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What will the imminent volcanic eruption in Iceland really look like?

November 17, 2023
in Science
What will the imminent volcanic eruption in Iceland really look like?
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Lava erupting from a small volcano with a river of lava flowing away

A previous volcanic eruption in Iceland’s Reykjanes Peninsula. The imminent eruption near Grindavík will likely look similar. (Image credit: Getty Images)

To keep up with the latest developments about the impending eruption, check out our live updates page.

Officials in Iceland are preparing for an imminent volcanic eruption from a submerged tunnel of magma, which could unleash superhot lava flows on nearby towns, a vital power plant and an iconic tourist destination.

The tunnel of molten rock, known as a magma dike, stretches for around 9.3 miles (15 kilometers) between Grindavík and Sundhnúk in Iceland’s Reykjanes Peninsula. The underground dike has triggered thousands of earthquakes and caused significant ground deformation that has opened up sinkholes in the surface and cracks in nearby buildings and roads. As a result, local residents have been evacuated. 

But this is likely just the beginning.

The Icelandic Meteorological Association (IMO) has warned that a full-blown eruption is almost certainly on its way. And other experts have suggested that the eruption could be part of a more explosive, centuries-long eruption phase for the region. 

Related: Supervolcano ‘megabeds’ discovered at bottom of sea point to catastrophic events in Europe every 10,000 to 15,000 years

So what exactly is happening underground? What would an eruption actually look like? And how damaging could an outburst really be?

What’s happened so far? 

On Oct. 25, seismic activity began to ramp up in the area. There were thousands of earthquakes within the space of a few hours — including two major quakes with magnitudes of 3.9 and 4.5. Seismic unrest has continued in the area since then, including a 4.8-magnitude quake on Nov. 9. 

The earthquakes and ground deformation are being caused by magma entering, or intruding, into the dike at multiple points. The vast underground tunnel was first properly mapped on Nov. 11. At the time, the magma was at a minimum depth of about 2,600 feet (800 m) below the surface.

The dike sits on top of an underground crack, or fracture, in the tectonic plate beneath Iceland, Benjamin Andrews, a geologist at the Smithsonian Institute’s National Museum of Natural History and director of the institute’s Global Volcanism Program, told Live Science in an email. As more magma enters the dike from below, the crack will continue to grow, he added. 

If the crack continues to grow and magma gets close enough to the surface, “an eruption will likely occur, ” Andrews said.

What will an eruption look like? 

A river of lava flowing from a volcano in Iceland

Most of Iceland’s volcanic eruption consist of slow-moving lava flows that wind like rivers across the surface. (Image credit: Getty Images)

In general, while Iceland is volcanically very active, eruptions there are quite tame: For the most part, magma slowly seeps out of the ground rather than exploding outward.

The lava is extremely hot, between 2,000 and 2,200 Fahrenheit (1,100 and 1,200 degrees Celsius) and can shoot out of the ground, Malcolm Hole, a volcanologist at the University of Aberdeen, said in a video posted on X (formerly known as Twitter). However, the molten rock has the “same sort of runniness” as golden syrup, so lava flows will move very slowly across the surface, he added. 

The lava also follows Earth’s topography, “the same ways as a river would,” Hole said. This makes it easy to predict where it will move.

Thorvaldur Thordarson, professor of volcanology at the University of Iceland, told the Iceland Monitor that most of the lava would probably move west and into the sea. But “something always goes the other way,” he added.

So how big could this eruption be? “It would likely be broadly similar to the Fagradasfjall eruption in 2021,” when lava flows poured out of the main volcano in the Fagradasfjall volcanic fields, which is also located on the Reykjanes Peninsula, about 6.2 miles (10 km) away, Andrews said. This eruption near constantly spat up magma for more than six months, according to the IMO. 

Similar eruptions have also recently occurred from a baby volcano near Fagradasfjall, which was born in June this year. 

When will it erupt? 

Hikers look at the lava flowing from the erupting Fagradalsfjall volcano near Reykjavik, Iceland, on March 21, 2021.

