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Hromundartindur
"Hrómundartindur is a small volcanic system located south of Thingvallavatn lake and immediately east of the Hengill volcanic system. It lies at a ridge-ridge-transform triple junction at the eastern end of the Reykjanes Peninsula, where the west Iceland volcanic zone changes direction from approximately W-E to SW-NE. Hrómundartindur was last active about 10,000 years ago, and displays vigorous geothermal activity at the Ölkeduháls geothermal field. The most recent eruptions in the Ölkeduháls area took place at the end of the latest glacial period, but Ölkeduháls currently contains numerous hot springs, mud pools, fumaroles, and mineral warm springs. Increased seismic activity and slow land uplift beginning in 1994 indicated magma flow into the roots of the volcanic system at 7 km depth. The activity continued for more than 4 years."  -Smithsonian Volcano Archive
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