Lightning Effects on the Grain Size Distribution of Volcanic Ash

Lightning Effects on the Grain Size Distribution of Volcanic Ash

Natural volcanic ashfall samples were examined, and high‐current (~100 kA) electrical impulse experiments were conducted to reveal the changes in grain size that can occur during lightning discharge. Experiments on pseudo ash samples manufactured from volcanic deposits of both rhyolitic and basaltic...

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Veröffentlicht in:Geophysical research letters 2019-03, Vol.46 (6), p.3133-3141
Hauptverfasser: Genareau, K., Wallace, K. L., Gharghabi, P., Gafford, J.
Format: Artikel
Sprache:eng
Schlagworte:
Aggregates
ashfall
Bubbles
Deposits
Electric pulses
Eruptions
Experiments
Fragmentation
Grain size
Grain size distribution
High temperature
Lightning
Lightning discharges
Lightning effects
LIVS
Particle size
Particle size distribution
Pavlof
Pumice
redoubt
Size distribution
Spheres
Spherules
Volcanic activity
Volcanic ash
Volcanic deposits
Volcanic eruptions
volcanic lightning
Volcanoes
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Beschreibung
Zusammenfassung:Natural volcanic ashfall samples were examined, and high‐current (~100 kA) electrical impulse experiments were conducted to reveal the changes in grain size that can occur during lightning discharge. Experiments on pseudo ash samples manufactured from volcanic deposits of both rhyolitic and basaltic composition show that aggregates of very fine grained ash particles (100 μm in size. In some cases, bubbles
ISSN:0094-8276
1944-8007
DOI:10.1029/2018GL081298