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Plinian and co-ignimbrite tephra fall from the

Bulletin of Volcanology, 1989
A study of pyroclastic deposits from the 1815 Tambora eruption reveals two distinct phases of activity, i.e., four initial tephra falls followed by generation of pyroclastic flows and the production of major co-ignimbrite ash fall. The first explosive event produced minor ash fall from phreatomagmatic explosions (F-1 layer).
Sigurdsson, Haraldur, Carey, Steven
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Total grain-size distribution and volume of tephra-fall deposits

Bulletin of Volcanology, 2005
On 17 June 1996, Ruapehu volcano, New Zealand, produced a sustained andesitic sub-Plinian eruption, which generated a narrow tephra-fall deposit extending more than 200 km from the volcano. The extremely detailed data set from this eruption allowed methods for the determination of total grain-size distribution and volume of tephra-fall deposits to be ...
Bonadonna, Costanza, Houghton, B.F.
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Sedimentation of tephra by volcanic plumes. Part 2: controls on thickness and grain-size variations of tephra fall deposits

Bulletin of Volcanology, 1992
A model for sedimentation from turbulent suspensions predicts that tephra concentration decreases exponentially with time in an ascending volcanic column and in the overlying umbrella cloud. For grain-size distributions typical of plinian eruptions application of the model predicts for thickness variations in good agreement with the exponential ...
Sparks, RSJ   +4 more
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Geochemical and geotechnical characterization of compacted air-fall tephras

2023
Presentation by University of Canterbury PhD student Shaurya ...
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Probabilistic tephra fall simulation for the Auckland Region, New Zealand

Journal of Volcanology and Geothermal Research, 2006
Abstract The Auckland Region, New Zealand is at significant risk from tephra falls originating both from the local Auckland Volcanic Field (AVF) and several distant, large-volume centres. We use geological data and observations of historical eruptions to develop a catalogue of simulated tephra dispersal patterns for the Auckland Region, using the ...
C.R. Magill   +3 more
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A model for the numerical simulation of tephra fall deposits

Journal of Volcanology and Geothermal Research, 2005
Abstract A simple semianalytical model to simulate ash dispersion and deposition produced by sustained Plinian and sub-Plinian eruption columns based on the 2D advection–dispersion equation was applied. The eruption column acts as a vertical line source with a given mass distribution and neglects the complex dynamics within the eruption column. Thus,
T. Pfeiffer, A. Costa, G. Macedonio
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Forest fire following Holocene tephra fall

1981
The rhyolitic eruptions of the Taupo Pumice (c. 1800 B.P.) and the Kaharoa Ash (c. 700 B.P.) devastated forest close to the volcanic source. However, pollen diagrams from regions up to 150 km from the volcanic centre show that widespread fires were common over an appreciable period after both eruptions.
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Some Effects of Tephra Falls on Buildings

1981
A survey of the volcanological literature reveals that only limited generalisations concerning the effects of volcanic bomb impacts and tephra loads on buildings can be made. By using data from a variety of other sources, however, it is possible to define the impact energies required to penetrate or damage a variety of building materials.
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Agricultural vulnerability to tephra fall impacts.

2015
Understanding agricultural impact from tephra hazards and their causal mechanisms is vital when developing mitigation and recovery strategies. It is well documented that tephra can impact agricultural systems. However, forecasting likely impacts has been challenging and focused on creating generalised models where impacts typically increase with tephra
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