A magnitude 3,1 earthquake took place on 18-January-2018 at 02:14 UTC in Öræfajökull volcano. This earthquake was followed by one magnitude 2,0 earthquake and one magnitude 1,8 earthquake. All other earthquakes where smaller in magnitude.
Earthquake activity in Öræfajökull volcano (green star). Copyright of this image belongs to Icelandic Met Office.
This earthquake activity was followed by an increase in higher frequency noise on the tremor plots around Öræfajökull volcano. This possibly was the swarm of small earthquakes detected in Öræfajökull volcano at the same time. I am not sure at this moment, but I do hope it gets clearer what is happening as more data is collected with increasing activity.
The change in the tremor plot at Fagurhólsmýri SIL station. The change is at the blue line close the end (spikes). Copyright of this image belongs to Icelandic Met Office.
At the moment everything is quiet in Öræfajökull volcano.
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More than a week ago there was talk of another science surveillance flight. However, I think the visibility and conditions have not been good enough ever since, unless it was possible to it yesterday.