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Akureyri AsolfsstaSir Asolfur awake in bed awakened beginning canic cloud balls colour condensation level convective dark displacement distance earthquake occurred earthquake shocks east equation erup eruption began Eruption of Hekla eyewitnesses farm house felt fissure Galtalaekur Geysir Haraldur Haukadalur heard heat of condensation heavy detonations HeiSi pictures Hekla eruption Holar Holtsmuli Hreppholar hydrostatic equation I>orsteinn Iceland initial km level km SSW Litla Hekla looked loud roar m/sec magma main column March 29 morning of March mountain night before March noticed o'clock Oddur Olafur Photo Porvaldur Agustsson photographs Porarinsson Porvaldur Agustsson Fig pumice Rangarvellir reached a height rose rumbling noises rushing sound saw the cloud seismograph Selsund SigriSur Sigtryggsson Sigurjon Palsson SigurSsson SkarS slight tremor stratosphere summit crater taken temperature Thorkell Thorkelsson told to S.I torsteinn Trausti Einarsson troposphere Vatnsleysa pictures velo velocity vertical visible eruption volcanic cloud water vapour Weather Bureau Westman Islands wife wind window