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Pyroclastic Flow Hazard at Volcán Citlaltépetl
Natural Hazards, 2004Volcan Citlaltepetl (Pico de Orizaba) with an elevation of 5,675 m is the highest volcano in North America. Its most recent catastrophic events involved the production of pyroclastic flows that erupted approximately 4,000, 8,500, and 13,000 years ago. The distribution of mapped deposits from these eruptions gives an approximate guide to the extent of ...
Michael F. Sheridan +3 more
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CLASSIFICATION OF PYROCLASTIC FLOWS
International Geology Review, 1961Pyroclastic flow is defined as the flow of high-temperature, essential, fragmental materials. This is synonymous with the nuee ardente in the broad sense. Three modes of emplacement of high-temperature, essential, solid (or liquid) materials after the ejection from the crater may be recognized: 1) Projection of fragments from the crater by explosive ...
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Andesitic pyroclastic flows from Colima Volcano
Nature, 1977COLIMA (19°31′N, 103°37′W) is important as one of the most continuously active continental andesite volcanoes in North America. Various types of pyroclastic and lava eruptions have been reported over the last 400 yr (ref. 1). Here we describe the eruption of andesitic lava and associated pyroclastic flows during December 1975–April 1976.
R. S. THORPE +2 more
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Stratified flow in pyroclastic surges
Bulletin of Volcanology, 1987Stratified flow theory is applied to pyroclatic surges in an effort to gain insight into transport dynamics during explosive eruptions. Particle transport is assumed to be by turbulent suspension, and calculations contained herein show that this is likely for many cases including the 18 May 1980 blast at mount St. Helens.
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Fluidization in Pyroclastic Flow
1998Engineering Foundation ...
MARZOCCHELLA, ANTONIO +3 more
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Violence in Pyroclastic Flow Eruptions
1981Three parameters, magnitude, intensity, and violence, can be used to characterise pyroclastic flow eruptions. Violence reflects the vigour with which a pyroclastic flow is emplaced. It is described quantitatively by the height of hills climbed by the flow (yielding flow-velocity estimates), the overall morphology of the deposit and by the proportion of
C. J. N. Wilson, G. P. L. Walker
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Bulletin Volcanologique, 1983
Schmincke andSwanson (1967) explained laminar flowage structures as indicators for flow direction of pyroclastic flows that show a radial flow pattern away from the source. Several other authors have reported similar examples, but the influence of pre-flow topographic relief has not been analyzed.
K. Suzuki, T. Ui
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Schmincke andSwanson (1967) explained laminar flowage structures as indicators for flow direction of pyroclastic flows that show a radial flow pattern away from the source. Several other authors have reported similar examples, but the influence of pre-flow topographic relief has not been analyzed.
K. Suzuki, T. Ui
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Acta Geologica Sinica - English Edition, 2013
AbstractIn this paper, we describe three strata at the distal part of the pyroclastic‐flow from the Tianchi volcano in 1215 (±15) eruption. One of the strata with crosslayers that are different from typical pyroclastic‐flow strata may come from a ground‐surge.
ZHAO Bo, XU Jiandong, LIN Chuanyong
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AbstractIn this paper, we describe three strata at the distal part of the pyroclastic‐flow from the Tianchi volcano in 1215 (±15) eruption. One of the strata with crosslayers that are different from typical pyroclastic‐flow strata may come from a ground‐surge.
ZHAO Bo, XU Jiandong, LIN Chuanyong
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High performance computing simulations of pyroclastic flows
Computer Physics Communications, 2005Explosive volcanic eruptions are certainly one of the most complex phenomena occurring in nature. In addition, the occurrence of pyroclastic flows, i.e. of high-velocity and high-temperature ground-hugging flows produced by the collapse of volcanic column, represent a very hazardous phenomenon for the nearby urbanized areas.
Carlo Cavazzoni +4 more
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Mechanism of deposition from pyroclastic flows
American Journal of Science, 1966Drag resistance developed between a pyroclastic flow and the ground results in a transitional zone of low velocity between the maximum velocity of the flow and the stationary ground. Fragments of all sizes within the turbulent flow travel irregular paths and therefore enter the reduced velocity zone at random and are deposited together irrespective of ...
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