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The influence of vegetation cover on the grain-size distributions and thicknesses of two Icelandic tephra layers

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Date
04/08/2022
Author
Morison, Conner
Streeter, Richard
Keywords
Eyjafjallajökull
Grímsvötn
Volcanic ash
Granulometry
Eruption source parameters
Remobilisation
Tephrovolcanology
GB Physical geography
DAS
AC
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Abstract
Grain-size distributions and thicknesses of tephra layers are used to reconstruct characteristics, dynamics, and hazards of explosive volcanic eruptions, but the extent to which the preservation of tephra is influenced by depositional environments is unclear. This paper analyses grain-size distributions and thicknesses of tephra layers produced by the Eyjafjallajökull (2010) and Grímsvötn (2011) eruptions. We collected 110 tephra samples and layer thickness measurements from 86 sites at two locations in southern Iceland. Areas of different vegetation cover have varying capacities to affect rates of tephra erosion, retain fallout, or capture remobilised tephra. The Grímsvötn tephra was somewhat coarser-grained and thicker in areas of birch woodland than in adjacent moss heath, but no comparable differences in the Eyjafjallajökull tephra were observed. The spatial variability (over tens of metres) of median particle-size and layer thickness is low, providing confidence that relatively few samples and measurements may be required to capture fallout characteristics.
Citation
Morison , C & Streeter , R 2022 , ' The influence of vegetation cover on the grain-size distributions and thicknesses of two Icelandic tephra layers ' , Volcanica , vol. 5 , no. 2 , pp. 227-248 . https://doi.org/10.30909/vol.05.02.227248
Publication
Volcanica
Status
Peer reviewed
DOI
https://doi.org/10.30909/vol.05.02.227248
ISSN
2610-3540
Type
Journal article
Rights
Copyright © The Author(s) 2022. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License, which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/25854

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