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Figure 4 | Journal of Applied Volcanology

Figure 4

From: UK monitoring and deposition of tephra from the May 2011 eruption of Grímsvötn, Iceland

Figure 4

SEM analysis of particles of Grímsvötn tephra deposited at Eskdalemuir on 24–25 May. (a) Typical glass shard, diameter 40 μ m. The cuspate form indicates fragmentation of vesicular magma. (b) SEM-EDS spectrum for shard shown in (a). The intensity is scaled so that the Si-k α peak is the same size for all samples. There is good agreement with reference samples from proximal locations. (c) Aggregate clast, diameter 60 μ m. Component clasts are bubble-wall fragments 1–20 μ m. (d) SEM-EDS spectrum for aggregate clast shown in (c). There is good agreement with reference samples from proximal locations and increased proportions of sodium (Na) and chlorine (Cl).

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