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The most recent major eruptions occurred in, and from to The first eruption phase ejected olivine basaltic andesite lava  several hundred metres into the air in what is known as an effusive eruption.
The second phase was estimated to be a VEI 4 eruption, which was large, but not nearly the most powerful eruption possible by volcanic standards. By way of comparison, the Mount St.
Helens eruption of was rated as 5 on the VEI, and the eruption of Mount Pinatubo was rated as a 6. This second phase erupted trachyandesite. The direction of the jet stream was unusually stable at the time of the eruption's second phase, continuously southeast.
The resulting meltwater flowed back into the erupting volcano, which created two specific phenomena: The rapidly vaporising water significantly increased the eruption's explosive power. The erupting lava cooled very fast, which created a cloud of highly abrasive, glass-rich ash.
The volcano's explosive power was enough to inject ash directly into the jet stream. Teams from the Icelandic Thisisgrimsby business plan for Search and Rescue were stationed at the eruption site as part of standard safety measures and to assist in enforcing access restrictions.
Scientific observations[ edit ] This eruption was assigned the volcano number  by the Global Volcanism Program. This was the highest plume since the eruption started. Since then, many vapour explosions have taken place.
Shortly afterward, the water level returned to normal and water temperature decreased.
The initial visual report of the eruption was at The eruption was preceded by intense seismicity and high rates of deformation in the weeks before the eruption, in association with magma recharging of the volcano.
Immediately before the eruption, the depth of the seismicity had become shallow, but was not significantly enhanced from what it had been in the previous weeks. The lava was alkali olivine basalt  and was relatively viscouscausing the motion of the lava stream to the west and east of the fissure to be slow.
This indicates that the rate at which magma was flowing into the magma chamber roughly equaled the rate at which it was being lost due to the eruption, giving evidence that this phase of volcanic activity reached equilibrium.
These two erupting fissures shared the same magma chamber, according to geophysicists. No unusual seismic activity was detected at the time the new fissure appeared, nor any crustal expansion according to many seismometers and GPS recorders situated in nearby areas.
As long as the fissure was not near the glacier, the risk of flooding was minimal; however, the fissure could extend into the ice cap, thereby greatly increasing the risk of flooding. Explosive eruption[ edit ] Photograph from satellite Aqua showing the ash plume over North Atlantic at Prior to this event, a large increase in seismic activity was detected between The earthquake swarm was followed by the onset of a seismic eruption tremor.
Meltwater started to emanate from the ice cap around Visual observations were greatly restricted due to cloud cover over the volcano, but an aeroplane of the Icelandic Coast Guard imaged eruptive craters with radar instruments.The tecBRIDGE Business Plan Competition (BPC) is a regional event that celebrates entrepreneurship, innovation and potential in NEPA.
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The eruptions of Eyjafjallajökull were volcanic events at Eyjafjallajökull in Iceland which, although relatively small for volcanic eruptions, caused enormous disruption to air travel across western and northern Europe over an initial period of six days in April Additional localised disruption continued into May The eruption was declared officially over in October , when.