Results 151 to 160 of about 29,420 (201)

Explosive fragmentation of erupting magma

Nature, 1995
The magma responsible for explosive volcanic eruptions has both a volatile and an inert phase. Deep in the conduit of an active volcano, bubbles nucleate as the volatiles exsolve. As the magma rises, the bubbles grow through depressurization and continued exsolution.
Sugioka, Ichiro, Bursik, Marcus
openaire   +2 more sources

Explosive Volcanic Eruptions

1984
Volcanic activity takes many forms, ranging from quiet lava emissions to extremely violent and explosive bursts, many of which can be related to magma composition as discussed in Chapter 3. The kinds of eruptions can be correlated to volcano shapes and sizes, and in this chapter we explore the connection between pyroclastic systems, eruptive mechanisms
Richard V. Fisher, Hans-Ulrich Schmincke
openaire   +1 more source

Airborne Acoustics of Explosive Volcanic Eruptions

Journal of Computational Acoustics, 2001
A recently developed theoretical model of the airborne acoustic field from an explosive volcanic eruption of the Strombolian type is described in this article. The magma column is assumed to be a circular cylinder, which is open to the atmosphere at the top, and which opens into a large magma chamber below.
MICHAEL J. BUCKINGHAM, MILTON A. GARCÉS
openaire   +2 more sources

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
openaire   +1 more source

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.
openaire   +1 more source

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
openaire   +1 more source

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
openaire   +1 more source

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.
openaire   +1 more source

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
openaire   +2 more sources

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 ...
openaire   +3 more sources