The link to the full article in english if your Icelandic is a bit rusty!
I object to your scaremongering title. It does NOT state that in the source material anywhere. It says that the flow may take 4 to 5 days to reach maximum volume which is NOT the same as an eruption.
If you can find the full article (it is out there somewhere) then this goes into great detail about the 1996 sub-glacial eruption at Grimsvotn and subsequent jökulhlaups
A jökulhlaup (or glacier burst) is a glacial outburst flood. It is an Icelandic term that has been adopted by the English language. It originally referred to the well-known sub-glacial outburst floods from Vatnajökull, Iceland which are triggered by geothermal heating and occasionally by a volcanic sub-glacial eruption, but it is now used to describe any large and abrupt release of water from a subglacial or proglacial lake/reservoir.
Note that it says geothermal heating and occasionally by a volcanic sub-glacial eruption. In other words it does not have to erupt to be melting.
The plots for Grimsvotn are showing increased earthquake frequencies but the harmonic tremor frequencies seem to be relatively steady.
Perhaps you would care to quote your sources for the increased tremor/GPS?
edit on 31/10/2010 by PuterMan because: Ah, the inevitable speeling
erra 
