Bardarbunga volcano update: Formation of depression in glacier, worries about possible subglacial eruption
Mi, 3. Sep 2014, 16:5416:54 PM | VON: T
Radar image of the newly formed depression both under and north of the glacier (Uni. Iceland)
The eruptive activity at the Holorhaun fissure has remained stable, but ongoing deformation, although slower now, continues to worry scientists monitoring the events.
Earthquakes around Bárdarbunga today - a significant portion is under the ice cap where also deformation occurred (IMO)
The output of lava has been estimated to be around 150 cubic meters per second, and the lca flows continue to expand mainly to the ENE, towards the Jökulsá á Fjöllum river. The surface of land covered by the lava flows was reached 7.2 km2.
However, GPS and radar measurements indicate that more lava is being intruded into the dyke at depth than what is erupted at the surface. It is feared that new fissures open, or that the existing one might become longer, and possibly open under the ice cap. In that case, significant ash plumes and floods would be generated as magma would react violently with ice and water.
A graben, i.e. a depression bounded by parallel faults caused by extension stress, has been detected in the area. It is between 500 and 1000 m wide and extends both north of and 2 km into the the Dyngjujokull glacier. Parts of the newly formed depression is in areas where the thickness of the ice is only 150 m.
Mi, 3. Sep 2014, 06:05
Bardarbunga volcano update: Fissure eruption decreases, but earthquakes pick up again - what's next?
Important changes seem to be under way. The fissure eruption with its spectacular lava emission at the surface still continues, but has decreased a lot since the first two days. ... Read all