Eyjafjallajokull is a glacier-capped stratovolcano in southern Iceland, rising 1,651 meters (5,417 feet) and topped by an ice cap of the same name. Though modest in size, it became the world's most famous volcano in April 2010, when an eruption beneath its glacier sent exceptionally fine ash across European airspace, grounding roughly 100,000 flights and stranding about 10 million passengers in the largest air-travel shutdown since World War II.
Its name, which looks impossible to pronounce, is actually descriptive Icelandic: eyja (island), fjalla (mountain), and jokull (glacier) — literally "island-mountain glacier." It refers both to the ice cap and the volcano hidden beneath it. The rough pronunciation is AY-yah-FYAT-lah-YOE-kootl, a tongue-twister that became a running joke in global newsrooms during the 2010 crisis.
Where Is Eyjafjallajokull?
Eyjafjallajokull sits in southern Iceland, about 125 kilometers (78 miles) southeast of the capital, Reykjavik, and only a few kilometers inland from the Atlantic coast. It rises from the lowlands near the famous Skogafoss and Seljalandsfoss waterfalls, both popular stops along Iceland's Ring Road (Route 1). The ice cap covers an area of roughly 100 square kilometers and feeds several outlet glaciers, including Gigjokull and Steinholtsjokull, which spill down toward the surrounding plains.
The volcano's location is no accident. Iceland straddles the Mid-Atlantic Ridge, the underwater mountain chain where the North American and Eurasian tectonic plates pull apart. Eyjafjallajokull lies within Iceland's southern volcanic zone, a belt of intense activity that also includes its larger and more dangerous neighbor, Katla.
Geology and Glaciovolcanism
Eyjafjallajokull is a stratovolcano — a steep, layered cone built up over hundreds of thousands of years from alternating flows of lava and ash. Iceland's unusual setting, sitting on both a spreading ridge and a deep mantle hotspot, makes it one of the most volcanically active places on Earth, with an eruption somewhere on the island roughly every few years.
What set the 2010 eruption apart was glaciovolcanism: the violent interaction between rising magma and overlying glacial ice. When magma reached the ice-filled summit crater, the heat instantly flash-boiled meltwater, shattering the molten rock into extremely fine, glassy ash particles. These fragments were far smaller and lighter than the ash of a typical "dry" eruption, allowing them to be lofted high into the atmosphere and carried for thousands of kilometers before settling. The same process also triggered glacial outburst floods, known in Icelandic as jokulhlaups, which forced the evacuation of nearby farms.
Key Facts
- Type: Glacier-capped stratovolcano
- Height: 1,651 m (5,417 ft)
- Location: Southern Iceland, ~125 km southeast of Reykjavik
- Ice cap area: ~100 km²
- Tectonic setting: Mid-Atlantic Ridge / Iceland mantle hotspot
- Most famous eruption: April 14 – May 23, 2010
- Dangerous neighbor: Katla volcano, beneath the Myrdalsjokull ice cap
The 2010 Eruption Timeline
The eruption actually unfolded in two distinct phases. It began on March 20, 2010, with a relatively gentle fissure eruption on the volcano's flank at Fimmvorduhals, between Eyjafjallajokull and Myrdalsjokull. This first phase produced spectacular lava fountains that drew tourists and photographers but caused little disruption.
Everything changed on April 14, when activity shifted to the summit crater beneath the ice cap. The magma-ice interaction transformed the eruption's character, generating the fine ash plume that rose about 9 kilometers into the sky. Prevailing winds carried the cloud directly southeast over Europe.
- Ash plume height: ~9 km
- Airspace closed: six days starting April 15
- Flights cancelled: ~100,000
- Passengers stranded: ~10 million
- Estimated cost to airlines: $1.7 billion
The closure of European airspace was the largest since World War II. With flights grounded, some stranded travelers resorted to renting cars, taking trains, or even crossing continents by road to reach home.
Why a Small Eruption Caused So Much Chaos
By volcanic standards, the 2010 eruption was modest. It ranked only about 4 on the Volcanic Explosivity Index — far smaller than catastrophic events like Pinatubo (1991) or Krakatoa (1883). Its outsized impact came from a combination of three factors rather than raw power.
- Ash quality: Glaciovolcanism produced unusually fine, abrasive glass particles capable of melting inside jet engines and clogging fuel and cooling systems.
- Wind direction: Prevailing winds blew the plume straight over Europe's busiest air corridors.
- Modern interconnection: A continent dependent on dense, just-in-time air travel had little tolerance for any disruption.
The episode became a textbook example of how a localized natural event can ripple outward into global economic and logistical consequences.
The Link to Katla
Eyjafjallajokull does not stand alone. Just to the east lies Katla, a much larger and more hazardous volcano buried beneath the Myrdalsjokull ice cap. The two appear to be geologically connected: in three of the four historically documented eruptions of Eyjafjallajokull, Katla followed with an eruption within months to a couple of years.
Katla last erupted significantly in 1918, producing enormous glacial floods. Because it has the potential to release far more ash and meltwater than its smaller neighbor, volcanologists monitored it intently after 2010. As of today, no linked eruption has occurred, but Katla remains one of the most closely watched volcanoes in Iceland.
Impact on Aviation Policy
Before 2010, the rule for flying near volcanic ash was blunt and simple: any detectable ash meant no flying. The Eyjafjallajokull crisis exposed how costly that zero-tolerance approach could be and pushed regulators toward a more nuanced system.
- New thresholds: Authorities defined specific ash-concentration limits, allowing flights to resume in low-density ash rather than shutting everything down.
- Better detection: The crisis spurred investment in ground-based lidar, satellite monitoring, and improved atmospheric modeling.
- Contingency planning: Airlines and airports developed clearer protocols for future volcanic disruptions.
In short, a single Icelandic volcano permanently reshaped how the aviation industry manages volcanic risk.
Frequently Asked Questions
How do you pronounce Eyjafjallajokull?
It is roughly pronounced AY-yah-FYAT-lah-YOE-kootl. The Icelandic name breaks down into "island," "mountain," and "glacier," describing the ice cap that sits atop the volcano.
Why did the 2010 eruption stop air travel across Europe?
Magma melting the overlying glacier produced extremely fine, glassy ash that could damage jet engines. Prevailing winds carried this ash directly over Europe's busiest flight paths, forcing a six-day shutdown of airspace and the cancellation of around 100,000 flights.
Is Eyjafjallajokull still active today?
Yes. The volcano is dormant but not extinct, and Iceland's intense tectonic and hotspot activity means future eruptions are possible. It is monitored continuously, as is its larger and more dangerous neighbor, Katla.
Where exactly is Eyjafjallajokull located?
It lies in southern Iceland, about 125 kilometers southeast of the capital Reykjavik and just inland from the Atlantic coast, near the Skogafoss and Seljalandsfoss waterfalls along the Ring Road.