The eruption in Eyjafjallajökull itself began on April 14th, 2010, when fissures opened within the caldera. The eruption site was under the glacier, so a phreatomagmatic eruption began, which is an explosive eruption, which caused heavy tephra production and a high rising eruption plume. At the onset of the eruption, Eyjafjallajökull was covered by dense clouds and fog, but on the afternoon of the 14th, a small opening in the clouds showed the eruption column for the first time. The photo shown here was taken by Ólafur Eggertsson, farmer at Þorvaldseyri, on the afternoon of the 14th and is the first photograph taken of the eruption from the ground. The eruption would last from 14th of April until the 22nd of May, or for 39 days, and is divided into four phases depending on the type of activity the eruption had.