The latests news is that a glacier flood has started in Skaftá river. At the moment this glacier flood does not appear to be big, as there was also a glacier flood in this river last year. Because of this short time, there has not been a lot of water collected in the western cauldron that is emptying now. It was clear today that it was the western cauldron that had emptied when scientists did fly over the area earlier today.
This glacier flood is often early event and has been since the year 1955. Following this glacier flood there is often spike in harmonic tremor because magma goes on the move due to sudden pressure release in this area. So far it has not been able to trigger a eruption in Hamarinn volcano. It remains to be seen if that has changed or not.
Icelandic News about this
Hlaup hafið í Skaftá (Rúv.is, Pictures, Icelandic)
Rennsli eykst í Skaftá (Vísir.is)
Hlaupið komið í Skaftá (mbl.is)