Results 11 to 20 of about 1,522 (205)

Spontaneous Unsteadiness and Sorting in Pyroclastic Density Currents and their Deposits [PDF]

, 2023
Pyroclastic density currents (PDCs) pose substantial risk to populations living on and around active volcanoes, but their structure and internal dynamics are poorly understood. Much of this understanding is derived from interpretation of their widespread deposits.
Pete Rowley, Rebecca Williams, Matthew Johnson, Thomas Johnston, Natasha Dowey, Daniel Parsons, Alison Provost, Olivier Roche, Gregory Smith, Nemi Walding   +9 more
openaire   +2 more sources

Generation of Overspill Pyroclastic Density Currents

, 2021
Pyroclastic density currents (PDCs) are composed of hot gas and glass like ash or rocks. They can be very mobile, flowing over obstacles with ease but their pathway is often controlled by the topography they flow over. When a PDC is confined to valley it increases the distance it can travel but the PDC can overflow from the valley unexpectedly ...
Allison Kubo Hutchison, Josef Dufek
core   +4 more sources

Long-runout pyroclastic density currents: Analysis and implications

Geology, 2022
Abstract Pyroclastic density currents are hazardous, ground-hugging, hot mixtures of gas and solid particles produced by volcanoes. Currents generated by the largest explosive eruptions have traveled distances on the order of 100 km, and their devastating impact has repeatedly marked Earth's geologic history.
Roche, Olivier, Henry, Christopher, Azzaoui, Nourddine, Guillin, Arnaud   +3 more
openaire   +2 more sources

Turbulent particle-gas feedback exacerbates the hazard impacts of pyroclastic density currents

Communications Earth & Environment
Causing one-third of all volcanic fatalities, pyroclastic density currents create destruction far beyond our current scientific explanation. Opportunities to interrogate the mechanisms behind this hazard have long been desired, but pyroclastic density ...
Daniel H. Uhle, Gert Lube, Eric C. P. Breard, Eckart Meiburg, Josef Dufek, James Ardo, Jim R. Jones, Ermanno Brosch, Lucas R. P. Corna, Susanna F. Jenkins   +9 more
doaj   +2 more sources

Sedimentology and geomorphology of the deposits from the August 2006 pyroclastic density currents at Tungurahua volcano, Ecuador. [PDF]

Bull Volcanol, 2013
The deposits of the pyroclastic density currents from the August 2006 eruption of Tungurahua show three facies associations depending on the topographic setting: the massive, proximal cross-stratified, and distal cross-stratified facies.
Douillet GA, Tsang-Hin-Sun È, Kueppers U, Letort J, Pacheco DA, Goldstein F, Von Aulock F, Lavallée Y, Hanson JB, Bustillos J, Robin C, Ramón P, Hall M, Dingwell DB.   +13 more
europepmc   +2 more sources

Behaviours of pyroclastic and analogue materials, in dry and wet environments, for use in experimental modelling of pyroclastic density currents

Volcanica
Modelling pyroclastic density currents (PDCs) is a challenging yet essential element of hazard assessment. PDCs are unpredictable and internal processes are often difficult to measure directly.
Nemi Walding, Rebecca Williams, Pete Rowley, Natasha Dowey, Daniel Parsons, Anna Bird   +5 more
doaj   +3 more sources

Exploring pyroclastic density currents with analogue models

Nature Reviews Earth & Environment, 2022
Nemi Walding
exaly   +3 more sources

Thematic vent opening probability maps and hazard assessment of small-scale pyroclastic density currents in the San Salvador volcanic complex (El Salvador) and Nejapa-Chiltepe volcanic complex (Nicaragua) [PDF]

Natural Hazards and Earth System Sciences, 2021
The San Salvador volcanic complex (El Salvador) and Nejapa-Chiltepe volcanic complex (Nicaragua) have been characterized by a significant variability in eruption style and vent location.
A. Bevilacqua, A. Aravena, A. Aravena, A. Neri, E. Gutiérrez, D. Escobar, M. Schliz, A. Aiuppa, R. Cioni   +8 more
doaj   +1 more source

The ad 79 Vesuvius eruption revisited: the pyroclastic density currents

Journal of the Geological Society
Seventeen pyroclastic density currents (PDCs) were produced before, during and after the Plinian phase of the ad 79 eruption of Vesuvius. Their deposits were correlated using the proportions of components, together with the recognition of distinctive intercalated regionally traceable fall marker layers, revealing ...
Scarpati, C., Santangelo, I., Chiominto, G., Perrotta, A., Branney, M. J., Fedele, L.   +5 more
openaire   +3 more sources

New developments in the analysis of column-collapse pyroclastic density currents through numerical simulations of multiphase flows [PDF]

Solid Earth, 2012
A granular multiphase model has been used to evaluate the action of differently sized particles on the dynamics of fountains and associated pyroclastic density currents.
S. Lepore, C. Scarpati
doaj   +1 more source