Hekla: a Notorious Volcano |
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active already amount appeared average became become began beginning bombs carried caused ceased changes cloud column completely considerable continued covered cubic metres damage dark direction distance districts east edge erup estimated explosions farmers farms fell fire fissure fluorine formed front glowing greatest half heard height Hekla eruption Iceland increased July June known land lasted later Lava Crater lava flow length less lumps magma mainly March measured mentioned metres per second middle minutes months morning mountain nearly night observed occurred opened phase places possible powerful probably produced pumice reached ridge rising river rose seemed seen Shoulder Crater showed side similar Skjólkvíar slope smoke sometimes soon Southern southwest southwestern sq km start started stream Summit Crater taken tephra fall tephra layer tephra sector thickness tion volcano volume western wind