There is a small mountain called Fagradalsfjall. The current eruption is just east of it.  And because of that and beacuse the volcanic system  goes by the name of the mountain, the current eruption often goes by that name, especially in English.
The node you are looking for is right by this note. Look here :  https://www.openstreetmap.org/node/8539528378#map=17/63.88913/-22.26934&layers=N
