Results 31 to 40 of about 1,522 (205)

Spontaneous Unsteadiness and Sorting in Pyroclastic Density Currents and their Deposits - Data

, 2023
Dataset accompanying Spontaneous Unsteadiness and Sorting in Pyroclastic Density Currents and their Deposits, in Particulate Gravity Currents in the Environment. Raw experiment images and videos for selected runs.
Parsons, Daniel, WIlliams, Rebecca, Johnston, Thomas, Smith, Gregory, Walding, Nemi, Provost, Alison, Rowley, Pete, Johnson, Matthew, Dowey, Natasha, Roche, Olivier   +9 more
core   +1 more source

The Relative Effectiveness of Empirical and Physical Models for Simulating the Dense Undercurrent of Pyroclastic Flows under Different Emplacement Conditions

Frontiers in Earth Science, 2017
High concentration pyroclastic density currents (PDCs) are hot avalanches of volcanic rock and gas and are among the most destructive volcanic hazards due to their speed and mobility.
Sarah E. Ogburn, Eliza S. Calder
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

Pyroclastic density currents

, 2013
This chapter summarizes the principal experimental and theoretical approaches used to investigate the physics of pyroclastic density currents (PDCs), which are gravity driven hot gas–particle mixtures commonly generated during explosive volcanic eruptions.
Roche, Olivier, Phillips, J.C., Kelfoun, Karim   +2 more
openaire   +2 more sources

Identifying Pyroclastic Density Currents From Partial Outcrop Exposure on Mt. Ruapehu, New Zealand

Frontiers in Earth Science, 2020
Pyroclastic density current (PDC) deposits, especially small to medium volume events, have low preservation potential at many volcanoes, particularly when unconsolidated or deposited on steep, glaciated slopes.
Janina K. Gillies, Ben M. Kennedy, Darren M. Gravley, Graham S. Leonard, James Cowlyn   +4 more
doaj   +1 more source

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

, 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

Ash aggregate-rich pyroclastic density currents of the 431 CE Tierra Blanca Joven eruption, Ilopango caldera, El Salvador

, 2023
The VEI 6, Tierra Blanca Joven pyroclastic sequence (30–90 km3 DRE volume), erupted from Ilopango caldera, El Salvador, in 431 CE, is the product of one of the largest eruptions of the last two millennia.
Brown, Richard J., Tournigand, Pierre-Yves, Vallance, James W., James W. Vallance, Richard J. Brown, Van Eaton, Alexa R., Condren, Pearce, Alexa R. Van Eaton, Sweeney, Clare, Walter Hernández, Clare Sweeney, Pearce Condren, Pierre-Yves Tournigand, Hernández, Walter   +13 more
core   +1 more source

Scenario-Based Pyroclastic Density Current Invasion Maps at Poorly Known Volcanoes: A Case Study from Changbaishan (China/North Korea)

Applied Sciences, 2020
Changbaishan volcano (China/North Korea; last eruption in 1903 AD) was responsible for a Volcanic Explosivity Index (VEI) 7 eruption in 946 AD. Approximately 186,000 people live around Changbaishan and 2,000,000 tourists/year visit the volcano. An unrest
Anna Maria Lombardi, Pierdomenico Del Gaudio, Zhengfu Guo, Maoliang Zhang, Guoming Liu, Vincenzo Sepe, Jiaqi Liu, Guido Ventura   +7 more
doaj   +1 more source

Varying processes, similar results: How composition influences fragmentation and subsequent feeding of large pyroclastic density currents

Frontiers in Earth Science, 2022
Unlike their silicic counterparts, mafic eruptions are known for being on the low-end of the explosivity spectrum with eruption styles commonly ranging from effusive to Hawaiian fire fountaining.
Olivier Bernard, Olivier Bernard, Olivier Bernard, Caroline Bouvet de Maisonneuve, Caroline Bouvet de Maisonneuve, Laurent Arbaret, Laurent Arbaret, Kazuhide Nagashima, Jeffrey Oalmann, Arief Prabowo, Antonius Ratdomopurbo   +10 more
doaj   +1 more source

Small-Scale Lateral Variations in the Post-Plinian AD 79 Pyroclastic Density Currents Deposits

, 2021
Plinian eruptions form a sequence of pyroclastic fall deposits commonly overlain by ignimbrites. Partial column collapses often form intraplinian pyroclastic density currents (PDCs), and sustained column phases punctuate late, prevalent column collapse ...
Perrotta A., Santangelo I., Scarpati C., Fedele L., Chiominto G.   +4 more
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