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

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


Title: Deep-sea fragmentation style of Havre revealed by dendrogrammatic analyses of particle morphometry
Author: Dürig, Tobias   orcid.org/0000-0002-7453-4369
White, J. D. L.
Zimanowski, B.
Büttner, R.
Murch, A.
Carey, R. J.
Date: 2020-09-30
Language: English
Scope: 67
University/Institute: Háskóli Íslands
University of Iceland
School: School of Engineering and Natural Sciences (UI)
Verkfræði- og náttúruvísindasvið (HÍ)
Department: Jarðvísindastofnun (HÍ)
Institute of Earth Sciences (UI)
Series: Bulletin of Volcanology;82(10)
ISSN: 0258-8900
1432-0819 (eISSN)
DOI: 10.1007/s00445-020-01408-1
Subject: Volcanology; Tephra; Particle morphometry; Geosciences; SEM microscopy; Eldfjallafræði; Gjóska
URI: https://hdl.handle.net/20.500.11815/2285

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Citation:

Dürig, T., White, J.D.L., Zimanowski, B. et al. Deep-sea fragmentation style of Havre revealed by dendrogrammatic analyses of particle morphometry. Bull Volcanol 82, 67 (2020). https://doi.org/10.1007/s00445-020-01408-1

Abstract:

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.

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