts, Physics of the Earth and Planetary Interiors, vol.107, issue.1-3, pp.1-8, 1998.
DOI : 10.1016/S0031-9201(97)00119-2

D. B. Dingwell, C. Romano, and K. Hess, The effect of water on the viscosity of a haplogranitic melt under P-T-X conditions relevant to silicic volcanism, Contributions to Mineralogy and Petrology, vol.124, issue.1, pp.19-28, 1996.
DOI : 10.1007/s004100050170

A. C. Fischer-cripps, Introduction to contact mechanics, Mechanical Engineering Series, pp.10-1007, 2007.
DOI : 10.1007/978-0-387-68188-7

A. Freundt and H. Schmincke, Abrasion in pyroclastic flows, Geologische Rundschau, vol.11, issue.2, pp.383-389, 1992.
DOI : 10.1007/BF01828605

H. J. Frost and M. F. Ashby, Deformation ? mechanism Maps: The Plasticity and Creep of Metals and Ceramics, 1982.

G. A. Gualda and M. Rivers, Quantitative 3D petrography using x-ray tomography: Application to Bishop Tuff pumice clasts, Journal of Volcanology and Geothermal Research, vol.154, issue.1-2, pp.48-62, 2006.
DOI : 10.1016/j.jvolgeores.2005.09.019

R. Heilbronner and N. Keulen, Grain size and grain shape analysis of fault rocks, Tectonophysics, vol.427, issue.1-4, pp.199-216, 2006.
DOI : 10.1016/j.tecto.2006.05.020

K. Hess and D. B. Dingwell, Viscosities of hydrous leucogranitic melts: A non- Arrhenian model, Am. Mineral, vol.81, pp.1297-1300, 1996.

M. D. Higgins, Measurement of crystal size distributions, American Mineralogist, vol.85, issue.9, pp.1105-1116, 2000.
DOI : 10.2138/am-2000-8-901

M. D. Higgins, Closure in crystal size distributions (CSD), verification of CSD calculations, and the significance of CSD fans, American Mineralogist, vol.87, issue.1, pp.171-175, 2002.
DOI : 10.2138/am-2002-0118

M. D. Higgins, Verification of ideal semi-logarithmic, lognormal or fractal crystal size distributions from 2D datasets, Journal of Volcanology and Geothermal Research, vol.154, issue.1-2, pp.8-16, 2006.
DOI : 10.1016/j.jvolgeores.2005.09.015

F. Holtz, M. Pichavant, P. Barbey, and W. Johannes, Effects of H 2 O on liquidus phase relations in the haplogranite system at 2 and 5 kbar, Am. Mineral, vol.77, pp.1223-1241, 1992.

C. J. Horwell, . P. Braña, R. S. Sparks, M. D. Murphy, and V. L. Hards, A geochemical investigation of fragmentation and physical fractionation in pyroclastic flows from the Soufri??re Hills volcano, Montserrat, Journal of Volcanology and Geothermal Research, vol.109, issue.4, pp.247-262, 2001.
DOI : 10.1016/S0377-0273(00)00319-X

B. Kennedy, O. Spieler, B. Scheu, U. Kueppers, J. Taddeucci et al., Conduit implosion during Vulcanian eruptions, Geology, vol.33, issue.7, pp.581-584, 2005.
DOI : 10.1130/G21488.1

R. A. Ketcham, Three-dimensional grain fabric measurements using high-resolution X-ray computed tomography, Journal of Structural Geology, vol.27, issue.7, pp.1217-1228, 2005.
DOI : 10.1016/j.jsg.2005.02.006

R. A. Ketcham and W. D. Carlson, Acquisition, optimization and interpretation of X-ray computed tomographic imagery: applications to the geosciences, Computers & Geosciences, vol.27, issue.4, pp.381-400, 2001.
DOI : 10.1016/S0098-3004(00)00116-3

N. Keulen, R. Heilbronner, H. Stünitz, A. Boullier, and H. Ito, Grain size distributions of fault rocks: A comparison between experimentally and naturally deformed granitoids, Journal of Structural Geology, vol.29, issue.8, 2007.
DOI : 10.1016/j.jsg.2007.04.003

URL : https://hal.archives-ouvertes.fr/hal-00194259

A. N. Kolmogorov, On the lognormal distribution law of the dimensions of particles under pulverization. Doklady of the Academy of Sciences of the USSR 31, pp.99-101, 1941.

S. Kotov and P. Berendsen, Statistical characteristics of xenoliths in the Antioch kimberlite pipe, Marshall county, northeastern Kansas, Natural Resources Research, vol.11, issue.4, pp.289-297, 2002.
DOI : 10.1023/A:1021150012480

M. Laumonier, L. Arbaret, A. Burgisser, and R. Champallier, accepted. Porosity redistribution enhanced by strain localisation in crystal-rich magmas, Geology

P. Launeau, J. L. Bouchez, and K. Benn, Shape preferred orientation of object populations: automatic analysis of digitized images, Tectonophysics, vol.180, issue.2-4, pp.201-211, 1990.
DOI : 10.1016/0040-1951(90)90308-U

Y. Lavallée, K. Hess, B. Cordonnier, and D. B. Dingwell, Non-Newtonian rheological law for highly crystalline dome lavas, Geology, vol.35, issue.9, pp.843-846, 2008.
DOI : 10.1130/G23594A.1

Y. Lavallée, P. G. Meredith, D. B. Dingwell, K. Hess, J. Wassermann et al., Seismogenic lavas and explosive eruption forecasting, Seismogenic lavas and explosive eruption forecasting, pp.507-510, 2008.
DOI : 10.1038/nature06980

