There’s other factors to consider. Primarily the total amount of ash and SO2 emitted over time. IIRC, some of these Icelandic volcanoes erupt for a very long time. I’ve been watching the live feed and the fissures seem to be growing?
They appeared to be getting larger to me too.
I was just amazed at the amount of basaltic lava
released in the Pacific Northwest, it covered
an area of 63,000 square miles!!!
Well if it is growing one wouldnt know it because they had hikers at the thing today. Many standing within feet of the largest erupting cone.