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Home Science News Earth Science

Potential long-term volcanic activity on Iceland’s Reykjanes Peninsula

June 26, 2024
in Earth Science
Reading Time: 3 mins read
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The 2024 Sundhnúkur eruption - main cone.
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Given the volcanic activity on Iceland over the last three years, researchers from six universities anticipate recurring, moderately sized eruptions of similar style in the coming years to decades. They therefore stress the need for preparedness in view of the risks posed to local populations and critical infrastructure. Their study was recently published in the scientific journal Terra Nova.

The 2024 Sundhnúkur eruption - main cone.

Credit: L. Krmíček

Given the volcanic activity on Iceland over the last three years, researchers from six universities anticipate recurring, moderately sized eruptions of similar style in the coming years to decades. They therefore stress the need for preparedness in view of the risks posed to local populations and critical infrastructure. Their study was recently published in the scientific journal Terra Nova.

“The study uses information from local earthquakes and geochemical data on the erupted magma through time to reveal the geological processes behind these recent Icelandic eruptions. A comparison of these eruptions with historical events provides strong evidence that Iceland will have to prepare and be ready for this volcanic episode to continue for some time, possibly even years to decades,” says Valentin Troll, Professor of Petrology at Uppsala University.

The study examines eruptions that began in 2021 in the Svartsengi-Fagradalsfjall-Krýsuvík area, noting the significant impact on local communities, including the evacuation of the entire town of Grindavik. An international team of scientists, including researchers from Uppsala University (Sweden), the University of Iceland, the Czech Academy of Sciences, Brno University of Technology (Czechia), the University of Oregon (USA) and the University of California at San Diego (USA) used earthquake data and geochemical analysis of lava and tephra samples. They have uncovered critical details about the geological processes behind these eruptions. Historically, Iceland experiences volcanic eruptions every three to five years. The recent eruptions, however, suggest a potentially extended period of activity on the Reykjanes Peninsula. Since 2021, there have been seven fissure eruptions.

“Based on prior eruptive behaviour, this pattern is likely to continue into the future, posing considerable risk to the local population and to important infrastructure, such as Keflavík Airport, several geothermal power plants, the Blue Lagoon tourist spa, and population centres like Keflavík, Grindavík, and Greater Reykjavik,” Troll continues.

A key finding of the study is the interconnected nature of the magma plumbing system beneath the peninsula. Geochemical and seismic data indicate that the eruptions are fed from a shared magma reservoir approximately 9–12 km deep beneath Fagradalsfjall, rather than separate sources or a larger peninsula-wide reservoir. This is why the researchers suggest a recurring pattern of eruptions in the coming years to decades.

“Our findings provide valuable information for anticipating and managing future volcanic activity on the Reykjavik Peninsula. We would like to stress the need for preparedness,” says Frances Deegan, Researcher at Uppsala University and co-author of the study.



Journal

Terra Nova

DOI

10.1111/TER.12733

Method of Research

Data/statistical analysis

Article Title

The 2021, 2022 and 2023 eruptions of Fagradalsfjall Fires, Reykjanes Peninsula Iceland

Article Publication Date

26-Jun-2024

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