Results 71 to 80 of about 9,703,189 (200)
Overview of Chaitén Volcano, Chile, and its 2008-2009 eruption
Andean Geology, 2013 Chaitén Volcano erupted unexpectedly in May 2008 in one of the largest eruptions globally since the 1990s. It was the largest rhyolite eruption since the great eruption of Katmai Volcano in 1912, and the first rhyolite eruption to have at least some of ...
Jon J. Major, Luis E. Lara
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New insights into the Upper Pleistocene directed blast eruption, Popocatépetl volcano, México
VolcanicaVolcanic eruptions of the directed blast type are characterized by powerful explosions with a significant lateral pyroclastic density current (PDC) component that can travel at speeds above 100 m s–1 and affect hundreds of square kilometers around a ...
R. Marcela Lira-Beltrán +4 more
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The Magnitude of the 39.8 ka Campanian Ignimbrite Eruption, Italy: Method, Uncertainties and Errors
Frontiers in Earth Science, 2020 The calculation of the magnitude of an eruption needs the accurate estimate of its deposit volume. This is particularly critical for ignimbrites as no methods for their volume calculations and associated errors and uncertainties are consolidated in the ...
Aurora Silleni +4 more
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Meandering flow of a pyroclastic density current documented by the Anisotropy of Magnetic
, 2008 A pattern of shifting current direction is revealed by the anisotropy of magnetic susceptibility (AMS) in the quartz latite ignimbrite associated with the Pleistocene Cimini dome complex in central Italy.
CAS R. A. F. +7 more
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Investigation of variable aeration of monodisperse mixtures: implications for pyroclastic density currents [PDF]
Bulletin of Volcanology, 2018 The high mobility of dense pyroclastic density currents (PDCs) is commonly attributed to high gas pore pressures. However, the influence of spatial and temporal variations in pore pressure within PDCs has yet to be investigated. Theory suggests that variability in the fluidisation and aeration of a current will have a significant control on PDC flow ...
Rowley, Pete +3 more
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CHAPTER 4.4 Pyroclastic Density Currents
Pyroclastic density currents (PDCs) are hot mixtures of gases and volcanic rock of diverse size, nature, or density, capable of flowing over long distances at velocities of tens to hundreds of kilometers per hour. They typically originate from the gravitational collapse of explosive eruption columns, lava domes or lava-flow fronts, unstable upper-flank
Sylvain Charbonnier +8 more
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Volcanic Ash Resuspension in Patagonia: Numerical Simulations and Observations
Atmosphere, 2020 Resuspension of pyroclastic deposits occurs under specific atmospheric and environmental conditions and typically prolongs and exacerbates the impact associated with the primary emplacement of tephra fallout and pyroclastic density current deposits.
Leonardo Mingari +3 more
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Andean Geology, 2013 Explosive activity at Chaitén Volcano in May 2008 and subsequent dome collapses over the following nine months triggered multiple, small-volume pyroclastic density currents (PDCs).
Jon J. Major +3 more
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Temperature proxy data and their significance for the understanding of pyroclastic density currents
, 2008 A major dome collapse of the Soufrière Hills volcano, Montserrat, on 26 December 1997 generated a devastating pyroclastic density current that destroyed vegetation and left a distinctive tar-like deposit on the surface.
Scott, Andrew C. +5 more
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, 2014 We describe a historical pyroclastic deposit attributed to a pyroclastic density current (PDC) in the NE, E and SE flanks from the Copahue volcano. The radiocarbon dating (F = 1.3678 ±0.0075) enable to correlate this pyroclastic deposit with two possible
D'Elia, L. +6 more
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