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The two main islands and surrounding islets of Samoa are volcanic 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 island of Samoa, erupted only recently with the last eruption occurring in 1911.
The Tonga Trench lies just to the south of the island group and it is possible that the volcanoes have a mixed origin associated both with the hotspot and with active subduction along this collision boundary.
Consequently Globalshift regards Samoa as having no oil and gas potential onshore and offshore.