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1992 Spurr Eruption Case Discussion
27 Apr 2011 | Contributor(s):: William I Rose
This lecture summarizes distal ash cloud observations via satellite and radar, along with information about meteorology and fallout, for the 1992 Crater Peak/Spurr eruptions. These small subplinian events produced significant fine and very fine ash fallouts that were sampled and measured. Even...
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Detecting volcanic ash from space
08 Feb 2011 | Contributor(s):: William I Rose
How satellites detect, map and measure volcanic ash in volcanic clouds. HYSPLIT and volcanic cloud satellite observations. Volcanic cloud stages. Infrared satellite detectors, split window. Evolution of volcanic clouds from space platforms.Rose, W I, G J S Bluth, D J Schneider, G G J Ernst, C M...
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Ashfall blankets
08 Feb 2011 | Contributor(s):: William I Rose
Ashfall deposit geometry--blanket. Grain size/distance patterns. Total grain size distributions.Rose, W I, S Self, P J Murrow, G G J Ernst C Bonadonna and A J Durant, 2007, Pyroclastic fall deposit from the October 14, 1974 eruption of Fuego Volcano, Guatemala, Bull Volcanol,70 (9): 1043-1067,...
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Numerical fallout models: An introduction based on Suzuki (1983)
08 Feb 2011 | Contributor(s):: William I Rose
Suzuki, T., 1983. A theoretical model for dispersion of tephra, in: D. Shimozuru and I. Yokoyama (eds) Arc Volcanism: Physics and Tectonics, Terra Scientific Publishing, Tokyo, 95-116.
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Particle fall through the atmosphere
08 Feb 2011 | Contributor(s):: William I Rose
Particle fall in atmosphere. Particle Reynolds Numbers, turbulent and laminar flow. Shapes of volcanic ash particles. Fine particle fallout. Aggregation.Rose W I, C M Riley and S Dartevelle, 2003, Sizes and shapes of 10 ma distal ashfall pyroclasts in the Ogalalla Group, Nebraska, J Geology,...
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Phreatic and phreatomagmatic fragmentation
08 Feb 2011 | Contributor(s):: William I Rose
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Origin of volcanic ash: Mechanisms for formation
08 Feb 2011 | Contributor(s):: William I Rose
Mechanisms for the formation of volcanic ash are reviewed and discussed, including explosive vesiculation, phreatomagmatic explosions and milling/comminution.