Good observation. I think this would be highly uncommon anywhere else in the world (at this length) but it's normal for Iceland. The reason is that Iceland's v

Good observation. I think this would be highly uncommon anywhere else in the world (at this length) but it's normal for Iceland. The reason is that Iceland's vulcanism is driven by a hot spot that sits right on top of the middle oceanic ridge (where tectonic plates emerge from the mantle, as opposed to coastal subduction zones where they travel back into the mantle). The ridge is normally on the seafloor and this is one of the very few places where it runs on land. This makes Iceland's volcanism so special and specifically interesting for science. https://en.wikipedia.org/wiki/Iceland_hotspot https://en.wikipedia.org/wiki/Iceland_hotspot