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a-a lava Agnar Kofoed-Hansen andesite April ash fall ash was carried Askja Axlarbrekka basalt Burfell crater row craters were active cubic km dacite damage districts east erup eruption began eruption cloud eruption column eruption fissure eruption of Hekla eruption started explosion craters farmers farms fissure opened Flj6tshlid flow of lava fluorine content fluorine poisoning formed glowing Gudmundur Hekla area Hekla eruption Hekla fissure Hekla lava Hlidargigar craters June land lava bombs Lava Crater lava flow lava fountain lava front lava stream livestock lumps magma main crater mainly metres per second million cubic metres moun mountain Mundafell Naefurholt night northeast northeastern Oldugigar pumice Rangarvellir reached a height rhyolitic Shoulder Crater Skj61kviar Southern Craters southwestern sq km Summit Crater summit of Hekla summit ridge tephra eruption tephra fall tephra layer tephra sector tephra that fell tephra was carried thickness Thj6rsa Thj6rsardalur tion Vatnsnes vicinity of Hekla volcano xenoliths