All Outputs (30)

Investigation of variable aeration of monodisperse mixtures: implications for pyroclastic density currents (2018)
Journal Article
Smith, G. M., Williams, R., Rowley, P., & Parsons, D. R. (2018). Investigation of variable aeration of monodisperse mixtures: implications for pyroclastic density currents. Bulletin of volcanology, 80(8), Article 67. https://doi.org/10.1007/s00445-018-1241-1

The high mobility of dense pyroclastic density currents (PDCs) is commonly attributed to high gas pore pressures. However, the influence of spatial and temporal variations in pore pressure within PDCs has yet to be investigated. Theory suggests that... Read More about Investigation of variable aeration of monodisperse mixtures: implications for pyroclastic density currents.

Non-Hawaiian lithostratigraphy of Louisville seamounts and the formation of high-latitude oceanic islands and guyots (2018)
Journal Article
Buchs, D. M., Williams, R., Sano, S.-I., & Wright, V. P. (2018). Non-Hawaiian lithostratigraphy of Louisville seamounts and the formation of high-latitude oceanic islands and guyots. Journal of Volcanology and Geothermal Research, 356, 1-23. https://doi.org/10.1016/j.jvolgeores.2017.12.019

Guyots are large seamounts with a flat summit that is generally believed to form due to constructional biogenic and/or erosional processes during the formation of volcanic islands. However, despite their large abundance in the oceans, there are still... Read More about Non-Hawaiian lithostratigraphy of Louisville seamounts and the formation of high-latitude oceanic islands and guyots.

Explosive eruptive history of Pantelleria, Italy : repeated caldera collapse and ignimbrite emplacement at a peralkaline volcano (2017)
Journal Article
Jordan, N., Rotolo, S., Williams, R., Speranza, F., McIntosh, W., Branney, M. J., & Scaillet, S. (2018). Explosive eruptive history of Pantelleria, Italy : repeated caldera collapse and ignimbrite emplacement at a peralkaline volcano. Journal of Volcanology and Geothermal Research, 349, 47-73. https://doi.org/10.1016/j.jvolgeores.2017.09.013

A new, pre-Green Tuff (46 ka) volcanic stratigraphy is presented for the peralkaline Pantelleria Volcano, Italy. New ⁴⁰Ar/³⁹Ar and paleomagnetic data are combined with detailed field studies to develop a comprehensive stratigraphic reconstruction of... Read More about Explosive eruptive history of Pantelleria, Italy : repeated caldera collapse and ignimbrite emplacement at a peralkaline volcano.

Shifting landscapes: from coalface to quick sand? Teaching geography, earth and environmental sciences in UK higher education (2016)
Journal Article
Dyer, S., Walkington, H., Williams, R., Morton, K., & Wyse, S. (2016). Shifting landscapes: from coalface to quick sand? Teaching geography, earth and environmental sciences in UK higher education. Area, 48(3), 308-316. https://doi.org/10.1111/area.12261

In this paper we examine contemporary academic working lives, with particular reference to teaching-only and teaching-focused academics. We argue that intensification in the neoliberal university has significantly shifted the structure of academic ca... Read More about Shifting landscapes: from coalface to quick sand? Teaching geography, earth and environmental sciences in UK higher education.

Re-Os isotope and platinum group elements of a FOcal ZOne mantle source, Louisville Seamounts Chain, Pacific ocean (2015)
Journal Article
Tejada, M. L. G., Hanyu, T., Ishikawa, A., Senda, R., Suzuki, K., Fitton, G., & Williams, R. (2015). Re-Os isotope and platinum group elements of a FOcal ZOne mantle source, Louisville Seamounts Chain, Pacific ocean. Geochemistry, geophysics, geosystems G³, 16(2), 486-504. https://doi.org/10.1002/2014GC005629

The Louisville Seamount Chain (LSC) is, besides the Hawaiian-Emperor Chain, one of the longest-lived hotspot traces. We report here the first Re-Os isotope and platinum group element (PGE) data for Canopus, Rigil, and Burton Guyots along the chain, w... Read More about Re-Os isotope and platinum group elements of a FOcal ZOne mantle source, Louisville Seamounts Chain, Pacific ocean.

