Three days ago (16-June-2015) a small glacier flood started in Skaftárkatlar cauldrons in Vatnajökull glacier, says Jón Frímann’s website.
The main risk from this flood are the gases released into the air once the glacier water gets into the river, it is the advised that people stay away from the glacier rivers called Skaftá …. It is unclear how big this glacier flood is going to be and what cauldron is emptying.
Following this type of glacier flood a peak of harmonic tremor is detected from the cauldron that is emptying, it is thought that this is due to the hydrothermal vents (hot springs) that power those cauldrons start to boil when the pressure is released.
http://www.jonfr.com/volcano/?p=5710
Thanks to Sonya Porter for this link
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