Formation of Obsidian Pyroclasts by Sintering of Ash Particles in the Volcanic Conduit (2016)
Journal Article
Gardner, J., Llewellin, E., Watkins, J., & Befus, K. (2016). Formation of Obsidian Pyroclasts by Sintering of Ash Particles in the Volcanic Conduit. Earth and Planetary Science Letters, 459(1), 252-263. https://doi.org/10.1016/j.epsl.2016.11.037

The ranges in intensity and style of volcanic eruptions, from highly explosive Plinian eruptions to quiescent lava extrusions, depend on the style and efficiency of gas loss from ascending magma. Obsidian pyroclasts – small, glassy pieces of quenched... Read More about Formation of Obsidian Pyroclasts by Sintering of Ash Particles in the Volcanic Conduit.

Evolution of Vocabulary in the Poetry of Sylvia Plath (2016)
Journal Article
Wadsworth, F. B., Vasseur, J., & Damby, D. E. (2017). Evolution of Vocabulary in the Poetry of Sylvia Plath. Digital Scholarship in the Humanities, 32(3), 660-671. https://doi.org/10.1093/llc/fqw026

In this study, we provide a quantitative analysis of the temporal evolution of word choice across the career of Sylvia Plath, a poet who suffered from mental illness, which culminated in her suicide. Her work provides an excellent case study for temp... Read More about Evolution of Vocabulary in the Poetry of Sylvia Plath.

Blowing Off Steam: Tuffisite Formation As a Regulator for Lava Dome Eruptions (2016)
Journal Article
Kendrick, J. E., Lavallée, Y., Varley, N. R., Wadsworth, F. B., Lamb, O. D., & Vasseur, J. (2016). Blowing Off Steam: Tuffisite Formation As a Regulator for Lava Dome Eruptions. Frontiers in Earth Science, 4, Article 41. https://doi.org/10.3389/feart.2016.00041

Tuffisites are veins of variably sintered, pyroclastic particles that form in conduits and lava domes as a result of localized fragmentation events during gas-and-ash explosions. Those observed in-situ on the active 2012 lava dome of Volcán de Colima... Read More about Blowing Off Steam: Tuffisite Formation As a Regulator for Lava Dome Eruptions.

Sintering of viscous droplets under surface tension (2016)
Journal Article
Wadsworth, F. B., Vasseur, J., Llewellin, E., Schauroth, J., Dobson, K., Scheu, B., & Dingwell, D. (2016). Sintering of viscous droplets under surface tension. Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, 472(2188), Article 20150780. https://doi.org/10.1098/rspa.2015.0780

We conduct experiments to investigate the sintering of high-viscosity liquid droplets. Free-standing cylinders of spherical glass beads are heated above their glass transition temperature, causing them to densify under surface tension. We determine t... Read More about Sintering of viscous droplets under surface tension.

The architecture and shallow conduits of Laki-type pyroclastic cones: insights into a basaltic fissure eruption (2016)
Journal Article
Reynolds, P., Brown, R., Thordarson, T., & Llewellin, E. (2016). The architecture and shallow conduits of Laki-type pyroclastic cones: insights into a basaltic fissure eruption. Bulletin of Volcanology, 78(5), Article 36. https://doi.org/10.1007/s00445-016-1029-0

Pyroclastic cones built along basaltic fissures provide important volcanological information, but it is often difficult to examine the early-erupted products due to burial by later products. Furthermore, it is rare to see the link between the feeder... Read More about The architecture and shallow conduits of Laki-type pyroclastic cones: insights into a basaltic fissure eruption.

