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All Outputs (104)

Bubble Formation in Magma (2023)
Journal Article
Gardner, J. E., Wadsworth, F. B., Carley, T. L., Llewellin, E. W., Kusumaatmaja, H., & Sahagian, D. (2023). Bubble Formation in Magma. Annual Review of Earth and Planetary Sciences, 51(1), 131-154. https://doi.org/10.1146/annurev-earth-031621-080308

Volcanic eruptions are driven by bubbles that form when volatile species exsolve from magma. The conditions under which bubbles form depend mainly on magma composition, volatile concentration, presence of crystals, and magma decompression rate. These... Read More about Bubble Formation in Magma.

The exposed Mule Creek vent deposits record the structure of a volcanic conduit during a hybrid explosive–effusive eruption (2023)
Journal Article
Unwin, H. E., Tuffen, H., Wadsworth, F. B., Phillips, E. R., James, M. R., Foster, A., …Porritt, L. A. (2023). The exposed Mule Creek vent deposits record the structure of a volcanic conduit during a hybrid explosive–effusive eruption. Bulletin of Volcanology, 85(5), Article 28. https://doi.org/10.1007/s00445-023-01638-z

Silicic volcanic eruptions commonly begin with the explosive ejection of pyroclastic material, before transitioning to gentler effusion-dominated activity. Well-exposed dissected silicic systems are scarce and poorly studied, hindering the advances i... Read More about The exposed Mule Creek vent deposits record the structure of a volcanic conduit during a hybrid explosive–effusive eruption.

A universal model for the permeability of sintered materials (2023)
Journal Article
Wadsworth, F. B., Vasseur, J., Heap, M. J., Carbillet, L., Dingwell, D. B., Reuschlé, T., & Baud, P. (2023). A universal model for the permeability of sintered materials. Acta Materialia, 250, https://doi.org/10.1016/j.actamat.2023.118859

Sintered materials are used as permeable filters and flow controllers, for which a validated and general model of porosity and permeability is required. Here, we prepare samples built from mono- and polydisperse glass bead populations sintered for kn... Read More about A universal model for the permeability of sintered materials.

Dehydration‐driven mass loss from packs of sintering hydrous silicate glass particles (2023)
Journal Article
Vasseur, J., Wadsworth, F. B., Lavallée, Y., & Dingwell, D. B. (2023). Dehydration‐driven mass loss from packs of sintering hydrous silicate glass particles. Journal of the American Ceramic Society, 106(8), 4643-4653. https://doi.org/10.1111/jace.19120

Glass sintering involves the densification of packs of particles and the expulsion of the interparticle pore gas. The pore space begins as a convolute interconnected interparticle network, and ends as distributed isolated bubbles; two configurations... Read More about Dehydration‐driven mass loss from packs of sintering hydrous silicate glass particles.

The performance of differential point positioning using low-cost GNSS in comparison to DInSAR for monitoring coseismic displacement of the Provenzana–Pernicana fault system (Mt. Etna, 2018 December eruptive phase) (2023)
Journal Article
Wilkinson, M. W., Bonforte, A., Jones, R. R., Wadsworth, F. B., Roberts, G. P., & Guglielmino, F. (2023). The performance of differential point positioning using low-cost GNSS in comparison to DInSAR for monitoring coseismic displacement of the Provenzana–Pernicana fault system (Mt. Etna, 2018 December eruptive phase). Geophysical Journal International, 234(2), 1012-1023. https://doi.org/10.1093/gji/ggad118

Mt. Etna is a perfect laboratory for testing new approaches and new technologies in a very active geodynamic environment. It offers, in fact, the opportunity for measuring active crustal deformation, related to volcanic activity as well as to seismic... Read More about The performance of differential point positioning using low-cost GNSS in comparison to DInSAR for monitoring coseismic displacement of the Provenzana–Pernicana fault system (Mt. Etna, 2018 December eruptive phase).

Shear thinning and brittle failure in crystal-bearing magmas arise from local non-Newtonian effects in the melt (2023)
Journal Article
Vasseur, J., Wadsworth, F. B., & Dingwell, D. B. (2023). Shear thinning and brittle failure in crystal-bearing magmas arise from local non-Newtonian effects in the melt. Earth and Planetary Science Letters, 603, Article 117988. https://doi.org/10.1016/j.epsl.2023.117988

Crystal-bearing magmas are often assumed to be intrinsically non-Newtonian, but the mechanism underlying suspension shear thinning remains unconstrained. Here, we test the hypothesis that shear thinning in these suspensions arises solely from unrelax... Read More about Shear thinning and brittle failure in crystal-bearing magmas arise from local non-Newtonian effects in the melt.

