page_title: Eldfell
section_title: Destruction of houses, creation of land
hierarchical_section_title: Eldfell / Destruction of houses, creation of land
caption_attribution_description: Vestmannaeyjar, Iceland
context_page_description: Eldfell is a volcanic cone just over 200 metres high on the Icelandic island of Heimaey. It formed in a volcanic eruption, which began without warning on the eastern side of Heimaey, in the Westman Islands, on 23 January 1973. The name means Hill of Fire in Icelandic.
  The eruption caused a major crisis for the island and nearly led to its permanent evacuation. Volcanic ash fell over most of the island, destroying around 400 homes, and a lava flow threatened to close off the harbour, the island's main income source via its fishing fleet. An operation was mounted to cool the advancing lava flow by pumping sea water onto it, which was successful in preventing the loss of the harbour.
  After the eruption, the islanders used heat from the cooling lava flows to provide hot water and to generate electricity. They also used some of the extensive tephra, fall-out of airborne volcanic material to extend the runway at the island's small airport and as landfill on which 200 new houses were built.
context_section_description: Houses close to the rift were soon destroyed by lava flows and tephra fall. A few days after the eruption began, the prevailing wind direction moved to the west, resulting in extensive tephra falls over the rest of the island, causing extensive property damage. Many houses were destroyed by the weight of the ash fall, but crews of volunteers working to clear the ash from roofs and board up windows saved many more. By the end of January, tephra covered most of the island, reaching 5 metres (16 ft) deep in places. Apart from falling ash, some houses were also burned down by fires caused by lava bombs, or overridden by advancing lava flows.
  By early February, the heavy tephra fall had abated, but lava flows began to cause serious damage. Submarine activity just north of the fissure severed an electric power cable and a water pipeline which supplied electrical power and water from the Icelandic mainland, and lava began to flow towards the harbour, a situation which caused serious concerns - if the harbour was destroyed, the island's fishing industry would be devastated. By early May, about 300 buildings had been engulfed by lava flows or gutted by fire and 60-70 homes had been buried by tephra.(Richard & James, 1983) As Heimaey was responsible for some 3% of Iceland's GNP, the effect on the whole country's economy would be significant. Efforts to prevent the loss of the harbour are described further below.
  Lava flows also moved into the sea east of the island, creating new land that would eventually add over 2 square kilometres (0.77 sq mi) to the island, and into the eastern parts of town, destroying several hundred houses. The flows were thick and blocky ʻaʻā lava (Icelandic: apalhraun) flows, and covered the ground to average depths of about 40 metre (130 ft), reaching 100 metre (330 ft) thick in places. Later on in the eruption, a surge of lava destroyed one fish processing plant and damaged two others, and also demolished the town's power generating plant.
  Despite the eruption's close proximity to the town and the extensive property damage, only one fatality could be attributed to the eruption - a man who had broken into a chemist's store to acquire drugs was suffocated by toxic fumes. Carbon dioxide, with small amounts of poisonous gases, became concentrated in many buildings partially buried by tephra, and several other people were affected when entering these buildings.
  Efforts to mitigate the hazards presented by the accumulation of poisonous gas included the building of a large tephra wall to divert gases away from the town, and the digging of a trench to channel away the CO₂ (carbon dioxide). These defences were only partially effective, as they relied on the assumption that the gases were produced at the vent, and flowed into the town from there. It is believed that as least some of the CO₂ originated deep within the volcanic conduit and percolated through older volcanic rocks, rising directly into the town.
caption: A concrete water tank, partly crushed by lava
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