All Outputs (7)

Determination of permeability using a classic Darcy water column (2019)
Journal Article
Wadsworth, F. B., Vossen, C. E., Schmid, D., Colombier, M., Heap, M. J., Scheu, B., & Dingwell, D. B. (2020). Determination of permeability using a classic Darcy water column. American Journal of Physics, 88(1), 20-24. https://doi.org/10.1119/10.0000296

Permeability is a macroscopic property of materials with a percolating pore phase, such as many rocks and filters. We describe a simple experiment for the empirical determination of permeability using a low-cost method similar to that used by Darcy.... Read More about Determination of permeability using a classic Darcy water column.

The permeability of columnar jointed lava (2019)
Journal Article
Vasseur, J., & Wadsworth, F. B. (2019). The permeability of columnar jointed lava. Journal of Geophysical Research. Solid Earth, 124(11), 11305-11315. https://doi.org/10.1029/2019jb018118

Columnar jointed lava is an important facies in many geothermal reservoir systems. The permeability of jointed lavas is dominated by the contribution from fracture networks. We use a scaling for the permeability of a set of fractures in a solid or po... Read More about The permeability of columnar jointed lava.

A general model for welding of ash particles in volcanic systems validated using in situ X-ray tomography (2019)
Journal Article
Wadsworth, F. B., Vasseur, J., Schauroth, J., Llewellin, E. W., Dobson, K. J., Havard, T., …Heap, M. J. (2019). A general model for welding of ash particles in volcanic systems validated using in situ X-ray tomography. Earth and Planetary Science Letters, 525, Article 115726. https://doi.org/10.1016/j.epsl.2019.115726

Welding occurs during transport and deposition of volcanic particles in diverse settings, including pyroclastic density currents, volcanic conduits, and jet engines. Welding rate influences hazard-relevant processes, and is sensitive to water concent... Read More about A general model for welding of ash particles in volcanic systems validated using in situ X-ray tomography.

SO2 scrubbing during percolation through rhyolitic volcanic domes (2019)
Journal Article
Casas, A. S., Wadsworth, F. B., Ayris, P. M., Delmelle, P., Vasseur, J., Cimarelli, C., & Dingwell, D. B. (2019). SO2 scrubbing during percolation through rhyolitic volcanic domes. Geochimica et Cosmochimica Acta, 257, 150-162. https://doi.org/10.1016/j.gca.2019.04.013

Accurate estimates of the atmospheric impacts of large eruptions on the environment are complicated by a paucity of models for gas-magma or gas-rock interactions that can occur in the subsurface. It is in these environments that high-temperature scav... Read More about SO2 scrubbing during percolation through rhyolitic volcanic domes.

Experimental constraints on the textures and origin of obsidian pyroclasts (2019)
Journal Article
Gardner, J. E., Wadsworth, F. B., Llewellin, E. W., Watkins, J. M., & Coumans, J. P. (2019). Experimental constraints on the textures and origin of obsidian pyroclasts. Bulletin of Volcanology, 81, Article 22. https://doi.org/10.1007/s00445-019-1283-z

Obsidian pyroclasts are commonly preserved in the fall deposits of explosive silicic eruptions. Recent work has suggested that they form by sintering of ash particles on the conduit walls above the fragmentation depth and are subsequently torn out an... Read More about Experimental constraints on the textures and origin of obsidian pyroclasts.

Fracture healing and strength recovery in magmatic liquids (2019)
Journal Article
Lamur, A., Kendrick, J., Wadsworth, F., & Lavallée, Y. (2019). Fracture healing and strength recovery in magmatic liquids. Geology, 47(3), 195-198. https://doi.org/10.1130/g45512.1

Cycles of fracture and healing in magma are important controls on outgassing time scales and repetitive seismicity at silicic volcanoes. Here, we experimentally drove silicate melts (at 109–1011 Pa·s) to tensile failure, measuring the strength during... Read More about Fracture healing and strength recovery in magmatic liquids.

The permeability evolution of tuffisites and implications for outgassing through dense rhyolitic magma (2019)
Journal Article
Heap, M. J., Tuffen, H., Wadsworth, F. B., Reuschlé, T., Castro, J. M., & Schipper, C. I. (2019). The permeability evolution of tuffisites and implications for outgassing through dense rhyolitic magma. Journal of Geophysical Research: Earth Surface, 124(8), 8281-8299. https://doi.org/10.1029/2018jb017035

There is growing evidence that outgassing through transient fracture networks exerts an important control on conduit processes and explosive‐effusive activity during silicic eruptions. Indeed, the first modern observations of rhyolitic eruptions have... Read More about The permeability evolution of tuffisites and implications for outgassing through dense rhyolitic magma.