The volcanoes of Iceland are rift volcanoes that lie upon the mid-Atlantic ridge, where two tectonic plates are pulling apart. These volcanoes typically feature comparatively quiet eruptions, and in sparsely-populated Iceland don't pose much threat to life. The volcano is southeast of the capital Reykjavik, buried under a glacier. Sub-glacial eruptions such as these can pose flooding dangers as the ice is melted from beneath by lava.
Here's a pic taken from video footage, you can see the elongated crater opening that is typical of Icelandic volcanoes.
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