In July 1831, a volcanic eruption beneath the Sicilian Channel created a new island on Graham Bank. The sudden emergence of land sparked a territorial dispute among several European powers, including Britain, Naples, France, and Spain. On September 29, 1831, a French geologist named Constant Prévost raised the French tricolor on the island, which he named Julia in honor of the month it was formed and possibly in reference to France’s July Monarchy. However, the island did not last long. By January 1832, it had been completely submerged by the sea due to erosion and winter storms.
The signs of the eruption were first noticed by people along the Sicilian coast, who reported tremors and a strong sulfur smell. On July 18, 1831, Commander Swinburne of the British ship Rapid observed a dark plume of smoke rising from the sea, which was later accompanied by flashes of fire. A few weeks later, this plume had solidified into a pile of rocks that formed the island. The British Navy viewed the island as a strategic location for monitoring Mediterranean shipping, closer to the European continent than their colony of Malta. British forces were the first to arrive, with Captain Humphrey Senhouse planting the Union Jack and naming the island Graham Island after Sir James Graham, a British naval official.
The Kingdom of Naples soon followed, sending the corvette Etna to the site. King Ferdinand II of the Two Sicilies claimed the island for himself, naming it Ferdinandea after his own name. Nobles of the Bourbon family had even considered building a seaside resort on the island, though it only existed for a few weeks. Spain reportedly also had territorial ambitions, though these claims are less well-documented. France, represented by Prévost, arrived last, raising the French flag in what he described as a gesture of scientific interest, though it also had diplomatic implications.
The island was composed of tephra, a type of loose volcanic material that could not withstand the sea’s forces. Naturalist Hoffmann, who visited the site in September 1831, noted that the island was shrinking daily and predicted its disappearance by winter. His prediction proved accurate: by January 1832, the island had vanished beneath the waves. Today, the top of the volcanic structure lies about 8 meters below the surface, too deep for any construction but close enough to pose a navigational hazard.
The volcano, known as Empedocles, is part of a group of underwater volcanic structures off Sicily. In the early 2000s, a marble plaque placed on the site was found broken, and a resurgence of seismic activity in 2002 reignited discussions about the island’s potential reemergence. While the island’s current location is within Italian territorial waters, between Sicily and Pantelleria, sources disagree on how many times it has appeared. Some suggest the 1831 event may not have been the last, leaving the possibility that the island could rise again in the future.
The Brief and Contested Emergence of an Underwater Volcanic Island in the Sicilian Channel
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