P. W. Lipman, Subsidence of ash-flow calderas: relation to caldera size and magma-chamber geometry, Bulletin of Volcanology, vol.59, issue.3, pp.198-218, 1997.
DOI : 10.1007/s004450050186

B. D. Marsh, On the Interpretation of Crystal Size Distributions in Magmatic Systems, Journal of Petrology, vol.39, issue.4, pp.553-599, 1988.
DOI : 10.1093/petroj/39.4.553

C. Martel, C. B. Dingwell, O. Spieler, M. Pichavant, and M. Wilke, Experimental fragmentation of crystal-and vesicle-bearing silicic melts, Bull. Volcanol, vol.63, pp.398-405, 2001.
URL : https://hal.archives-ouvertes.fr/hal-00089803

D. Miura, Arcuate pyroclastic conduits, ring faults, and coherent floor at Kumano caldera, southwest Honshu, Japan, Journal of Volcanology and Geothermal Research, vol.92, issue.3-4, pp.271-294, 1999.
DOI : 10.1016/S0377-0273(99)00089-X

M. S. Paterson and D. L. Olgaard, Rock deformation tests to large shear strains in torsion, Journal of Structural Geology, vol.22, issue.9, pp.1341-1358, 2000.
DOI : 10.1016/S0191-8141(00)00042-0

N. Petford and M. A. Koenders, Consolidation phenomena in sheared granitic magma: effects of grain size and tortuosity, Physics and Chemistry of the Earth, Part A: Solid Earth and Geodesy, vol.26, issue.4-5, pp.281-286, 2001.
DOI : 10.1016/S1464-1895(01)00057-6

M. Polacci, P. Papale, and M. Rosi, Textural heterogeneities in pumices from the climactic eruption of Mount Pinatubo, 15 June 1991, and implications for magma ascent dynamics, Bulletin of Volcanology, vol.95, issue.2-3, pp.83-97, 2001.
DOI : 10.1007/s004450000123

M. Polacci, M. Rosi, P. Landi, D. Muro, A. Papale et al., Novel interpretation for shift between eruptive styles in some volcanoes, Eos, Transactions American Geophysical Union, vol.392, issue.37, p.333, 2005.
DOI : 10.1029/2005EO370001

J. G. Ramsay, Folding and Fracturing of rocks, 1967.

M. O. Saar, M. Manga, K. V. Cashman, and S. Fresmouw, Numerical models of the onset of yield strength in crystal???melt suspensions, Earth and Planetary Science Letters, vol.187, issue.3-4, pp.367-379, 2001.
DOI : 10.1016/S0012-821X(01)00289-8

H. Sato, T. Fujii, and S. Nakada, Crumbling of dacite dome lava and generation of pyroclastic flows at Unzen volcano, Nature, vol.360, issue.6405, pp.664-666, 1992.
DOI : 10.1038/360664a0

F. Schulze, H. Behrens, F. Holtz, J. Roux, and W. Johannes, O on the viscosity of a haplogranitic melt, American Mineralogist, vol.81, issue.9-10, pp.1155-1165, 1996.
DOI : 10.2138/am-1996-9-1014

J. H. Simmons, R. K. Moher, and C. J. Montrose, Non???Newtonian viscous flow in glass, Journal of Applied Physics, vol.53, issue.6, 1982.
DOI : 10.1063/1.331272

J. V. Smith, Ductile-brittle transition structures in the basal shear zone of a rhyolite lava flow, eastern Australia, Journal of Volcanology and Geothermal Research, vol.72, issue.3-4, pp.217-223, 1996.
DOI : 10.1016/0377-0273(96)00009-1

J. V. Smith, Structural analysis of flow-related textures in lavas, Earth-Science Reviews, vol.57, issue.3-4, pp.279-297, 2002.
DOI : 10.1016/S0012-8252(01)00081-2

. Spieler-2004, O. Spieler, B. Kennedy, U. Kueppers, D. B. Dingwell et al., The fragmentation threshold of pyroclastic rocks, Earth and Planetary Science Letters, vol.226, issue.1-2, pp.139-148, 2004.
DOI : 10.1016/j.epsl.2004.07.016

M. Stampanoni, G. Borchert, P. Wyss, R. Abela, B. Patterson et al., High resolution X-ray detector for synchrotron-based microtomography. Nuclear Instruments and Methods in Physics Research, pp.291-301, 2002.

H. Tuffen and D. Dingwell, Fault textures in volcanic conduits: evidence for seismic trigger mechanisms during silicic eruptions, Bulletin of Volcanology, vol.25, issue.4, pp.370-387, 2005.
DOI : 10.1007/s00445-004-0383-5

H. Tuffen, R. Smith, and P. R. Sammonds, Evidence for seismogenic fracture of silicic magma, Nature, vol.54, issue.7194, pp.511-514, 2008.
DOI : 10.1038/nature06989

D. Turcotte, Fractal and Chaos in Geology and Geophysics, p.221, 1992.

S. L. Webb and D. B. Dingwell, The onset of non-Newtonian rheology of silicate melts. A fiber elongation study, Phys. Chem. Min, vol.17, pp.125-132, 1990.

D. G. Willis, A kinematic model of preferred orientation, Geological Society of America Bulletin, vol.88, issue.6, pp.883-894, 1977.
DOI : 10.1130/0016-7606(1977)88<883:AKMOPO>2.0.CO;2