Results 21 to 30 of about 9,703,189 (200)

Dynamics and Deposits of Pyroclastic Density Currents in Magmatic and Phreatomagmatic Eruptions Revealed by a Two‐Layer Depth‐Averaged Model

Geophysical Research Letters, 2023
A pyroclastic density current (PDC) is characterized by its strong stratification of particle concentration; it consists of upper dilute and lower dense currents, which generally control the dynamics and deposits of PDCs, respectively.
Hiroyuki A. Shimizu, Takehiro Koyaguchi, Yujiro J. Suzuki   +2 more
doaj   +1 more source

Experimental study of dense pyroclastic density currents using sustained, gas-fluidized granular flows [PDF]

, 2014
International audienceWe present the results of laboratory experiments on the behaviour of sustained, dense granular flows in a horizontal flume, in which high-gas pore pressure was maintained throughout the flow duration by continuous injection of gas ...
Druitt, Timothy H., Druitt, Tim, Cas, Ray, Cas, R., Rowley, Pete J., Rowley, Peter James, Roche, Olivier, Rowley, P. J., Druitt, T. H.   +8 more
core   +1 more source

Pyroclastic Density Current Hazard Assessment and Modeling Uncertainties for Fuego Volcano, Guatemala

Remote Sensing, 2020
On 3 June 2018, Fuego volcano experienced a VEI = 3 eruption, which produced a pyroclastic density current (PDC) that devastated the La Réunion resort and the community of Los Lotes, resulting in over 100 deaths.
Ian T. W. Flynn, Michael S. Ramsey
doaj   +1 more source

Pyroclastic density currents associated with the 2015 phreatomagmatic eruption of the Kuchinoerabujima volcano

Earth, Planets and Space, 2018
A pyroclastic density current (PDC) was observed with the phreatomagmatic eruption of the Kuchinoerabujima volcano, southern Japan, on May 29, 2015. The PDC flowed down in all direction from the source crater, forming three major branches.
Nobuo Geshi, Jun’ichi Itoh
doaj   +1 more source

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
openaire   +2 more sources

Reconstruction of the 29th December 2013 Eruption of San Miguel Volcano, El Salvador, using Video, Photographs and Pyroclastic Deposits

Volcanica, 2022
San Miguel (or Chaparrastique) volcano, El Salvador, erupted on the 29th December 2013, after almost 40 years of quiescence. Initial vent-clearing explosions ejected ballistic blocks and produced a pyroclastic density current (PDC) that flowed down the ...
Richard James Brown, Walter Hernández, Demetrio Escobar, Eduardo Gutierrez, Julia Crummy, Rosemary Cole, Pierre-Yves Tournigand   +6 more
doaj   +1 more source

Pyroclastic deposits and volcanic history of Mayor Island [PDF]

, 1981
The emergent summit of Mayor Island, Bay of Plenty, New Zealand, is a peralkaline rhyolite volcano constructed by: a sequence of lava flows, the Tutaretare Rhyolite Formation(new); and pyroclastic deposits, the Oira Pyroclastite Formation (new).
Nelson, Campbell S., Briggs, Roger M., Buck, M.D.   +2 more
core   +1 more source

A bedform phase diagram for dense granular currents

Nature Communications, 2020
In this study, Smith and colleagues employ analogue experiments to show the controlling parameters on sediment bedforms in pyroclastic density current deposits. The findings are applied and validated on natural deposits.
Gregory Smith, Peter Rowley, Rebecca Williams, Guido Giordano, Matteo Trolese, Aurora Silleni, Daniel R. Parsons, Samuel Capon   +7 more
doaj   +1 more source

A comprehensive paleomagnetic study from the last Plinian eruptions of Popocatepetl volcano: absolute chronology of lavas and estimation of emplacement temperatures of PDCs

Earth, Planets and Space, 2019
Three lava flows (Buenavista, Xalitzintla and Nealtican) and pyroclastic density currents (Lorenzo and Pink Pumice) from two Popocatepetl Plinian eruptions were sampled for paleomagnetic dating.
Nayeli Pérez-Rodríguez, Juan Morales, Avto Goguitchaichvili, Felipe García-Tenorio   +3 more
doaj   +1 more source

Probabilistic Volcanic Hazard Assessment for Pyroclastic Density Currents From Pumice Cone Eruptions at Aluto Volcano, Ethiopia

Frontiers in Earth Science, 2020
Aluto volcano, in the Main Ethiopian Rift, is a peralkaline caldera system, which comprises conglomerations of rhyolite (obsidian) lavas and enigmatic pumice cones.
Ben Clarke, Ben Clarke, Pablo Tierz, Pablo Tierz, Eliza Calder, Gezahegn Yirgu   +5 more
doaj   +1 more source