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ash particles ash phase ash production ash-clouds Axlargigur black clouds black smoke block fountains block jets block showers bocchas bomb phase cloud balls colour column 124m column from Oxl column from Top condensation dark column dark smoke Dark-grey column darker dense lava dew point duction Eruption of Hekla explosion craters explosion in Oxl explosive activity fluid lava fountain of blocks fracture funnel glowing lava Grey column heavy detonations height intervals Large black column lava crater lava jet lava masses Light-grey column lighter m/sec magma level meteoric origin meteoric vapour observations outrush pumice phase rapid succession rise rumbling seems separate explosions sharp detonation shock wave shower of blocks small black columns small white columns smoke from Oxl sound Stromboli surface temperature thrown tidal forces Trausti Einarsson vapour rushes velocity viscous visible sound-wave volcano water vapour white cloud white inert smoke white smoke