Results 1 to 10 of about 5,519 (262)
Quantification of Eruption Dynamics on the North Rift at Axial Seamount, Juan de Fuca Ridge
Geochemistry, Geophysics, Geosystems, 2020 Quantifying eruption dynamics in submarine environments is challenging. During the 2015 eruption of Axial Seamount, the formation of hummocky mounds along the north rift was accompanied by tens of thousands of impulsive acoustic signals generated by the ...
M. Le Saout +3 more
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Superheating in mafic magmas controls clinopyroxene nucleation delay and magma ascent dynamics [PDF]
Nature CommunicationsCrystallisation kinetics play a fundamental role in controlling conduit dynamics and eruptive style. The degree of superheating is critical in controlling crystallisation kinetics; however, its effect is still debated and has an unclear impact on ...
Barbara Bonechi +14 more
doaj +2 more sources
Geochemistry, Geophysics, Geosystems, 2007 The explosive eruption of voluminous silicic magmas often produces widespread and massive deposits formed from pyroclastic density currents. While these punctuated events dramatically alter the landscape and have potential climate‐altering impact, our ...
Josef Dufek, George W. Bergantz
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Anticipating volcanic eruptions using rescaled range analysis of volcano-tectonic seismicity [PDF]
Scientific ReportsThe possibility of forecasting volcanic eruptions remains a major challenge for the volcanological scientific community. To date, various techniques based on volcano-tectonic seismicity, endogenous gas emission and satellite imagery have been widely ...
Raúl Pérez-López +7 more
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Eruption style and dynamics of the ~ 87 ka Baricha peralkaline rhyolite eruption in Ethiopia
Bulletin of VolcanologyAbstractPeralkaline rhyolites are a rare magma type, typically associated with continental rift settings, and characterised by excess alkalis relative to alumina and a moderate-low viscosity compared to calc-alkaline equivalents. Despite their prevalence in extensional rift settings, such as the Main Ethiopian Rift, eruption dynamics of peralkaline ...
Karen Fontijn +2 more
exaly +5 more sources
Effects of the crater on eruption column dynamics [PDF]
Journal of Geophysical Research, 2010 During explosive eruptions, a mixture of pyroclasts and volcanic gas forms a buoyant eruption column or a pyroclastic flow. We systematically investigate how the condition that separates these two eruption styles (column collapse condition) depends on crater shape and magma chamber conditions by integrating the theoretical models for conduit flow, flow
Yujiro Suzuki +2 more
exaly +2 more sources
Dynamics of deep-submarine volcanic eruptions
Scientific Reports, 2022 AbstractDeposits from explosive submarine eruptions have been found in the deep sea, 1–4 km below the surface, with both flow and fall deposits extending several km’s over the seafloor. A model of a turbulent fountain suggests that after rising 10–20 m above the vent, the erupting particle-laden mixture entrains and mixes with sufficient seawater that ...
Newland, Eric +2 more
openaire +4 more sources
The dynamics of an erupting prominence [PDF]
Astronomy & Astrophysics, 2002 H α full disk observations and radio interferometry at decimetre and metre wavelengths are used to probe the dynamics of ejecta and electron acceleration during a solar eruptive event on 1990 September 14. An erupting prominence and a moving type IV radio source are shown to trace a common magnetic structure during its rise from ~10 Mm to 3 $R_\odot ...
Klein, Karl-Ludwig, Mouradian, Zadig
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Characterising vent and crater shape changes at Stromboli: implications for risk areas
Volcanica, 2021 Active volcanoes are typically subject to frequent substantial topographic changes as well as variable eruption intensity, style and/or directionality. Gravitational instabilities and local accumulation of pyroclasts affect conditions at the active vents,
Markus Schmid +5 more
doaj +1 more source
On the dynamics of eruptive prominences [PDF]
Proceedings of the International Astronomical Union, 2013 AbstractTo contribute to the understanding of the physical mechanisms at work during the initial phase and early evolution of erupting prominences, we analyze combined observations from ground-based and space-borne instruments. We present two case studies, which occurred at two different phases of the solar cycle, namely on March 2, 2002 and on April ...
Laura A. Balmaceda +5 more
openaire +1 more source