Bonin Islands Pacific Plate is subducting under the Philippine Sea Plate, which creates an oceanic trench to the east of the islands: the Bonin Trench. The crust of the Ogasawara Islands was formed by volcanic activity when subduction began 45–50 million years ago, and is composed mostly of an andesitic volcanic rock called boninite, which is rich in magnesium oxide, chromium, and silicon dioxide. The Ogasawara Islands may represent the exposed parts of an ophiolite that has not yet been emplaced on oceanic crust. The rocks of the Volcano Islands are much younger; Iwo Jima is a dormant volcano characterized by rapid
Unnamed volcano (Ibugos) Unnamed volcano (Ibugos) Unnamed volcano (Ibugos), is a submarine volcano near the island Ibugos in the Philippines. The volcano is off Ibugos Island, at the southernmost end 0f the Batanes Islands, in the province of Batanes, in the Cagayan Valley Region, in the Philippines, within the Luzon Strait between Luzon and Taiwan. The volcano is a submarine volcano rising to within of the sea surface, due west of Dequey Volcano. It is one of the active volcanoes in the Philippines. Submarine eruptions reported in 1773, 1850, and 1854 are likely to have originated from this volcano. There have been no