At 19.03 local time the automatic SIL-system in Iceland picked up a strong tremor signal. When this type of tremor signal is visible in Iceland it is normally associated with either a large jökulhlaup (rapid glacial melt outflow) that can become larger than the output of the Amazon River, or it is associated with an eruptive sequence.
In the afternoon there was a moderate swarm of earthquakes between M1 and M1.5. Most of the earthquakes was not visible on the automatic detection system due to disturbance from the current bad weather in Iceland.
The signal conforms to it either coming from Grimsvötn or Thordarhyrna central volcanoes under Vatnajökull.
We are not stating that this is an eruption, just that it is a confirmed strong tremor-signal. As always we await confirmation by the Icelandic Met Office and other relevant Icelandic authorities.
We will update this one as we get to know more.
Update: There is a lack of low frequency tremor in the seismic signals indicating that this may indeed be related to a Jökulhlaup. But, we will have to wait and see. The seeing part may though be a bit elusive since it is in the middle of the night, and that there is bad weather in Iceland.