|Listing||List of volcanoes in Iceland|
|Mountain type||Subglacial volcano|
There is a mechanical interaction between Thordarhyrna and Grimsvötn, despite these volcanoes being relatively far apart, so the eruption in 1902 - 1904 was combined with an eruption from Grimsvötn and had a Volcanic Explosivity Index (VEI) of 4 
- "Archived copy" (PDF). Archived from the original (PDF) on 2012-03-09. Retrieved 2011-05-24. Figure 2.8 shows 7 volcanoes beneath the glacier
- "Archived copy". Archived from the original on 2012-12-21. Retrieved 2011-05-24. Eruptions in Iceland since 1900
- "Archived copy". Archived from the original on 2011-05-27. Retrieved 2011-05-27.
-  Surface and bedrock topography mapped by radio echo sounding
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