A reappraisal of explosive–effusive silicic eruption dynamics: syn-eruptive assembly of lava from the products of cryptic fragmentation (2022)
Journal Article
Wadsworth, F. B., Llewellin, E. W., Castro, J. M., Tuffen, H., Schipper, C. I., Gardner, J. E., …Whattam, J. (2022). A reappraisal of explosive–effusive silicic eruption dynamics: syn-eruptive assembly of lava from the products of cryptic fragmentation. Journal of Volcanology and Geothermal Research, 432, https://doi.org/10.1016/j.jvolgeores.2022.107672

Silicic volcanic eruptions range in style from gently effusive to highly explosive, and may switch style unpredictably during a single eruption. Direct observations of subaerial rhyolitic eruptions (Chaiten 2008, Cordón Caulle 2011–2012, Chile) chall... Read More about A reappraisal of explosive–effusive silicic eruption dynamics: syn-eruptive assembly of lava from the products of cryptic fragmentation.

The Influence of Grain Size Distribution on Mechanical Compaction and Compaction Localization in Porous Rocks (2022)
Journal Article
Carbillet, L., Heap, M. J., Baud, P., Wadsworth, F. B., & Reuschlé, T. (2022). The Influence of Grain Size Distribution on Mechanical Compaction and Compaction Localization in Porous Rocks. Journal of Geophysical Research. Solid Earth, 127(11), https://doi.org/10.1029/2022jb025216

The modes of formation of clastic rocks result in a wide variety of microstructures, from poorly-sorted heterogeneous rocks to well-sorted and nominally homogeneous rocks. The mechanical behavior and failure mode of clastic rocks is known to vary wit... Read More about The Influence of Grain Size Distribution on Mechanical Compaction and Compaction Localization in Porous Rocks.

The Evolution of Paleo-Porosity in Basalts: Reversing Pore-Filling Mechanisms Using X-Ray Computed Tomography (2022)
Journal Article
Macente, A., Dobson, K., MacDonald, J., Wadsworth, F., & Vasseur, J. (2022). The Evolution of Paleo-Porosity in Basalts: Reversing Pore-Filling Mechanisms Using X-Ray Computed Tomography. Transport in Porous Media, 145(3), https://doi.org/10.1007/s11242-022-01869-2

Often carrying a high-volume fraction of vesicles, basaltic rocks can be an important reservoir horizon in petroleum systems, and are considered an excellent candidate for CO2 storage by in situ mineral trapping. The frequency of amygdaloidal basalts... Read More about The Evolution of Paleo-Porosity in Basalts: Reversing Pore-Filling Mechanisms Using X-Ray Computed Tomography.

In-conduit capture of sub-micron volcanic ash particles via turbophoresis and sintering (2022)
Journal Article
Farquharson, J. I., Tuffen, H., Wadsworth, F. B., Castro, J. M., Unwin, H., & Schipper, C. I. (2022). In-conduit capture of sub-micron volcanic ash particles via turbophoresis and sintering. Nature Communications, 13, Article 4713. https://doi.org/10.1038/s41467-022-32522-7

Ash emission in explosive silicic eruptions can have widespread impacts for human health, agriculture, infrastructure, and aviation. Estimates of the total grainsize distribution (TGSD) generated during explosive magma fragmentation underpins eruptio... Read More about In-conduit capture of sub-micron volcanic ash particles via turbophoresis and sintering.

Bubble rise in molten glasses and silicate melts during heating and cooling cycles (2022)
Journal Article
Jackson, L. E., Wadsworth, F. B., Mitchell, J., Rennie, C., Llewellin, E. W., Hess, K., & Dingwell, D. B. (2022). Bubble rise in molten glasses and silicate melts during heating and cooling cycles. Journal of the American Ceramic Society, 105(12), 7238-7253. https://doi.org/10.1111/jace.18680

The Hadamard–Rybczynski equation describes the steady-state buoyant rise velocity of an unconfined spherical bubble in a viscous liquid. This solution has been experimentally validated for the case where the liquid viscosity is held constant. Here, w... Read More about Bubble rise in molten glasses and silicate melts during heating and cooling cycles.

Variation of plagioclase shape with size in intermediate magmas: a window into incipient plagioclase crystallisation (2022)
Journal Article
Mangler, M. F., Humphreys, M. C., Wadsowrth, F. B., Iveson, A. A., & Higgins, M. D. (2022). Variation of plagioclase shape with size in intermediate magmas: a window into incipient plagioclase crystallisation. Contributions to Mineralogy and Petrology, 177(6), Article 64. https://doi.org/10.1007/s00410-022-01922-9

Volcanic rocks commonly display complex textures acquired both in the magma reservoir and during ascent to the surface. While variations in mineral compositions, sizes and number densities are routinely analysed to reconstruct pre-eruptive magmatic h... Read More about Variation of plagioclase shape with size in intermediate magmas: a window into incipient plagioclase crystallisation.

