Measurements, made at Nýsköpunarmiðstöð Íslands, show, as was to be expected, that the particle size is greater closer to the eruption site.
However, one (18.4) of the two samples taken 20 km away, is very similar to the one taken nearly 60 km away (15.4).
The sample collected on 15.4 by Sigurður Reynir Gíslason and on the 17 and 18. 4 by Guðrún Larsen and Ármanni Höskuldssyni.
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