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One of the World’s Most Active Volcanoes is Falling Into the Sea

Aerial Views Of Volcano Mount EtnaAerial Views Of Volcano Mount Etna
The summit craters of Etna volcano seen from the helicopter of the Italian Coast Guard in Catania, Italy.Fabrizio Villa—Getty Images

Sicilians have long kept a wary eye on Mt. Etna, Europe’s most active volcano, but the big threat these days isn’t magma. It’s gravity.

Scientists report Mt. Etna is slowly falling into the sea, which could result in massive tsunamis that could put parts of Greece and perhaps Turkey and other Mediterranean countries at risk.

The GEOMAR Helmholtz Center for Ocean Research in Kiel, Germany, led the study, which placed underwater sensors at the base of the volcano to get a sense of its movement. The study found that rather than moving the typical 2 to 3 centimeters per year, Mr. Etna had moved 4 centimeters in eight days.

“Etna’s flank movement poses a much greater hazard than previously thought,” the report read, noting that the risk of collapse might be underestimated at other volcanoes as well.

Rising magma is usually to blame for sudden shifts in a volcano’s position, but the study said the current movement was happening far from magma sources.

Both the Kiel team and another scientist who studied their work say the increased pace of movement is worrisome, but neither believes any catastrophic event will happen soon. Both, though, are encouraging additional studies.

Mt Etna’s slow disappearance comes just months after Hawaii’s Kilauea concluded a prolonged eruption, forming a new island in Hawaii, destroying homes and evaporating the Big Island’s largest lake.