This morning (11. March 2023) at 07:02 UTC an earthquake with magnitude of Mw3,1 took place in western part of Katla volcano. This earthquake happened in Katla volcano caldera rim. The depth was 1,1 km. This was a single earthquake, at the writing of this article.
Since this earthquake there has not been any new earthquake activity in Katla volcano. I am not sure why that is, but it there’s a chance this earthquake activity might just be over. There has been a lot of frost quakes in last few hours, because of a cold weather happening in Iceland. With freezing going down to -20C in some areas.
She is maybe just shivering! In -20c .. we’d be too! The other few which are juxtaposed also correlate to your assessment. It is somewhat difficult to obtain an accurate pinpointed measurement of a cryoseism due to how Ice allows sound to travel long distances from the initial frequency. It is a very large ice cap though, & these are as you say, probable. 😉