Figure 6From: UK monitoring and deposition of tephra from the May 2011 eruption of Grímsvötn, IcelandGrímsvötn tephra shards collected in rainwater in the UK. Those in the top row were collected in Auldearn; those in the bottom row were collected on Fair Isle. Grains are brown-coloured and dominated by bubble-wall shards indicating fragmentation of a vesicular magma with bubble diameters of 5 to 50 μ m.Back to article page