Grimsvötn Volcano
A glacial flood (jökulhlaup) from Grímsvötn volcano within Vatnajökull glacier has started.
Preliminary measurements from the university of Iceland estimate a small flood as a low water level (=fifth the volume of the last flood) occurs in the volcano.
The reason for this meltwater is a continuing subside of the ice sheet on top of the volcano. The surface has sunk by 3 meters over the past few days.
The meltwater has made its way under the glacier and is expected to occur very likely on Tuesday in Gígjukvísl where it is supposed to last for several days.
Thus, the Volcanic Alert Level was raised from "Green" to "Yellow".
Jökulhlaup is an Icelandic term for glacier outburst - once enough water has accumulated beneath the rims of the glacier, it can lift it and surge out, and/or melt and erode itself a channel through its bottom, to exit in a massive, violent glacial flood (literally "glacial run").
Source: Icelandic Meteorological Office volcano activity update 12 October 2022
Update 10/18:
The glacial flood (jökulhlaup) from Grímsvötn volcano continues.
The Icelandic Meteorological Office (IMO) reported that the ice sheet continues to drop and reached about 12 m in total subsidence since 5 October.
Gígjukvísl river discharge is expected to be increase further and reach maximum discharge a day later than maximum discharge from Grímsvötn. The maximum discharge rate from the sub-glacial lake is expected to be about 500 m3/s and given similar values of discharge during the peak summer glacier melt, it nonetheless won't affect any infrastructure such as roads or bridges.
Since the morning of 12 October, signals of floodwater level have been detected in webcams.
Therefore, the Volcanic Alert Level for the volcano was raised to Yellow.
Source: Icelandic Meteorological Office volcano activity update 13 October 2022
The Icelandic Meteorological Office (IMO) reported that the ice sheet continues to drop and reached about 12 m in total subsidence since 5 October.
Gígjukvísl river discharge is expected to be increase further and reach maximum discharge a day later than maximum discharge from Grímsvötn. The maximum discharge rate from the sub-glacial lake is expected to be about 500 m3/s and given similar values of discharge during the peak summer glacier melt, it nonetheless won't affect any infrastructure such as roads or bridges.
Since the morning of 12 October, signals of floodwater level have been detected in webcams.
Therefore, the Volcanic Alert Level for the volcano was raised to Yellow.
Source: Icelandic Meteorological Office volcano activity update 13 October 2022
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