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Deep-sea fragmentation style of Havre revealed by dendrogrammatic analyses of particle morphometry

Durig, T, White, JDL, Zimanowski, B, Buttner, R, Murch, A and Carey, RJ ORCID: 0000-0003-2015-6419 2020 , 'Deep-sea fragmentation style of Havre revealed by dendrogrammatic analyses of particle morphometry' , Bulletin of Volcanology, vol. 82 , doi: 10.1007/s00445-020-01408-1.

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In 2012, the eruption of deep-sea volcano Havre produced an abundance of fine ash at a depth of ~ 1000 m below sea level. In this study the 2D shapes of Havre ash grains retrieved from the seafloor were compared quantitatively with those of particles generated in a suite of different fragmentation experiments, which used remelted rhyolitic rock and pumice from the eruption site. A new statistical data analysis technique, denoted as Dendrogrammatic Analysis of Particle Morphology (DAPM) is introduced. It is designed to compare large numbers of morphometric data sets containing shape information for a set of ash particles to group them by morphological similarities and to visualize these clusters in a dendrogram. Further steps involve t tests and equivalence tests and reveal morphometric differences as well as matching features. The DAPM suggests that the majority of Havre ash was thermohydraulically produced by induced fuel coolant-interaction. A subset of ash particles features an elongated tube morphology. Their morphometry matches that of particles that were experimentally produced by a combination of shearing and quenching, and we infer that the natural particles were formed by synextrusive ash-venting.

Item Type: Article
Authors/Creators:Durig, T and White, JDL and Zimanowski, B and Buttner, R and Murch, A and Carey, RJ
Keywords: particle size, submarine eruption, particle shape analysis, volcanic ash, Havre seamount, induced fuel-coolant interaction, fragmentation mechanisms
Journal or Publication Title: Bulletin of Volcanology
Publisher: Springer-Verlag
ISSN: 0258-8900
DOI / ID Number: 10.1007/s00445-020-01408-1
Copyright Information:

Copyright International Association of Volcanology & Chemistry of the Earth's Interior 2020

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