The Permeability of Porous Volcanic Rock Through the Brittle‐Ductile Transition (2022)
Journal Article
Heap, M. J., Meyer, G. G., Noël, C., Wadsworth, F. B., Baud, P., & Violay, M. E. (2022). The Permeability of Porous Volcanic Rock Through the Brittle‐Ductile Transition. Journal of Geophysical Research. Solid Earth, 127(6), https://doi.org/10.1029/2022jb024600

The permeability of volcanic rock controls the distribution of pore fluids and pore fluid pressure within a volcanic edifice, and is therefore considered to influence eruptive style and volcano deformation. We measured the porosity and permeability o... Read More about The Permeability of Porous Volcanic Rock Through the Brittle‐Ductile Transition.

Interparticle and Brownian forces controlling particle aggregation and rheology of silicate melts containing platinum-group element particles (2022)
Journal Article
Pereira, L., Vasseur, J., Wadsworth, F. B., Trixler, F., & Dingwell, D. B. (2022). Interparticle and Brownian forces controlling particle aggregation and rheology of silicate melts containing platinum-group element particles. Scientific Reports, 12(1), Article 9226. https://doi.org/10.1038/s41598-022-12948-1

We study the rheology of silicate melts containing platinum-group element (PGE) particles. They exhibit a shear-thinning behaviour, an intense aggregation tendency, and an anomalously high apparent viscosity in the low shear rate limit, even at very... Read More about Interparticle and Brownian forces controlling particle aggregation and rheology of silicate melts containing platinum-group element particles.

Crowd-sourcing observations of volcanic eruptions during the 2021 Fagradalsfjall and Cumbre Vieja events (2022)
Journal Article
Wadsworth, F. B., Llewellin, E. W., Farquharson, J. I., Gillies, J. K., Loisel, A., Frey, L., …Santabárbara, A. P. (2022). Crowd-sourcing observations of volcanic eruptions during the 2021 Fagradalsfjall and Cumbre Vieja events. Nature Communications, 13(1), https://doi.org/10.1038/s41467-022-30333-4

The Fagradalsfjall1 and Cumbre Vieja eruptions were spectacular and, in the case of Cumbre Vieja, highly destructive. Over their course, the eruptions waxed and waned, fed lava flows, caused numerous felt earthquakes and explosions, localized from cr... Read More about Crowd-sourcing observations of volcanic eruptions during the 2021 Fagradalsfjall and Cumbre Vieja events.

Universal scaling for the permeability of random packs of overlapping and nonoverlapping particles (2022)
Journal Article
Vasseur, J., Wadsworth, F. B., Bretagne, E., & Dingwell, D. B. (2022). Universal scaling for the permeability of random packs of overlapping and nonoverlapping particles. Physical Review E, 105(4), Article L043301. https://doi.org/10.1103/physreve.105.l043301

Constraining fluid permeability in porous media is central to a wide range of theoretical, industrial, and natural processes. In this Letter, we validate a scaling for fluid permeability in random and lattice packs of spheres and show that the permea... Read More about Universal scaling for the permeability of random packs of overlapping and nonoverlapping particles.

Vesiculation of Rhyolitic Melts Under Oscillatory Pressure (2022)
Journal Article
Seropian, G., Kennedy, B. M., Kendrick, J. E., Lavallée, Y., Nichols, A. R., von Aulock, F. W., …Wadsworth, F. B. (2022). Vesiculation of Rhyolitic Melts Under Oscillatory Pressure. Frontiers in Earth Science, 10, Article 812311. https://doi.org/10.3389/feart.2022.812311

Magma ascending in the Earth’s crust can undergo oscillations in pressure, from ultra-low frequency changes associated with tectonics, to relatively higher frequency oscillations associated with seismicity. Seismic waves travelling through shallow ma... Read More about Vesiculation of Rhyolitic Melts Under Oscillatory Pressure.

The force required to operate the plunger on a French press (2021)
Journal Article
Wadsworth, F. B., Vossen, C. E., Heap, M. J., Kushnir, A., Farquharson, J. I., Schmid, D., …Kendrick, J. E. (2021). The force required to operate the plunger on a French press. American Journal of Physics, 89, Article 769. https://doi.org/10.1119/10.0004224

The French press is a popular device for brewing coffee, comprising a cylindrical beaker—or “jug”—fitted with a lid and plunger with a fine wire mesh filter. The plunger is used to drive the solid coffee particles to the bottom of the jug, separating... Read More about The force required to operate the plunger on a French press.

Permeability of packs of polydisperse hard spheres (2021)
Journal Article
Vasseur, J., Wadsworth, F. B., Coumans, J. P., & Dingwell, D. B. (2021). Permeability of packs of polydisperse hard spheres. Physical Review E, 103(6), https://doi.org/10.1103/physreve.103.062613

The permeability of packs of spheres is important in a wide range of physical scenarios. Here, we create numerically generated random periodic domains of spheres that are polydisperse in size and use lattice-Boltzmann simulations of fluid flow to det... Read More about Permeability of packs of polydisperse hard spheres.