Yesterday and today there where two tremor spikes in Katla volcano. This follows a higher then normal background noise that I cannot directly trace only to wind as I did first think. What is going on is not clear, but it remains a bit of events just before the July 1999 minor eruption (suspected). But it has been speculated by scientist that event was related to inflation event deep inside Katla volcano systems. But the actual fact remains unclear. More information on the event in July 1999 can be read here (in Icelandic).
Pictures from the year 1999 of the harmonic tremor event in July that year.
There was also special note on this tremor chart here from skh SIL station (now gone). But in the year 1999 this signal was most clear on Snæbýli SIL (snb). But today this signal appears to be most clear on Goðabunga SIL station and Eystri-Skógar SIL (esk) SIL station. I do not know what the difference is. But it clearly is something.
Please note that all earthquakes have been cleared from this old SIL tremor plots.
Current day activity in Katla volcano looks like this on the SIL stations where it is most clearly seen.
It is hard to know for sure what this signals means. But I am sure that this signals are going to mean something someday. But when is hard to know.