Reykjavík and Reykjanesbær (Keflavík) should be fine. Small villages or clusters of grass-roof homes may burn down, but the eruption shouldn’t cause too much damage to civilization. I’m mostly worried about the earthquakes. Reykjavík has 2/3 of the Icelandic population and they’ve been battered with non-stop earthquakes. Just hoping nothing too big comes out, because there are some old buildings.