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April 23 assume Axlargigur basaltic blocks bombs close coalescence compact lava considerable consolidated cooling crust crystallization dense lava density depth distance earlier Eruption of Hekla estimate explosive factor ferric iron flood lava flowing lava fluid lava fluidity gas bubbles gases glass glowing Hekla lava higher Iceland increase indicated June June 29 Kjartansson Krossalda later lava appeared lava cake lava crater lava flow lava front lava stream lava surface layer left the crater m/sec magma magnetite molecule Mamp March 31 material measurements melt microlites mounds movement narrow o’clock observations oxydation palagonite phenocrysts Photo Tr plastic lava poises Porarinsson porosity porous lava primary probably pseudocraters pumice pyrometer Rauooldur reached relatively result river scoriae scree seems sideromelan slope spongy lava stagnant temperature thick thin section toothpaste lava toothpaste tongues tunnel unchanged velocity vesicles vesicularity viscosity visited the crater volcanic walls water content