The remote South Atlantic island of Tristan da Cunha (hereafter abbreviated to “Tristan”) is a large oceanic shield volcano rising more than 5,500 m from the sea floor to an altitude of 2,060 m above sea level. Tristan along with the islands Inaccessible and Nightingale and a number of smaller islets forms the Tristan da Cunha group (figure 1), which lies on a submarine plateau approximately 200 km east of the Mid-Atlantic Ridge near its junction with the Walvis Ridge (Morgan 1971; Fairhead and Wilson 2005). The group is believed to represent the surface volcanic...

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