COPENHAGEN: Icelanders are working round-the-clock to build dykes the size of three-storey buildings to protect a vital power plant and homes from lava flows, since volcanoes near the capital Reykjavik that were dormant for nearly 800 years became active.
The six volcanic systems, which experts forecast will be active for up to three centuries, stretch under Iceland's southwestern Reykjanes peninsula, home to 30,000 people, nearly 8 per cent of the country's total population.
They form an underground meshwork on the peninsula, stretching to the edges of the capital, which has witnessed five eruptions since 2021.
Amid concerns about an imminent eruption, authorities in November began building defence walls around the peninsula's Svartsengi geothermal power plant.
Since then, nearly 100 bulldozers, excavators and haul trucks have been working non-stop around the plant, according to Kristinn Hardarson, who heads operations at energy company HS Orka, the owner of Svartsengi.
In total, some 560,000 cubic meters of gravel and solidified lava rock - enough to fill 20,000 trucks - will be used to protect the plant.
"They have to divert the lava so it flows beside the barriers. If you try to stop it, the lava will just build up and eventually go over the barriers," Vidir Reynisson said, head of Iceland's Civil Protection and Emergency Management.
Construction of defences has also started around the nearby town of Grindavik, home to one of Iceland's key fishing ports and nearly 4,000 residents who were evacuated in December before the most recent eruption north of the town.
The first barrier proved effective in diverting lava away from Grindavik but when fissures opened on the other side of the barrier, lava reached the town and set some houses alight.
Finishing the seven-kilometre half circle around Grindavik is expected to take six weeks, Reynisson said.
It will take roughly twice as much material as was needed at Svartsengi, according to Ari Gudmundsson, a civil engineer at Verkis, an engineering company working on the barriers.
Icelanders first attempted building defence walls on the island of Heimaey when a 1973 eruption ravaged the town of Vestmannaeyjar, forcing its entire population to evacuate.
Numerous eruptions have struck Iceland since, but usually away from towns and critical infrastructure. When volcanic activity began on the Reykjanes peninsula in 2021, fresh attempts at building a defence were made. — Reuters