Hrómundartindur () is a mountain in Iceland north of Hveragerði with an elevation of . It to the east of Hengill and is the central volcano of an adjacent long Hrómundartindur volcanic system, which contains the Ölkeduháls geothermal field. Like Hengill this area is close to the south-eastern triple junction of the Hreppar microplate, is seismically active, and associated with the Western volcanic zone and the South Iceland seismic zone. To the north-east are multiple tindars, and there is a Holocene lava flow called Tjarnahnúkshraun which covers with a volume of . The lava ranges from picrite basalt, being predominantly tholeiite basalt with some basaltic andesite.
Activity
During 2017 and 2018 GPS and seismic studies were consistent with either hydrothermal fluid or magma increase at a depth of approximately within the inferred brittle-ductile transition zone of the area centred at Ölkelduháls, between Hengill and Hrómundartindur. This volume had been contracting between 2006–2017, and was about north-west from an area of uplift between 1993 and 1999.
See also
Volcanism of Iceland List of volcanic eruptions in Iceland List of volcanoes in Iceland
References
External links Hrómundartindur in the Catalogue of Icelandic Volcanoes