After a few months of a period of stability in Eyjafjallajökull volcano after the eruption ended on the 28th of May 2010. There seems to be more instability starting again in Eyjafjallajökull volcano. This instability can so far only be seen on GPS sensors around the volcano. So far the inflation that is starting at medium rate, about 5mm on every 24 hours or so. This is clear when a early results (not error corrected) are checked from Icelandic Met Office GPS network. The trigger for the current instability appears to be a sharp deflation that took place in Eyjafjallajökull volcano few days ago.
Automatic GPS data from 21st of December 2010. The GPS station name is THEY and is on the south slope of Eyjafjallajökull volcano. The sharp deflation appears clearly on the GPS automatic data (not error corrected) and is followed by a sharp inflation period that is currently ongoing. I got a email from a expert that tells me that volcano ash can interfere with the GPS signal. But this does not change my opinion on that a inflation is about to start in Eyjafjallajökull volcano.
It currently remains unclear if this inflation period in Eyjafjallajökull volcano is going to continue. At current time the inflation in Eyjafjallajökull volcano is going to continue. It is also clear that today Eyjafjallajökull volcano is few weeks from re-starting the eruption, as it has not inflated enough to do so. But what is unclear is if this inflation and inflow of new magma under Eyjafjallajökull volcano is going to move around older magma that currently is higher up in the Eyjafjallajökull volcano plumbing after the eruption started earlier this year. For the moment the only that can be done is to wait and see what happens next.
Wikipedia articles on Eyjafjallajökull volcano
Text updated at 23:49 UTC on 21st of December 2010.