Yesterday (29-January-2021) at 23:34 UTC an earthquake with magnitude of Mw2,4 took place in Grímsfjall volcano (Grímsvötn). There where few smaller earthquakes before and after this largest earthquake. There where no signs of change in harmonic tremor following this earthquake activity.
It has also been reported in the news that glacier plate that is on top of Grímsfjall volcano is now the highest since 1996. Inflation is now taking place in eastern part of Grímsfjall volcano, in a location called Eystri Svíahnúkur. Magma pressure is today (30-January-2021) equal or higher than when the May 2011 eruption took place in Grímsfjall volcano.
Sources / News in Icelandic