Hikers get up close and personal to the erupting Fagradalsfjall volcano in 2021. (Image credit: Jeremie Richard/AFP via Getty Images)

The latest IMO statement continues to warn that there is a “significant likelihood of a volcanic eruption in the coming days.” 

But there is no accurate way of telling if the eruption will occur in hours, days or weeks, Andrews said.

There is also still a chance that “the intrusion [of magma into the dike] could end with no eruption,” Andrews said. Although the IMO seems pretty convinced that it will, he added. 

“I predict — if an eruption occurs — that it will occur between a few days to threeish weeks,” Edward W. Marshall, a researcher at the University of Iceland’s Nordic Volcanological Center, told Live Science in a recent article. “If it hasn’t erupted in three weeks, I don’t think it will happen.” After then, “cooling will begin to close the fractures,” he added.

Will an eruption halt air traffic? 

A massive plume of smoke and ash rising from a volcano

An enormous column of ash and smoke billows out of the Eyjafjallajökull volcano in 2010. (Image credit: Paul Souders via Getty Images)

In 2010, the eruption of Iceland’s Eyjafjallajökull volcano created an enormous eruption plume that grounded most air traffic above Europe for more than a week, causing travel disruption for around 7 million people, according to the U.S. Geological Survey.

Unlike most other eruptions in Iceland, the Eyjafjallajökull eruption was very violent. This was because the volcano was covered with a thick sheet of ice, which exploded outward with great force when the magma rose up and made contact with it, Hole said. This unusual explosion meant that more ash, smoke and water vapor were ejected than normal, he added.

But the current volcanic dike is not covered in ice, meaning, “an eruption at the current site of unrest is unlikely to produce an ash cloud similar to that which disrupted air travel in 2010,” Andrews said. Although there will be an eruption plume, he added.

Will toxic gases be released? 

On Nov. 14, IMO sensors near Grindavík detected sulfur dioxide, a toxic volcanic gas, seeping out of the ground, IMO representatives wrote on X. This has led to speculation that an eruption could release high levels of the toxic gas, which could impact anyone who remains in the area. 

“The majority of gas released in an eruption will most likely be water that was originally dissolved in the magma at depth,” Andrews said. However, other gases, including sulfur dioxide and carbon dioxide, will also be released, he added.

During past eruptions in Iceland, such as the eruption of Bárðarbunga in 2014 and 2015, volcanic gases caused problems with air quality in the country, Andrews said. “But I am not aware of any forecasts about potential hazardous gas emissions” from a impending eruption at Grindavík, he added.

Which locations are at risk? 

A geothermal power plant in Iceland with steam rising from vents

The Svartsengi power plant, which is within striking distance of any possible eruption, runs off the same geothermal energy that drives volcanic eruptions. (Image credit: Nejc Gostincar via Getty Images)

Of the two towns that straddle the magma dike, Grindavík is the closest and most at risk, according to the IMO. Most of the town’s roughly 2,800 residents have already been evacuated and are unlikely to permanently return unless the threat of an eruption recedes.  

The Blue Lagoon resort, a famous geothermal spa that attracts more than 700,000 annual visitors, is around 3 miles (5 km) from the dike. The site has been closed to tourists until at least the end of the month, so people will not be in danger. But the lagoon could still be damaged by lava flows.

The geothermal Svartsengi power plant — which provides energy across the country and supplies hot water to local towns and villages — is located around 4 miles (6 km) from the dike. But work has already begun to dig trenches around the site to divert lava away from the site if it heads that way.

Stay up to date on the latest science news by signing up for our Essentials newsletter.

Harry is a U.K.-based staff writer at Live Science. He studied Marine Biology at the University of Exeter (Penryn campus) and after graduating started his own blog site “Marine Madness,” which he continues to run with other ocean enthusiasts. He is also interested in evolution, climate change, robots, space exploration, environmental conservation and anything that’s been fossilized. When not at work he can be found watching sci-fi films, playing old Pokemon games or running (probably slower than he’d like). 

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