Temporal and spatial evolution of a waxing then waning catastrophic density current revealed by chemical mapping (2014)
Journal Article
Williams, R., Branney, M. J., & Barry, T. L. (2014). Temporal and spatial evolution of a waxing then waning catastrophic density current revealed by chemical mapping. Geology, 42(2), 107-110. https://doi.org/10.1130/G34830.1

We reconstruct the behavior of a catastrophic sustained radial pyroclastic density current as it waxed then waned during its brief lifespan. By subdividing the deposit into 8 time slices using a chemical tracer, we show that the sustained current ini... Read More about Temporal and spatial evolution of a waxing then waning catastrophic density current revealed by chemical mapping.

IODP Expedition 330 : drilling the Louisville Seamount Trail in the SW Pacific (2013)
Journal Article
Koppers, A. A., Yamazaki, T., Geldmacher, J., Anderson, L., Beier, C., Buchs, D. M., Chen, L. H., Cohen, B. E., Deschamps, F., Dorais, M. J., Ebuna, D., Ehmann, S., Fitton, J. G., Fulton, P. M., Ganbat, E., Gee, J. S., Hamelin, C., Hanyu, T., Hoshi, H., Kalnins, L., …Williams, R. (2013). IODP Expedition 330 : drilling the Louisville Seamount Trail in the SW Pacific. Scientific Drilling, 11-22. https://doi.org/10.5194/sd-15-11-2013

Deep-Earth convection can be understood by studying hotspot volcanoes that form where mantle plumes rise up and intersect the lithosphere, the Earth's rigid outer layer. Hotspots characteristically leave age-progressive trails of volcanoes and seamou... Read More about IODP Expedition 330 : drilling the Louisville Seamount Trail in the SW Pacific.

Erratum: Limited latitudinal mantle plume motion for the Louisville hotspot (Nature Geoscience (2012) 5 (911-917)) (2012)
Journal Article
Koppers, A. A., Yamazaki, T., Geldmacher, J., Gee, J. S., Pressling, N., Hoshi, H., Anderson, L., Beier, C., Buchs, D. M., Chen, L. H., Cohen, B. E., Deschamps, F., Dorais, M. J., Ebuna, D., Ehmann, S., Fitton, J. G., Fulton, P. M., Ganbat, E., Hamelin, C., Hanyu, T., …Williams, R. (2013). Erratum: Limited latitudinal mantle plume motion for the Louisville hotspot (Nature Geoscience (2012) 5 (911-917)). Nature Geoscience, 6(1), 76. https://doi.org/10.1038/ngeo1677

Limited latitudinal mantle plume motion for the Louisville hotspot (2012)
Journal Article
Koppers, A. A., Yamazaki, T., Geldmacher, J., Gee, J. S., Pressling, N., Hoshi, H., Anderson, L., Beier, C., Buchs, D. M., Chen, L. H., Cohen, B. E., Deschamps, F., Dorais, M. J., Ebuna, D., Ehmann, S., Fitton, J. G., Fulton, P. M., Ganbat, E., Hamelin, C., Hanyu, T., …Williams, R. (2012). Limited latitudinal mantle plume motion for the Louisville hotspot. Nature Geoscience, 5(12), 911-917. https://doi.org/10.1038/ngeo1638

Hotspots that form above upwelling plumes of hot material from the deep mantle typically leave narrow trails of volcanic seamounts as a tectonic plate moves over their location. These seamount trails are excellent recorders of Earth's deep processes... Read More about Limited latitudinal mantle plume motion for the Louisville hotspot.

Evaluation of the Titan2D two-phase flow model using an actual event: case study of the 2005 Vazcún Valley Lahar (2008)
Journal Article
Williams, R., Stinton, A. J., & Sheridan, M. F. (2008). Evaluation of the Titan2D two-phase flow model using an actual event: case study of the 2005 Vazcún Valley Lahar. Journal of Volcanology and Geothermal Research, 177(4), 760-766. https://doi.org/10.1016/j.jvolgeores.2008.01.045

Titan2D is a depth-averaged, thin-layer computational fluid dynamics (CFD) code, suitable for simulating a variety of geophysical mass flows. Titan2D output data include flow thickness and flow momentum at each time step for all cells traversed by th... Read More about Evaluation of the Titan2D two-phase flow model using an actual event: case study of the 2005 Vazcún Valley Lahar.