For Katla 1918 the lack of fines in the surface samples on the outlet glaciers indicates preferential removal of the fines by melt water, as the tephra layer is exposed by surface melting of the ice.
Skortur á fínefni á gjóskunni úr Kötlu bendir til að hluti fínefnisins skolist í burtu vegna bræðsluvatns á yfirborði jökulsins.