| Graham Island | |
| Depth: | Roughly 80NaN0 |
| Height: | 630NaN0 (maximum)[1] |
| Summit Area: | Campi Flegrei del Mar di Sicilia (Phlegraean Fields of the Sea of Sicily)[2] |
| Location: | Between Sicily and Tunisia |
| Coordinates: | 37.1667°N 55°W |
| Type: | Submarine volcano |
| Last Eruption: | 1863 |
Graham Island (also Graham Bank or Graham Shoal; Italian: Isola Ferdinandea; French: Île Julia) is a submarine volcano in the Mediterranean Sea near the island of Sicily that has, on more than one occasion, risen above the surface of the Mediterranean via volcanic action and soon thereafter been washed away. Since 300 BC this cycle of events has occurred four times.[3]
The top of the island is presently 6 metres below sea level. The island's most recent "appearance" occurred in July 1831, but then by January 1832 the portion of the island above sea level had been entirely washed away again by the wind and the waves of the Mediterranean Sea. The 1831 version of the island was first visited by the Sicilian customs official Michele Fiorini on 17 July 1831, who planted an oar there to claim the newly emerged island for the Kingdom of the Two Sicilies.[4]
On 2 August 1831 Humphrey Fleming Senhouse, the captain of the first rate Royal Navy ship of the line St Vincent named the island after Sir James Graham, the First Lord of the Admiralty, and claimed the island for the United Kingdom. In 1831, during the brief six-month lifespan of the island, a four-way dispute over the island's sovereignty arose, which was still unresolved when the island again disappeared beneath the waves in early 1832.
The island is a part of the underwater volcano Empedocles, 30km (20miles) south of Sicily, which is one of a number of submarine volcanoes known as the Campi Flegrei del Mar di Sicilia. Seamount eruptions have raised it above sea level several times before erosion submerged it again.
During its brief life in 1831, French geologist Constant Prévost was on hand, accompanied by an artist, to witness it in July; he named it Île Julia, for its July appearance, and reported in the Bulletin de la Société Géologique de France. Some observers at the time wondered if a chain of mountains would spring up, linking Sicily to Tunisia and thus upsetting the geopolitics of the region.[5] It showed signs of volcanic activity in 2000 and 2002, forecasting a possible appearance; however, it remains 6m (20feet) under sea level.
Volcanic activity at Graham Island was first recorded during the First Punic War during the 3rd century BC. The island is believed to have appeared and disappeared four or five times since then.[6] Several eruptions have been reported since the 17th century AD.[7] The island is located in a volcanic area known as the Campi Flegrei del Mar di Sicilia (Phlegraean Fields of the Sea of Sicily), in between Sicily and Tunisia in the Mediterranean Sea. Many submarine volcanoes (seamounts) exist in the region, as well as some volcanic islands such as Pantelleria.
Graham Island's most recent appearance as an island was in July 1831.[8] The first reports of high seismic activity and/or eruptions occurred during a period spanning from 28 June to 10 July 1831. These reports came from the nearby town of Sciacca.[1] On 28 June, the Royal Navy ships and were shaken by an earthquake between Sciacca and Pantelleria.[9] On 4 July an odour of sulfur spread through the town reportedly in such quantities that it blackened silver.[1] On 12 July, Ferdinando Caronna, captain of the Psyche from Naples, reported seeing smoke coming out of the sea.[9] On 13 July, a column of smoke was clearly seen from St. Domenico. The residents believed it to be a ferry on fire.[1] On the same day, the brig Gustavo passed through the area, confirming a bubbling in the sea that the captain thought was a sea monster. Another ship reported dead fish floating in the water.[9]
By 17 July, a fully grown islet had formed enough to where Sicilian customs official Michele Fiorini was able to land there and to claim the island for the Kingdom of Sicily. The eruptions of 1831 resulted in the island increasing in size to about (4disp=output onlyNaNdisp=output only). At its maximum (in July and August 1831), it was 4800m (15,700feet) in circumference and 63m (207feet) in height. It sported two small lakes, the larger of which was in circumference and 2m (07feet) in depth.[1]
In the months ahead, Graham Island eventually became the subject of a four-way dispute over its sovereignty. In August 1831, the volcano had risen above sea level. On 2 August 1831, Humphrey Fleming Senhouse, the captain of the first rate Royal Navy ship of the line HMS St Vincent claimed the island for the British Crown and named it after Sir James Graham, the First Lord of the Admiralty, and planted their flag, the Union Jack. Although still only a couple of rocks, the Royal Navy thought it was very suitable as a base to control the traffic in the Mediterranean, as it was closer to the European continent than the island of Malta, a Crown Colony.[1]
The King of the Two Sicilies also realized its strategic significance, and dispatched the corvette Etna to claim the new land and dub it Ferdinandea in honour of King Ferdinand II. Spain also declared its territorial ambitions.[10] Last on the scene was Constant Prévost, a co-founder of the French Geological Society, who compared the eruption to a bottle of champagne being uncorked. He named the island Julia, because it was born in July, and probably also in reference to France's July Monarchy. Diplomatic disputes over the island's status ensued.[9]
