Results 261 to 270 of about 309,413 (302)

Fine ash content of explosive eruptions

Journal of Volcanology and Geothermal Research, 2009
Abstract In explosive eruptions, the mass proportion of ash that is aerodynamically fine enough to cause problems with jet aircraft or human lungs (  50%).
W.I. Rose, A.J. Durant
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Explosive Volcanic Eruptions

2001
During explosive volcanic eruptions, up to 1014 kg of volcanic ash may be erupted from a vent forming violent ash flows or towering eruption columns. This massive amount of material is subsequently deposited on the ground, with much of the coarser fraction of the flow being deposited within a few hundred kilometres of the volcanic edifice.
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Dynamics of deep-submarine explosive eruptions

2022
<div>Deposits from explosive submarine eruptions have been found in several deep-sea locations, with both flow and fall deposits of small clasts, 1-3mm, extending 1000’s m over the seafloor. Here we propose that after mixing with seawater, the erupting fragmented material typically forms a negatively buoyant fountain.
Eric Newland, Nicola Mingotti, Andrew Woods   +2 more
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Granular disruption during explosive volcanic eruptions

Nature Geoscience, 2012
Volcanic eruptions can inject hazardous ash clouds into the atmosphere. Numerical simulations and experiments on volcanic rock samples show that clasts initially formed deep in the volcanic conduit break-up during collisions in the conduit, thus generating fine-grained clouds of ash.
Josef Dufek, Michael Manga, Ameeta Patel
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Climatic impact of explosive volcanic eruptions

Nature, 1984
Major explosive volcanic eruptions inject ash and gas into the upper atmosphere, producing aerosol layers which can affect the global energy balance and climate1. Empirical studies have shown that major eruptions can produce a decrease in surface air temperature of up to a few tenths of a degree Celsius over the Northern Hemisphere land masses and that
Kelly, Mick, Sear, C.B.
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Strain-induced magma fragmentation in explosive eruptions

Nature, 1999
Explosive eruptions are the most powerful and destructive type of volcanic activity. These eruptions are characterized by magma fragmentation, the process through which a bubbly or foamy magma is transformed into a gas-pyroclast dispersion. Although magma fragmentation has been investigated both experimentally and theoretically, and the basic transport
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Tephra from the 1979 Soufriere Explosive Eruption

Science, 1982
The explosive phase of the 1979 Soufriere eruption produced 37.5 × 10 6 cubic meters (dense-rock equivalent) of tephra, consisting of about 40 percent juvenile basaltic andesite and 60 percent of a nonjuvenile component derived from the fragmentation of the 1971-1972 lava island during phreatomagmatic explosions ...
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Can climate crisis evoke explosive eruptions?

2022
<p>Phreatic events are the most unpredictable forms of volcanic activity. These explosive eruptions result from hydrofracturing of the host rock when the pressure of subsurface fluids exceeds the failure threshold. Fluid pressures may be sufficiently increased by an adjacent magmatic heat source, by topographically driven hydrostatic head,
Emma Katherine Kluge, Virginia Toy
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Explosive or effusive style of volcanic eruption determined by magma storage conditions

Nature Geoscience, 2021
R. Popa, O. Bachmann, C. Huber
semanticscholar   +1 more source

Explosive and Eruptive Variable Stars

2018
The breadth of activity among variable stars is almost overwhelming, and the possibilities of observing them seem almost endless. Many variables are followed by observers for their relatively slow pace of decline and recovery and enable one to gauge smooth light curves and collect data for a number of years.
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