Iceland lies where two major tectonic plates meet. Icelandic volcanism plays a central role. Its diverse landscapes, such as lava fields and dormant craters, bear witness to ongoing geological activity. However, while this phenomenon is impressive, it also poses ecological and human challenges for the island.
Article and photographs by Damien Lafon.
Iceland, at the heart of a unique tectonic dynamic
Iceland lies at the intersection of the Mid-Atlantic Ridge and the Icelandic Mantle Plume. The Mid-Atlantic Ridge forms the boundary between the North American and Eurasian tectonic plates. It contributes to the creation of new oceanic crusts. The mantle plume also injects hot material from the Earth’s mantle. This process increases volcanic activity in the region.
This unique combination explains the high concentration of volcanoes in Iceland. The country has around 130 volcanic systems, some of the most famous of which include:
- Hekla: known as the ‘Gateway to Hell’ in the Middle Ages, it is one of the island’s most active volcanoes.
- Eyjafjallajökull: famous for its 2010 eruption, which brought air traffic in Europe to a standstill.
- Katla: a massive volcano located beneath the Mýrdalsjökull ice cap, closely monitored because of its destructive potential.
Did you know?
Iceland experiences a major volcanic eruption approximately every 4 to 5 years. The Mid-Atlantic Ridge runs directly through Iceland, providing an open-air view of geological processes that are invisible elsewhere.
Landscapes shaped by volcanism
Iceland’s volcanoes have created a diverse landscape, rich in geological formations:
- Lava fields: formed by ancient eruptions, they cover a large part of the island. Among them, the vast plains created by the eruption of Laki in 1783 are still famous.
- Calderas: These large depressions appear after the collapse of a volcano, like the Krafla caldera, emblematic of Iceland’s high plateaux.
- Hot springs and geysers: These phenomena, such as Geysir and Strokkur, are the result of intense geothermal activity linked to volcanism.
These landscapes attract thousands of visitors every year. They make volcanism a major economic asset for Iceland, thanks in particular to ecotourism.
Major volcanic activity
In recent years, Iceland has witnessed significant volcanic activity, particularly on the Reykjanes peninsula. In November 2024, Sundhnúkur erupted, forcing the evacuation of the coastal village of Grindavík. This eruption, the seventh since December 2023 in the region, highlighted the risks posed by lava flows and volcanic gas emissions.
In March 2024, an eruption south-west of Reykjavik led to the formation of a new volcanic fault. These events illustrate the need for constant vigilance and effective preparation in the face of geological hazards in Iceland.
Active and unpredictable volcanism
Volcanic eruptions in Iceland vary in intensity and frequency, but all have significant consequences:
- The eruption of Eyjafjallajökull in 2010: This explosive eruption spewed large quantities of volcanic ash into the atmosphere. It severely disrupted air traffic for several weeks.
- The eruption of Laki in 1783-1784: Considered one of the most destructive in modern history, it released large volumes of toxic gases. These emissions caused famine in Iceland and influenced the global climate.
Icelandic volcanism is also closely linked to the glaciers that cover part of the island. Subglacial eruptions, such as those of Grímsvötn, cause spectacular glacial floods known as jökulhlaups, capable of sweeping away everything in their path.
Did you know?
The Laki eruption released around 15 km³ of lava, altering the global climate for several years. Jökulhlaups can move blocks of ice weighing several tonnes at speeds of up to 50 km/h.
A precious resource: geothermal energy
Iceland’s volcanoes are more than just destructive. It is also an invaluable resource for the country, which uses geothermal heat to generate electricity and heat buildings. Around 90% of Icelandic homes are heated by this renewable energy.
Geothermal power plants like Hellisheiði and Nesjavellir show how Iceland has turned a natural challenge into an economic and environmental advantage. This sustainable use of volcanic energy also serves as a model for other countries.
A universal responsibility
Icelandic volcanism is not just about spectacular scenery: it also reveals the vulnerability of our planet. This phenomenon illustrates the profound links between geological activity, climate and human communities. These complex interactions remind us of how crucial it is to preserve these unique environments, which bear witness to the fragile balance that governs our world.
Did you know?
In 2021, an eruption at Fagradalsfjall, near Reykjavik, attracted thousands of visitors, underlining the growing interest in Icelandic volcanism. Vatnajökull, Europe’s largest ice cap, covers several active volcanoes, including Grímsvötn.
Coexisting with unpredictable nature
Iceland’s volcanoes are both destructive and life-giving. It is an essential pillar of the island’s geological and cultural identity. By using this natural phenomenon as a resource and incorporating its lessons, Iceland is showing how to live in harmony with unpredictable nature. Recent eruptions are also a reminder of the importance of resilience. Finally, they underline the need to cooperate in the face of the natural forces that shape our planet.
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