During the island's brief lifespan tourists began to travel to the island to see its two small lakes. Sailors watched it when passing by, and nobles of the House of Bourbon reportedly planned to set up a holiday resort on its beaches.[11] None of these ideas came to fruition, however, as the island soon sank back beneath the waters. The island was composed of loose tephra, easily eroded by wave action, and when the eruptive episode ended it rapidly subsided, disappearing beneath the waves in January 1832, before the issue of its sovereignty could be resolved. Fresh eruptions in 1863 caused the island to reappear briefly before again sinking below sea level.[1] By 17 December 1831, officials reported no trace of it. As dynamically as the seamount appeared, it disappeared, defusing the conflict with it.[12]
After 1863, the volcano lay dormant for many decades, its summit just 8m (26feet) below sea level.In 2000, renewed seismic activity around Graham Island led volcanologists to speculate that a new eruptive episode could be imminent, and the seamount might once again become an island.[13] In November 2002 the Institute of Geophysics and Volcanology in Rome observed minor seismic activity and gas emissions.[12] They put the time of resurfacing at a couple of weeks or months. Italian sailors put an Italian flag on the top of the bank to avoid other nations' claims if the former island resurfaced. Despite showing signs in both 2000 and 2002, the seismicity did not lead to volcanic eruptions and Graham's summit remains about below sea level.[14]
To forestall a renewal of the sovereignty disputes, in November 2000 Italian divers planted a Sicilian flag on the top of the volcano in advance of its expected resurfacing.[12] In a ceremony attended by Prince Carlo, Duke of Castro (a descendent of Ferdinand II) and his wife Princess Camilla, a marble plaque was lowered into the water, with Prince Carlo proclaiming that the island "will always be Sicilian".[13]
The marble plaque, weighing 150kg (330lb), was inscribed "This piece of land, once Ferdinandea, belonged and shall always belong to the Sicilian people." Within six months, it had fractured into twelve pieces.[15]
The sudden geologic phenomenon was observed and studied by numerous scientists. Among the Germans were Hoffmann, Schultz, and Philippi. Among the English were Edward Davy and Warington Wilkinson Smyth.[15] Among the French was Constant Prévost, who visited the island with an artist, and presented his findings in the Bulletin de la Société Géologique de France.[16] Among the Italians was Scinà Domenico (1765–1837) who published his observations in the "Effeméridi Sicilians" (1832, vol. 2), and Carlo Gemmellaro (1787–1866), teacher of geology and mineralogy at Catania University, who published "Actions of the Gioenia Academy of Catania" (1831, vol.8).[1]
In 2006, further study revealed Graham Island to be just one part of the larger volcanic cone Empedocles.
The island is still referenced on marine charts, as its top is only 6m (20feet) short of breaking the surface, it thus becomes a potentially dangerous hidden obstacle for many seafaring vessels whose keels most often run deeper than this. It is also a small shoal on which near-surface maritime creatures dwell.
In August 1831, observers around the world reported a discolored sun in the sky, tinted blue, purple, or green. Researchers have attempted to discover what volcanic activity was responsible for the stratospheric discharge that caused the discoloration, with an early consensus that Babuyan Claro in the Philippines was the most likely source. But later research has concluded there was no 1831 eruption at Babuyan Claro,[17] and some have argued the smaller activity at Graham was the likely culprit.[18]
Whatever caused the 1831 discoloration is historically significant in the United States, because Nat Turner, an enslaved preacher in Southampton County, Virginia, took the bluish-green sun as a divine sign to begin what became known as Nat Turner's slave rebellion, which ended with the deaths of more than 200 people and led to new laws across the South further restricting the liberties of slaves, including banning their education and limiting their religious freedom.[19]
A number of Cinderella stamps and art coins have been issued over the years, under fictional names such as Poste Isola Ferdinandea.[20]
In 2000, an unofficial minting of a penny was produced by a Sicilian artist, featuring the former island on one side and, unusually, a bust of Elizabeth II on the other. David Mannucci, the designer of the coin, had the idea to produce it after he "found out the existence of the ghost island" from a newspaper article. Besides the copper piece, he minted varieties in silver, copper "with protective enamel", and in silver "with protective enamel". While this Italian-made coin fittingly bears the Italian name for the former island, the art coin also features a bust of "Elizabeth II D.G.R." and bears a British denomination.[21]
During its emergence it was visited by Sir Walter Scott, and it provided inspiration for James Fenimore Cooper's The Crater, or Vulcan's Peak, Alexandre Dumas, père's The Speronara, Jules Verne's Captain Antifer and The Survivors of the Chancellor and Terry Pratchett's Jingo. The island was also the subject of an episode of Citation Needed, a panel show made and hosted by British content creator Tom Scott.