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Latest news:

Hengill volcano (Iceland) activity update: small earthquake swarms under Hengill volcano caused by pumping of water
Saturday, Feb 25, 2012
Small earthquake swarms occurred at Hengill volcano on 24 and 25 Feb 2012. The seismic activity is thought to be related to the hydrothermal power pla... [more]
Hengill volcano (Iceland) activity update: Small earthquake swarm caused by pumping of water
Thursday, Jan 19, 2012
A small earthquake swarm started in Hengill volcano on 17 Jan 2012 in the area of the Orkuveita Reykjavíkur hydrothermal plant that has been pumping d... [more]

Hengill volcano

Crater rows 803 m (2,634 ft)
Iceland, 64.18°N / -21.33°W
Current status: dormant (1 out of 5)
last update: 25 Feb 2012 (small earthquake swarms under Hengill volcano caused by pumping of water)
Typical eruption style:

Effusive (lava flows).


Hengill volcano eruptions: none confirmed during historic times
The Hengill volcanic system, cutting through Thingvallavatn lake, consists of a series of NE-SW-trending fissure vents, crater rows, and small shield volcanoes occupying a strongly faulted graben.

Background:

Hengill is the easternmost of a series of four closely spaced basaltic fissure systems that cut diagonally across the Reykjanes Peninsula and lies at the triple junction of the Reykjanes Peninsula volcanic zone, the Western volcanic zone, and the South Iceland seismic zone. Postglacial lava flows surface much of the volcanic system. The latest eruption was radiocarbon dated about 1900 years before present. An eruption in the Hellisheidi area once thought to have occurred around 1000 AD at the time of a meeting of the Icelandic parliament at Thingvellir is now known to have occurred at a vent about 5 km away in the Brennisteinsfjöll volcanic system. Geothermally heated greenhouses, hot springs, and geysers are found at the Hveragerdi thermal area.
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Source: GVP, Smithsonian Institute