Hrómundartindur | |
---|---|
Highest point | |
Elevation | 540 metres (1,770 ft) [1] |
Coordinates | 64°04′N 21°13′W / 64.067°N 21.217°W |
Geology | |
Mountain type | central volcano |
Last eruption | 3500 BCE |
Selected geological features near the Hrómundartindur volcanic system (red outline) and its
Holocene lava flows (violet shading). Other shading shows: calderas, central volcanoes and fissure swarms, subglacial terrain above 1,100 m (3,600 ft), and seismically active areas. Clicking on the image enlarges to full window and enables mouse-over with more detail.
[2] |
Hrómundartindur (Icelandic pronunciation: [ˈr̥ouːˌmʏntarˌtʰɪntʏr̥] ) is a mountain in Iceland north of Hveragerði with an elevation of 540 metres (1,770 ft). [1] It to the east of Hengill and is the central volcano of an adjacent 25 km (16 mi) long Hrómundartindur volcanic system, which contains the Ölkeduháls geothermal field. [3] [1] 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. [3] To the north-east are multiple tindars, [3] and there is a Holocene lava flow called Tjarnahnúkshraun which covers 4 km2 (1.5 sq mi) with a volume of 0.03 km3 (0.0072 cu mi). [4] [3] The lava ranges from picrite basalt, being predominantly tholeiite basalt with some basaltic andesite. [3]
During 2017 and 2018 GPS and seismic studies were consistent with either hydrothermal fluid or magma increase at a depth of approximately 5–7 km (3.1–4.3 mi) within the inferred brittle-ductile transition zone of the area centred at Ölkelduháls, between Hengill and Hrómundartindur. This volume had had been contracting between 2006–2017, and was about 3 km (1.9 mi) north-west from an area of uplift between 1993 and 1999. [5]
Hrómundartindur | |
---|---|
Highest point | |
Elevation | 540 metres (1,770 ft) [1] |
Coordinates | 64°04′N 21°13′W / 64.067°N 21.217°W |
Geology | |
Mountain type | central volcano |
Last eruption | 3500 BCE |
Selected geological features near the Hrómundartindur volcanic system (red outline) and its
Holocene lava flows (violet shading). Other shading shows: calderas, central volcanoes and fissure swarms, subglacial terrain above 1,100 m (3,600 ft), and seismically active areas. Clicking on the image enlarges to full window and enables mouse-over with more detail.
[2] |
Hrómundartindur (Icelandic pronunciation: [ˈr̥ouːˌmʏntarˌtʰɪntʏr̥] ) is a mountain in Iceland north of Hveragerði with an elevation of 540 metres (1,770 ft). [1] It to the east of Hengill and is the central volcano of an adjacent 25 km (16 mi) long Hrómundartindur volcanic system, which contains the Ölkeduháls geothermal field. [3] [1] 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. [3] To the north-east are multiple tindars, [3] and there is a Holocene lava flow called Tjarnahnúkshraun which covers 4 km2 (1.5 sq mi) with a volume of 0.03 km3 (0.0072 cu mi). [4] [3] The lava ranges from picrite basalt, being predominantly tholeiite basalt with some basaltic andesite. [3]
During 2017 and 2018 GPS and seismic studies were consistent with either hydrothermal fluid or magma increase at a depth of approximately 5–7 km (3.1–4.3 mi) within the inferred brittle-ductile transition zone of the area centred at Ölkelduháls, between Hengill and Hrómundartindur. This volume had had been contracting between 2006–2017, and was about 3 km (1.9 mi) north-west from an area of uplift between 1993 and 1999. [5]