The strength of heterogeneous volcanic rocks: A 2D approximation (2016)
Journal Article
Heap, M. J., Wadsworth, F. B., Xu, T., Chen, C., & Tang, C. (2016). The strength of heterogeneous volcanic rocks: A 2D approximation. Journal of Volcanology and Geothermal Research, 319, 1-11. https://doi.org/10.1016/j.jvolgeores.2016.03.013

Volcanic rocks typically contain heterogeneities in the form of crystals and pores. We investigate here the influence of such heterogeneity on the strength of volcanic rocks using an elastic damage mechanics model in which we numerically deform two-d... Read More about The strength of heterogeneous volcanic rocks: A 2D approximation.

Closing an open system: Pore pressure changes in permeable edifice rock at high strain rates (2016)
Journal Article
Heap, M. J., & Wadsworth, F. B. (2016). Closing an open system: Pore pressure changes in permeable edifice rock at high strain rates. Journal of Volcanology and Geothermal Research, 315, 40-50. https://doi.org/10.1016/j.jvolgeores.2016.02.011

A permeable or open system will react as a closed system if the rocks implicated are deformed on a timescale that precludes fluid movement. Closed system (“undrained”) deformation therefore leads to a failure mode dependent change in pore pressure: m... Read More about Closing an open system: Pore pressure changes in permeable edifice rock at high strain rates.

Conduit margin heating and deformation during the AD 1886 basaltic Plinian eruption at Tarawera volcano, New Zealand (2016)
Journal Article
Schauroth, J., Wadsworth, F. B., Kennedy, B., von Aulock, F. W., Lavallée, Y., Damby, D. E., …Dingwell, D. B. (2016). Conduit margin heating and deformation during the AD 1886 basaltic Plinian eruption at Tarawera volcano, New Zealand. Bulletin of Volcanology, 78(2), Article 12. https://doi.org/10.1007/s00445-016-1006-7

During explosive eruptions, a suspension of gas and pyroclasts rises rapidly within a conduit. Here, we have analysed textures preserved in the walls of a pyroclastic feeder dyke of the AD 1886 Tarawera basaltic Plinian fissure eruption. The samples... Read More about Conduit margin heating and deformation during the AD 1886 basaltic Plinian eruption at Tarawera volcano, New Zealand.

Friendly fire: Engineering a fort wall in the Iron Age (2016)
Journal Article
Wadsworth, F. B., Heap, M. J., & Dingwell, D. B. (2016). Friendly fire: Engineering a fort wall in the Iron Age. Journal of Archaeological Science, 67, 7-13. https://doi.org/10.1016/j.jas.2016.01.011

There is widespread evidence that the walls of Iron Age forts across Europe were set on fire, causing partial melting of the stonework followed by either recrystallization or glass formation on cooling – a process termed “vitrification”. The motivati... Read More about Friendly fire: Engineering a fort wall in the Iron Age.

Universal scaling of fluid permeability during volcanic welding and sediment diagenesis (2016)
Journal Article
Wadsworth, F. B., Vasseur, J., Scheu, B., Kendrick, J. E., Lavallée, Y., & Dingwell, D. B. (2016). Universal scaling of fluid permeability during volcanic welding and sediment diagenesis. Geology, 44(3), 219-222. https://doi.org/10.1130/g37559.1

In sedimentary basins and volcanic edifices, granular materials undergo densification that results in a decrease of porosity and permeability. Understanding the link between porosity and permeability is central to predicting fluid migration in the se... Read More about Universal scaling of fluid permeability during volcanic welding and sediment diagenesis.

Dynamic elastic moduli during isotropic densification of initially granular media (2016)
Journal Article
Vasseur, J., Wadsworth, F. B., Lavallée, Y., & Dingwell, D. B. (2016). Dynamic elastic moduli during isotropic densification of initially granular media. Geophysical Journal International, 204(3), 1721-1728. https://doi.org/10.1093/gji/ggv550

The elastic properties of homogeneous, isotropic materials are well constrained. However, in heterogeneous and evolving materials, these essential properties are less well-explored. During sintering of volcanic ash particles by viscous processes as w... Read More about Dynamic elastic moduli during isotropic densification of initially granular media.