Heiðarsporðar volcano
fissure vent 490 m / 1608 ft
Iceland, 65.58°N / -16.82°W
Current status: normal or dormant (1 out of 5) | Reports
Heiðarsporðar volcano books
Iceland, 65.58°N / -16.82°W
Current status: normal or dormant (1 out of 5) | Reports
Heiðarsporðar volcano books
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Typical eruption style: effusive
Heiðarsporðar volcano eruptions: around 300 BC
Heiðarsporðar volcano eruptions: around 300 BC
| Time | Mag. / Depth | Distance | Location |
Background:
The Heidarspordar volcanic system in the Northern Volcanic Zone is about 22 km long, consisting of a fissure swarm and a central volcano defined by high eruptive activity and silicic rocks.It is embryonic, starting to develop in the marginal area of two adjacent fissure areas, Krafla and Fremrinámar, producing large-volume eruptions. No geothermal activity is present. Magma composition ranges from olivine-tholeiite through tholeiitic basalt and basaltic andesite to dacite. Characteristic activity consists of effusive basaltic eruptions and small predominantly effusive silicic eruptions. It has shown rather low activity in the Holocene but has produced substantial basaltic lava flows. Two eruptive periods have occurred in Holocene time separated by over 8,000 years. The last eruption took place about 2,200 years ago, producing a lava flow covering about 220 km2 and extending 60 km from source.
Source: GVP
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