This page contains scientific data and results from the staff of the Institute of Earth Sciences and various collaborators. The data is posted timely to give maximum information on evaluation of an evolving natural catastrophe. Please respect copyright and authorship of the data.
Grain size of the ash from Eyjafjallajökull eruption - samples from April 28 - Björn Oddsson |
Particle size of the ash from Eyjafjallajökull eruption - Þröstur Þorsteinsson (throsturt@raunvis.hi.is, ThrosturTh@gmail.com) The figure below shows description of the data from 15. April (but same applies to the other dates): 1) Fraction of mass of particles smaller than a give size (the size given on the x-axis). Therefore for the largest particles, around 300 micro-m the fraction is 100%, since all particles smaller, and then about 25% of the total mass is particles smaller than 10 micro-m (PM10, which is familiar to many from Particulate Matter pollution measurements). 2) Shows the mass fraction within each size range. 3) Shows the number of particles within each size range, given that there is 1 particle in the largest size class. We can see that there are then 1 particle of size ~300 micro-m, but 10 thousand of the size 10 micro-m and about a million of the size smaller than 2.5 micro-m. |
Particle size in the ash from Eyjafjallajökull eruption, sample from 15 April 2010 - Þröstur Þorsteinsson (throsturt@raunvis.hi.is, ThrosturTh@gmail.com) The figure below shows (labels in Icelandic): 1) Fraction of mass of particles smaller than a give size (the size given on the x-axis). Therefore for the largest particles, around 300 micro-m the fraction is 100%, since all particles smaller, and then about 25% of the total mass is particles smaller than 10 micro-m (PM10, which is familiar to many from Particulate Matter pollution measurements). 2) Shows the mass fraction within each size range. 3) Shows the number of particles within each size range, given that there is 1 particle in the largest size class. We can see that there are then 1 particle of size ~300 micro-m, but 10 thousand of the size 10 micro-m and about a million of the size smaller than 2.5 micro-m. Samples were measured at Innovation Center Iceland (the first graph above) at the request of The Environment Agency of Iceland. |