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April 27 ash column avalanches base basin at Norourbjallar blocks caused centimetres covered crest deposited depth Dorarinsson erosion erupted water Eruption of Hekla eruptive column eruptive fissure farther ﬂat ﬂoes ﬂood water fragments frozen Galtalaekur glacier tongue gorge Grimsvotn and Katla ground Héahraun heat height Hekla hlaups Hella hlaup bombs hlaup course hlaup track hlaup water ice-bergs Iceland intake basin kilometre Kjartansson lava field lava ﬂow lava front lava sheet layer March 29 March 30 maximum melt water metres moraine mountain side mountain slopes muddy névé observation places probably pumice Rangérbotnar Reykjavik ridge river banks rock rushing sand sandy plain scoriae scree sea level seepage seeped side of Hekla slope of Hekla snow drifts specific gravity steam subglacial volcanoes summit surface Svinhagi tepid thawed Thorkell Thorkelsson Trausti Einarsson tuff upper course vesicles volcanic bombs volcano water level width Ytri-Rangé