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American Samoa has no history of production and no exploration wells have ever been drilled on land or in its surrounding waters. Globalshift does not forecast any future production of oil or gas from the country.
For recent events see News Briefs.
The main island of Tutuilla and the 3-island Manu’a group are volcanic while Swains island and Rose Atoll are coral reefs, all within oceanic crust of the Pacific tectonic plate.
The Samoan volcanic island chain probably arose as the Pacific tectonic plate moved from east to west over a mantle plume known as the Samoa hotspot. The volcanic islands and seamounts further away from the Samoa hotspot should be progressively older however, Savai'i, the most western of the Samoan islands (part of the country of Samoa), erupted relatively recently.
The Tonga Trench lies just to the south of the island group and it is possible that the volcanoes have a mixed origin associated with both the hotspot and the subduction event along this collision boundary.
In any case the geology precludes oil and gas and Globalshift regards American Samoa to have no potential onshore and offshore.