Notification of change in aviation color code

Grímsvötn

Time: 15. Jan 2025, 13:19 GMT

Color code:  Yellow 

Volcano id: 373010

Activity summary:
In the last couple of hours tremor recorded at the seismic station on Grímsfjall has risen sharply. Similar dynamics has been observed during previous glacial floods from Grímsvötn and it is not unusual when a flood is reaching its peak discharge. Currently there are no indications of volcanic tremor or elevated seismicity around Grímsvötn. Knowing that an eruption has been triggered in previous flood events, it is uncertain how this event will develop, and the occurrence of an eruption cannot be excluded. As such, as a precautionary action, the aviation color code is elevated to yellow for the time being.

Cloud height:
No eruption ongoing.

Other cloud information:
No eruption ongoing.

Remarks:
This observed increase in tremor is related to the ongoing glacial flood which started at the end of last week. It is likely reflecting an increase in the geothermal activity due to the depressurization of the system when a significant water volume is drained from the lake. IMO continues monitoring the area closely.