Results 181 to 190 of about 1,257 (218)
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Generation of air lubrication within pyroclastic density currents
Nature Geoscience, 2019Pyroclastic density currents are highly dangerous ground-hugging currents from volcanoes that cause >50% of volcanic fatalities globally. These hot mixtures of volcanic particles and gas exhibit remarkable fluidity, which allows them to transport thousands to millions of tonnes of volcanic material across the Earth’s surface over tens to hundreds of ...
Gert Lube +6 more
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Pyroclastic Density Currents at Volcán de Colima
2019In the last ~500 years, Volcan de Colima has generated numerous small-volume pyroclastic density currents (PDCs) that have been associated with dome emplacement, either by a partial collapse or by their explosive destruction. Large PDCs were generated by eruption column collapse in 1690, 1818, and 1913.
R. Saucedo +4 more
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Pyroclastic density current invasion maps
2016Campi Flegrei is an active caldera containing densely populated settlements at very high risk of pyroclastic density currents (PDCs). We present here an innovative method for assessing background spatial PDC hazard with probabilistic invasion maps conditional on the occurrence of an explosive event.
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Geology, 2011
AbstractThe Plinian columns formed during the magmatic phase of the A.D. 79 eruption of Vesuvius alternated several times between fully stable, buoyantly rising regimes and unstable regimes of partial or total collapse. Six pyroclastic density currents (PDCs) were produced during unstable regimes, and ultimately caused the destruction of Roman towns ...
Shea, Thomas +4 more
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AbstractThe Plinian columns formed during the magmatic phase of the A.D. 79 eruption of Vesuvius alternated several times between fully stable, buoyantly rising regimes and unstable regimes of partial or total collapse. Six pyroclastic density currents (PDCs) were produced during unstable regimes, and ultimately caused the destruction of Roman towns ...
Shea, Thomas +4 more
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Probabilistic hazard maps of dilute pyroclastic density current at Vesuvius
2023Dilute pyroclastic density currents are one major source of hazard at Vesuvius. By combining data of deposits of the explosive eruptions of the last six thousand years and interpolating data of impact parameters (Velocity, Density, particle volumetric concentration, temperature, dynamic pressure), which were calculated by modeling the currents as ...
Dellino, P. +3 more
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Flow and sedimentation of pyroclastic density currents
2015Our Earth is a living Planet in which rocks are exhumed at the surface, and subjected to erosion, transport and deposition. Pyroclastic density currents (PDCs) concentrate all these steps in a single phenomenon. During explosive volcanic eruptions, rock fragments known as pyroclasts are ejected from the inside of the Earth to the surface. They can then
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Aeromechanic analysis of pyroclastic density currents past a building
Bulletin of Volcanology, 2013An aeromechanic analysis of pyroclastic density currents (PDCs) past a building is carried out on the results of a computer simulation. The analysis shows that PDCs strongly interact with buildings, resulting in turbulent boundary layer separation and recirculation.
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Monitoring of Eruptive Products: Pyroclastic Density Currents and their Deposits
2022Pyroclastic density currents (PDCs) are a mixture of gases and solid particles that move across the Earth's topography under the influence of gravity. The term PDC has been proposed by several authors over the past 30 years in an effort to describe a natural continuum between two end-members: dilute currents, in which the fluid is prevalent, and ...
Tadini, Alessandro +4 more
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A laboratory study of plumes associated with pyroclastic density currents
Volcanic plumes associated with propagating pyroclastic density currents can rise tens of kilometers into the atmosphere, dispersing fine ash particles over large areas with a potential hazard for aviation safety. Such plumes originate from the buoyancy reversal of the pyroclastic density currents caused by the entrainment and heating of ambient air ...Guillaume Carazzo, Geoffrey Robert
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Dispersal and air entrainment in unconfined dilute pyroclastic density currents
Bulletin of Volcanology, 2014Unconfined scaled laboratory experiments show that 3D structures control the behavior of dilute pyroclastic density currents (PDCs) during and after liftoff. Experiments comprise heated and ambient temperature 20 μm talc powder turbulently suspended in air to form density currents within an unobstructed 8.5 × 6 × 2.6-m chamber.
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