All Outputs (9)

The Birth of a Hawaiian Fissure Eruption (2020)
Journal Article
Houghton, B., Tisdale, C., Llewellin, E., Taddeucci, J., Orr, T., Walker, B., & Patrick, M. (2021). The Birth of a Hawaiian Fissure Eruption. Journal of Geophysical Research: Earth Surface, 126(1), Article e2020JB020903. https://doi.org/10.1029/2020jb020903

Most basaltic explosive eruptions intensify abruptly, allowing little time to document processes at the start of eruption. One opportunity came with the initiation of activity from fissure 8 (F8) during the 2018 eruption on the lower East Rift Zone o... Read More about The Birth of a Hawaiian Fissure Eruption.

Explosivity of basaltic lava fountains is controlled by magma rheology, ascent rate and outgassing (2020)
Journal Article
La Spina, G., Arzilli, F., Llewellin, E., Burton, M., Clarke, A., de' Michieli Vitturi, M., Polacci, M., Hartley, M., Di Genova, D., & Mader, H. (2021). Explosivity of basaltic lava fountains is controlled by magma rheology, ascent rate and outgassing. Earth and Planetary Science Letters, 553, Article 116658. https://doi.org/10.1016/j.epsl.2020.116658

The dichotomy between explosive volcanic eruptions, which produce pyroclasts, and effusive eruptions, which produce lava, is defined by the presence or absence of fragmentation during magma ascent. For lava fountains the distinction is unclear, since... Read More about Explosivity of basaltic lava fountains is controlled by magma rheology, ascent rate and outgassing.

A model for permeability evolution during volcanic welding (2020)
Journal Article
Wadsworth, F. B., Vasseur, J., Llewellin, E. W., Brown, R. J., Tuffen, H., Gardner, J. E., Kendrick, J. E., Lavallée, Y., Dobson, K. J., Heap, M. J., Dingwell, D. B., Hess, K.-U., Schauroth, J., von Aulock, F. W., Kushnir, A. R., & Marone, F. (2021). A model for permeability evolution during volcanic welding. Journal of Volcanology and Geothermal Research, 409, https://doi.org/10.1016/j.jvolgeores.2020.107118

Volcanic ash and pyroclasts can weld when deposited hot by pyroclastic density currents, in near-vent fall deposits, or in fractures in volcano interiors. Welding progressively decreases the permeability of the particle packs, influencing a range of... Read More about A model for permeability evolution during volcanic welding.

Convective tipping point initiates localization of basaltic fissure eruptions (2020)
Journal Article
Jones, T. J., & Llewellin, E. W. (2021). Convective tipping point initiates localization of basaltic fissure eruptions. Earth and Planetary Science Letters, 553, Article 116637. https://doi.org/10.1016/j.epsl.2020.116637

Basaltic fissure eruptions may evolve rapidly and unpredictably complicating hazard management. Localization of an elongate fissure to one or more focused vents may take days to months, and depends on fluid dynamic processes, such as thermally-driven... Read More about Convective tipping point initiates localization of basaltic fissure eruptions.

Explosive-effusive volcanic eruption transitions caused by sintering (2020)
Journal Article
Wadsworth, F. B., Llewellin, E. W., Vasseur, J., Gardner, J. E., & Tuffen, H. (2020). Explosive-effusive volcanic eruption transitions caused by sintering. Science Advances, 6(39), Article eaba7940. https://doi.org/10.1126/sciadv.aba7940

Silicic volcanic activity has long been framed as either violently explosive or gently effusive. However, recent observations demonstrate that explosive and effusive behavior can occur simultaneously. Here, we propose that rhyolitic magma feeding sub... Read More about Explosive-effusive volcanic eruption transitions caused by sintering.

Quantifying Microstructural Evolution in Moving Magma (2020)
Journal Article
Dobson, K. J., Allabar, A., Bretagne, E., Coumans, J., Cassidy, M., Cimarelli, C., Coats, R., Connolley, T., Courtois, L., Dingwell, D. B., Di Genova, D., Fernando, B., Fife, J. L., Fyfe, F., Gehne, S., Jones, T., Kendrick, J. E., Kinvig, H., Kolzenburg, S., Lavallée, Y., …Wanelik, K. (2020). Quantifying Microstructural Evolution in Moving Magma. Frontiers in Earth Science, 8, https://doi.org/10.3389/feart.2020.00287

Many of the grand challenges in volcanic and magmatic research are focused on understanding the dynamics of highly heterogeneous systems and the critical conditions that enable magmas to move or eruptions to initiate. From the formation and developme... Read More about Quantifying Microstructural Evolution in Moving Magma.

An experimentally validated numerical model for bubble growth in magma (2020)
Journal Article
Coumans, J., Llewellin, E., Wadsworth, F., Humphreys, M., Mathias, S., Yelverton, B., & Gardner, J. (2020). An experimentally validated numerical model for bubble growth in magma. Journal of Volcanology and Geothermal Research, 402, Article 107002. https://doi.org/10.1016/j.jvolgeores.2020.107002

Volcanic eruptions are driven by the growth of gas bubbles in magma. The timing and rate of bubble growth are important because they determine whether enough gas pressure can develop to fragment the melt. Bubbles grow in response to decompression and... Read More about An experimentally validated numerical model for bubble growth in magma.

A novel experimental apparatus for investigating bubbly flows in a slot geometry (2020)
Journal Article
Capponi, A., Crosby, A. C., Lishman, S., & Llewellin, E. W. (2020). A novel experimental apparatus for investigating bubbly flows in a slot geometry. Review of Scientific Instruments, 91(4), Article 045110. https://doi.org/10.1063/1.5126775

Bubbly flows occur in a wide variety of industrial and environmental settings. While there is a broad literature that describes bubbly flow behavior in pipes and channels, flow in a high aspect ratio slot has received little attention. We describe th... Read More about A novel experimental apparatus for investigating bubbly flows in a slot geometry.

The use of a shear thinning polymer as a bubbly magma analogue for scaled laboratory experiments (2020)
Journal Article
Jones, T. J., Llewellin, E. W., & Mader, H. M. (2020). The use of a shear thinning polymer as a bubbly magma analogue for scaled laboratory experiments. Journal of Volcanology and Geothermal Research, 392, Article 106768. https://doi.org/10.1016/j.jvolgeores.2020.106768

Analogue materials are commonly used in volcanology to perform scaled laboratory experiments. Analogue experiments inform on fundamental fluid dynamic, structural and mechanical processes that are typically very difficult to observe and quantify dire... Read More about The use of a shear thinning polymer as a bubbly magma analogue for scaled laboratory experiments.