On 23 June the Icelandic Meteorological Office (IMO) stated that the water level of the Skaftá river at Sveinstindur (the closest gauging station at 28 km downstream from the ice margin) and electrical conductivity both rose in recent days, indicating the beginning of a glacial outburst flood (jökulhlaup), originating from Grímsvötn’s Western Skaftá ice cauldron.
The western ice cauldron last drained in June 2015. The discharge rate of Skaftá at Sveinstindur was 112 m³/s. IMO warned that hydrogen sulfide released from the floodwater as it drains is particularly potent at the river outlet from the ice margin, where concentrations may reach poisonous levels.
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June 30 , 2016. Grímsvötn , Iceland :
Elevation 1719 m
Source : GVP
Photo : Freysteinn Sigmundsson, 2004